high-temperature thermocouples - automaatika temperature thermoc.pdfkanthal is registered trade mark...

Product Data Sheet00813-0601-2654

Rev. 1, October 1999

High-TemperatureThermocouples

2

Section 1: IntroductionOverview .............................................................................................................................................. 4

Section 2: Thermocouples – Technical ReferencesThermoelectric Effect .......................................................................................................................... 5Thermocouple Materials ..................................................................................................................... 5Limit Tolerances .................................................................................................................................. 6Important Reasons for a Change in the Thermoelectric Voltage during Operation ....................... 6Change in the Thermoelectric Voltage due to Interdiffusion ............................................................ 6Change in the Thermoelectric Voltage by Selective Evaporation .................................................... 6Change in the Thermoelectric Voltage due to Environmental Influences ...................................... 7Uncertainty due to Electrical Interference ........................................................................................ 7Important Information about Installation of High-Temperature Thermocouples ......................... 7

Section 3: Standard-Application ThermocouplesIntroduction ........................................................................................................................................ 8Series 1075 Immersion Thermocouples, Type BM – with Metal Protective Tube andwithout Ceramic Inner Tube (Max. Temperature 1200 OC) .............................................................. 12Series 1075 Immersion Thermocouples, Type AM(K) – with Metal Protective Tube andwith/without Ceramic Inner Tube (Max. Temperature 1700 OC) ..................................................... 14Series 1075 Immersion Thermocouples, Type AKK – with Ceramic Protective Tube andCeramic Inner Tube (max. Temperature 1800 OC) ........................................................................... 17Series 1075 Immersion Thermocouples, Type BK – with Ceramic Protective Tube andwithout Ceramic Inner Tube (max. Temperature 1800 OC) .............................................................. 20Series 1075 Immersion Thermocouples, Type AK – with Ceramic Protective Tube andwithout Ceramic Inner Tube (max. Temperature 1800 OC) ............................................................. 22Price Calculation of Precious Metals ................................................................................................. 24

Section 4: Thermocouples for Glass IndustryIntroduction ........................................................................................................................................ 25Thermocouples with Platinum Protective Tubes .............................................................................. 26Multipoint Thermocouples ................................................................................................................. 30Thermocouples with Electrical Shielding ......................................................................................... 34Glass-Level Electrodes ....................................................................................................................... 37

Section 5: Calibration and CertificatesTests and Measurements on Thermocouples .................................................................................... 41Calibration with DKD-Certificate ..................................................................................................... 42Works Certificates .............................................................................................................................. 43

Section 6: AccessoriesTransmitters ....................................................................................................................................... 47Connection Heads ............................................................................................................................... 48Mounting Accessories ......................................................................................................................... 50Thermocouple Wires, Extension and Compensating Cables ........................................................... 51

Thermocouple Questionnaire ............................................................................................. 53

Colour Coding Table for Extension and Compensating Cables ....................... 55

Contents

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SectionIntroduction1

Section 6AccessoriesIncludes descriptions, specifications, and order-ing information on transmitters, connectionheads, mounting accessories, thermocouplewires, extension and compensating cables.

Thermocouple Questionnaire

Colour Coding Table for Extensionand Compensating CablesColour coding table according to differentstandards.

For further information regarding this datasheet, please contact the application depart-ment of one of the following companies:

Fisher-Rosemount LimitedHeath PlaceBognor RegisWest Sussex PO22 9SHU.K.Phone: +44(1243) 863-121Fax: +44(1243) 867 5541Internet: www.rosemount.com

www.fisher-rosemount.de/hsg

Heraeus Sensor GmbHRosemount Heraeus SensorFrankenstr. 2163791 Karlstein-DettingenGermanyPhone: +49 (6188) 992-0Fax: +49 (6188) 992-286

Fisher-Rosemount Temperature BVDe Langkamp 3bNL-3961 MR Wijk bij DuurstedeNetherlandsPhone: +31 (343) 596-363Fax: +31 (343) 596-345

Section 1IntroductionThis product data sheet is intended to be acomplete reference and ordering guide of ther-mocouples and accessories for technical meas-urements mainly at high temperatures andtheir specific applications in a temperaturerange between 600 °C and 1800 °C.

Section 2Thermocouples – Technical Refer-encesDescribes the basic concepts of temperaturemeasurement with thermocouples. Includesinformation on limit tolerances and applica-tion specific changes in the thermoelectricvoltage and, in addition, important notes forinstallation of high temperature thermo-couples.

Section 3Standard-Application Thermo-couplesIncludes descriptions, specifications, and or-dering information on Series 1075 Thermocou-ples with different protective tube designs.

Section 4Thermocouples for Glass IndustryIncludes descriptions, specifications, and or-dering information on glass industry applica-tions.

Section 5Calibration and CertificatesIncludes a description of tests and measure-ments of thermocouples, a performance over-view of the DKD-calibration laboratory, andtest specifications of calibrated Series 1075Thermocouples.

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Introduction

OverviewThe acquisition of Heraeus Sensor by theFisher-Rosemount Group in 1997 significantlyimproves our ability to supply a comprehensiverange of standard and customer specifiedproducts for temperature measurement.This Product Data Sheet (PDS), entitled”High-Temperature Thermocouples”, containsstandard thermocouples which conform to theGerman DIN standards and special thermo-couples for applications in glass industry.

In addition to the products in this data sheet,Rosemount offers a wide range of other prod-ucts for high-temperature measurements.Protective tubes made of special materials– such as Kanthal, silicon carbide, Stellite,tantalum, titanium, Hastelloy-alloys, Moneletc. – allow the use in different fields of appli-cation, e.g. ceramic, steel, and chemical indus-try as well as mining.

Beyond that, Rosemount provides a specialthermocouple for high-pressure and high-tem-perature applications. For one particular pro-duction-scale gas reactor, operating at a tem-perature of 1400 °C and a pressure of 65 bars,Rosemount Heraeus Sensor developed an insu-lated thermocouple enclosed in a special cap-sule in order to protect it from corrosive gases.For this thermocouple-type we have a patent.

Series 1075 Thermocouples conform to the re-quirements of the DIN EN 60584-1/2 (IEC 584)standards. The DIN 43772 and DIN 43733standards define all protective tube designs.Rosemount´s high-temperature thermocouplesare manufactured of material of excellentquality. The state-of-the-art manufacturingprocess enables the use of the thermocouples invery different fields of application, amongother things the monitoring and control ofprocess temperatures up to 1800 °C.

High-temperature measurement requires aspecialised knowledge. On the basis of our100-years’ experience of innovation and ap-plication of thermometers, we offer a completerange of highly accurate temperature meas-uring solutions for process control.

It is our primary concern to steadily extendthe service life of our products in operation bya continuous information exchange with thecustomer and to take up the resultant im-provements in our research and developmentdepartment.

Our DKD-authorized calibration laboratorycertifies thermocouples and resistance thermo-meters on the basis of comparative and fixed-point measurements according to the regula-tions of the German Calibration Service. Thisenables the calibration and certification ofevery sensor for our customers.As the DIN EN/ISO 9000 standards set growingrequirements on a company’s quality assurancesystem, the documented supervision of testequipment is becoming increasingly an issueof international competitiveness.

Rosemount and the Rosemount logo are registered trade marks ofRosemount Inc.Inconel und Monel are registered trade marks of International Nickel Co.Hastelloy is registered trade mark of Cabot Corp.Kanthal is registered trade mark of Kanthal Sweden.Stellite is registered trade name of Deloro Stellite (UK Ltd.).

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Thermoelectric EffectA thermocouple consists of a connection of twodifferent metals which produces a change ofthe thermoelectric EMF in comparison with atemperature change. A thermocouple providesa thermoelectric voltage in millivolts d.c.which depends on the temperature differencebetween the hot and cold junctions.The hot junction is that junction which is ex-posed to the temperature of measurement.The cold junction is the one for which the tem-perature is known. A thermocouple consists oftwo connected different leads, called positiveor negative leg. In practice, these leads areconnected to extension or compensating cable,or directly to the transmitter in the local con-nection head. The simplest practicable thermo-couple consists of two wires welded togetherat one end, which forms the measuring tip.

Thermocouple MaterialsThe DIN EN 60584 (IEC 584) standards de-fine the basic values and tolerances of thethermocouple types at a temperature rangebetween 0 °C and 1800 °C. High-temperaturemeasurements of 1200 °C up to 1800 °C canbe carried out with precious-metal thermo-couples only. Generally, precious-metal (plati-num) thermocouples are the most stable. Incomparison with base-metal types, they can beused up to 1800 °C, although their electricaloutputs are low (see Table 1). Type K is acommonly used base-metal thermocouple andcovers most industrial applications.

Rosemount transmitters are programmablefor the majority of thermocouple inputs. Thethermoelectric voltage is amplified and, for ex-ample, converted into a 4 - 20 mA output sig-nal in proportion to temperature.

SectionThermo couples – Tec hnical References2

Table 1: Characteristics of standard thermocouples.

Thermocouple Type Alloy of Leads +/- Temperature Range [°C] Output [mV d.c.]

J Fe-CuNi 0 to 700 0 to 39.130K NiCr-Ni 0 to 1200 0 to 48.828R PtRh87/13%-Pt 0 to 1600 0 to 18.842S PtRh90/10%-Pt 0 to 1600 0 to 16.771B PtRh70/30%-PtRh94/6% 0 to 1800 0 to 13.585

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Thermo couples – Technical Ref erences

Limit TolerancesAll thermocouples manufactured and suppliedby Rosemount are in accordance with theDIN EN 60584-2 (IEC 584-2) limit tolerances.Calibration of one or more customer-specificmeasuring points can be provided on requestwith a DKD-certificate up to 1200 °C and aworks certificate up to 1300 °C.

Important Reasons for a Change inthe Thermoelectric Voltage duringOperationAbove 1200 °C, precious-metal thermocouplesare stable because of their excellent oxidationand corrosion resistance. Thermocouplesbased on platinum (type R, S, and B) are byfar the most common. However, even PtRhthermocouples cannot guarantee reliable tem-perature measurement, for a longer periodand without careful control. This may causeconsiderable measuring errors or even earlyfailure. The thermoelectric voltage of precious-metal thermocouples can change due to envi-ronmental influences outside the protectivetube. Above 1300 °C, in oxidizing and reducingatmospheres, impurities (mainly iron) of theprotective tubes result in faulty measure-ments.If thermocouples are used in reducing atmos-pheres, even a small amount of silicon causesrapid embrittlement and, therefore, a changein the thermoelectric voltage. Gas-tight alu-mina protection tubes are to be used for theseapplications. A complete range of Rosemounthigh-temperature thermocouples are availablewith 99.7% recrystalised alumina protectivetubes to avoid early deterioration of the ther-mocouple wires.

Change in the Thermoelectric Volt-age due to InterdiffusionThe thermoelectric voltage (EMF) between amaterial and a reference element depends onthe composition of the thermocouple wires. Asprecious-metal thermocouples are generallyused in a temperature range where solid statereactions and diffusion processes may occuron a large scale, a constant composition of thethermocouple wires cannot be guaranteed.One of the reasons for instability is an inter-diffusion at the hot junction. Interdiffusion viagas phase is largely avoided by using high-purity alumina ceramic insulators in all high-temperature thermocouple assemblies.

Change in the Thermoelectric Volt-age by Selective EvaporationDifferent bonding energies and thus differentevaporation rates of the alloying elements of awire change the concentration during opera-tion. The evaporation rate in a reducing atmos-phere is lower than in an oxidizing atmosphere.Rh evaporation in a PtRh wire may cause con-siderable measuring errors if the other leg isPt on a PtRh-Pt thermocouple. Therefore, theuse of a thermocouple with a PtRh alloy inboth legs (type B) is recommended in order tohave a more stable signal for a longer period(Rh evaporation in both legs).The rhodium diffusion at the measuring tip isbased on the affinity of pure platinum for con-tamination and alloy components. The unal-loyed platinum wire extracts rhodium fromthe alloyed wire. The microstructural changeon both sides of the measuring tip causesmeasuring errors. For this reason, the use oftype B-thermocouples is recommended as bothlegs contain rhodium parts. The long-term sta-bility of the platinum-rhodium thermocouplesincreases with a growing rhodium content.

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Thermo couples – Technical Ref erences

Uncertainty due to Electrical Inter-ferenceThe thermocouple output can be influenced byelectromagnetic radiation, e.g. in electricallyheated furnaces. Depending on the strength ofthe electrical field, serious reading errors mayoccur. Normally, shielded compensating cablesare used to lead the output signal to the con-trol room. In practice however, this measure isnot sufficient to avoid all possible signal distur-bances. Rosemount offers special, electricallyshielded high-temperature thermocouples upto 1800 °C, supplied with gas-tight, ceramicprotective tubes.

Important Information about Instal-lation of High-Temperature Thermo-couplesTo reduce any risk of damage of gas-tight, cer-amic protective tubes by thermal shock, it isnecessary to pre-heat the thermocouple as-sembly before installation. Slow insertion intothe ceramic protective tubes avoids possibledamaging, caused by rapid changes in tem-perature. At high temperatures, it is recom-mended to assemble thermocouples vertically,so that distortion or breakage is prevented.Even hair-line cracks may cause contamina-tion and drifts at thermocouples. To avoidbending or breakage, horizontally assembledthermocouples are to be supported.Furthermore, it has to be taken into consider-ation that the temperature at the connectionhead and the terminal block must not exceed200 °C.

Change in the Thermoelectric Volt-age due to Environmental InfluencesThe most important effect in practice is theinfluence of the environment, which has beenintensively investigated. Diffusion by impuri-ties in thermocouple wires changes their ther-moelectric output, or even destroys them. Athigh temperatures and reducing atmospheres,the release of arsenic, silicon, phosphorus,sulphur and boron is very dangerous becausethey form eutectic phases which lead to a totalfailure.For this reason, all Rosemount high-temper-ature thermocouples are protected by high-quality ceramic closed end tubes. In all ourmanufacturing areas, special care is taken toavoid any contamination with oil, grease, sul-phur, and metallic impurities which eventuallycause serious errors during operation.

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SectionStandard-Application Thermocouples3

Table 2: Limit tolerances of thermocouples.

IntroductionThe Series 1075 thermocouples conform toDIN 43772 and 43733 standards, and can beordered as complete thermocouple assemblies.The model number from the respective order-ing table defines the thermocouple type, mate-rial, nominal length, process connection, pro-tective tube and connection head.

The limit tolerances of thermocouples acc. toDIN EN 60584-2 standards are the defined byvalues in °C or the percentages referred to theactual temperatures in °C.

Type Alloy Standard Temperature Range Limit Tolerance Tolerance[°C] DIN EN 60584-2 Class

Base-Metal Thermocouples

J Fe-CuNi DIN EN 60584-1 -40 °C to 375 °C 1.5 °C 1375 °C to 750 °C 0.004 x (t)-40 °C to 333 °C 2.5 °C 2333 °C to 750 °C 0.0075 x (t)

K NiCr-Ni DIN EN 60584-1 -40 °C to 375 °C 1.5 °C 1375 °C to 1000 °C 0.004 x (t) -40 °C to 333 °C 2.5 °C 2333 °C to 1200 °C 0.0075 x (t)

N NiCrSi-NiSi DIN EN 60584-1 -40 °C to 375 °C 1.5 °C 1375 °C to 1000 °C 0.004 x (t) -40 °C to 333 °C 2.5 °C 2333 °C to 1200 °C 0.0075 x (t)

L Fe-CuNi 1) -40 °C to 400 °C 3 °C400 °C to 750 °C 0.0075 x (t)

Precious-Metal Thermocouples

R PtRh87/13%-Pt DIN EN 60584-1 0 °C to 1100 °C 1 °C 11100 °C to 1600 °C [1+0.003 x (t-1100 °C)]

0 °C to 600 °C 1.5 °C 2600 °C to 1600 °C 0.0025 x (t)

S PtRh90/10%-Pt DIN EN 60584-1 0 °C to 1100 °C 1 °C 11100 °C to 1600 °C [1+0.003 x (t-1100°C)]

0 °C to 600 °C 1.5 °C 2600 °C to 1600 °C 0.0025 x (t)

B PtRh70/30%-PtRh94/6% DIN EN 60584-1 600 °C to 1700 °C 0.0025 x (t) 2

1) DIN 43710 has been cancelled and replaced by a works standard.

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Table 3: Recommended thermocouple wire diameter depending on the application temperature.

Standard-Application Thermocouples

Thermocouple Thermocouple Wire DiameterType 0.35 mm 0.5 mm 0.8 mm 1 mm 1.38 mm 2 mm 3 mmJ / L 400 °C 400 °C 600 °C 600 °C 700 °C 700 °CK / N 700 °C 800 °C 800 °C 1000 °C 1200 °C 1200 °CR / S 1400 °C 1600 °C

B 1500 °C 1800 °C

Rosemount provides thermocouples of toler-ance class 1 (except types L and B). In thisproduct data sheet, types K, R, S, and B aredefined as standard thermocouple types. Allother types are available on request.Type L, according to the works standard, canbe supplied for the spare-part demand of olderplants.

The thermocouple wire diameter varies in thedesign of the thermocouple. The standard dia-meter for precious-metal thermocouples is0.5 mm for long-term stability. Other thermo-couple wire diameters are available on re-quest. The price of precious metals is subjectto daily quotation and, therefore, it will bequoted separately. Please see correspondingadditional clause at the end of this section.

Thermocouples have to be protected frompressure, flow, corrosion and other mechanicaland chemical influences. A protective tube isused to resist these influences permanently.The selection of a suitable protective tube isthe crucial factor for the actual service life ofthe thermocouple assembly. A multiplicity ofproven designs of different materials and al-loys was standardized for the use of our ther-mocouple assemblies. Depending on the proc-ess conditions, we offer a wide range of appli-cation-specific protective tubes.

Metal protective tubes of heat-resistant ma-terials, such as Inconel or CrNi-steel, providethe advantages of high-mechanical stress andcan be used at temperatures up to 1200 °C. Asstandard design, we offer protective tubes offollowing materials: AISI 446 (1,4762) andAISI 314 (1,4841). Protective tubes of KanthalAF and Kanthal Super are suitable for temper-atures of 1350 °C or 1700 °C, e.g. in corrosivefurnace atmospheres. Particularly in refuseincinerators, the Kanthal protective tubes findmultiple application.

Ceramic protective tubes are predominantlyused for high-temperature ranges. Table 4shows the characteristics and fields of appli-cation for standard materials and ceramictypes C 530, C 610 and C 799.

Gas-tight protective tubes, made of silicon car-bide for use in high dust loads and corrosiveenvironments up to 1400 °C, are available onrequest. Special characteristics of reaction-sintered, silicon-infiltrated silicon-carbide pro-tective tubes guarantee high service lives underextreme operating conditions.

If protective tubes in this data sheet seem tobe unsuitable for special applications, pleaseprovide us with exact information on the oper-ating conditions, so that an appropriate offercan be submitted.

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Table 4: Characteristics and types of application for metallic and ceramical protective tubes.

Material Max. Particularly Suitable Less Suitable Field of ApplicationTemperature

Metal Protective Tubes

1.0305 (St 35.8)

1.0305 enamelled(St 35.8 enamelled)

1.4762

1.4749

Kanthal AFTM

1.4767

Kanthal SuperTM

(Molybdenum Disilicide)

1.4841

600 °C

600 °C

1200 °C

1200 °C

1350 °C

1700 °C

1200 °C

For air, average resistanceto nitrogenous gases

For corrosive applicationswithin the dew-point rangeof flue gasesHigh resistance tosulphurous gases

Very high resistance tosulphurous gasesHigh heat resistance, highresistance to sulphurousgases, high abrasionresistanceVery high heat resistance,high resistance to corrosion,high thermal conductivity,excellent hardness character-istics, high abrasion resist-anceHigh resistance tonitrogenous andlow-oxygen gases

Poor resistance tosulphurous gases

Sensitive to shock,inflexibility

Poor resistance tonitrogenous gases

Poor resistance tonitrogenous gasesPoor resistance tonitrogenous gases

Poor resistance tonitrogenous gases

Poor resistance tosulphurous gases

Temperature furnaces forthermal treatment processes,galvanisation and tinning plants,carbon-dust-air mixture pipe-lines in steam power stationsFlue-gas desulphurisationplants,bearing metal, lead andtin meltsCombustion exhausts, cementand ceramic furnaces, thermaltreatment processes, annealingfurnacesFlue ducts, cooling furnaces

Industrial furnaces, glass,ceramic and cement industry,refuse incinerators

Glass and ceramic industry,carbon pressure-gasification,refuse incinerators

Combustion chambers, industrialfurnaces, petrochemical industry,nitrogenous blast heaters,cyanide baths

Type C 530(Al2O3 Content: 73 - 75%)

Type C 610(Al2O3 Content: 60%)

Type C 799(Al2O3 Content: 99.7%)

Silicon-Infiltrated,Reaction Sintered,

Silicon Carbide(e.g. HalsicTM, ProtecTM,

Silit SKTM)

1600 °C

1400 °C

1800 °C

1400 °C

Resistant to thermal shocks

Gas-tight, high refractoryquality, average resistanceto thermal shocksVery gas-tight, highestrefractory quality, resistant toacids, alkalines and hotsteam, high flexibility

Very high consistency,extremely high corrosionresistance to acids andalkalines, excellent thermalconductivity, very resistantto thermal shocks, highabrasion resistance

Fine pored, not gas-tight,sensitive to shock

Low Al2O3-purity, sensitiveto shock

Poor resistance to thermalshocks, sensitive to shock

Low mechanical stress

Electrically heated furnaces upto 1300 °C and other industrialfurnaces, glass tank furnaces,regenerator checkerworkGas-tight furnaces, diffusionfurnaces

Protective gas furnaces as wellas gas-tight and electricallyheated furnaces up to 1700 °C(glass tank furnaces), flue-gasdesulphurisation, chemicalindustry, cement productionFlue-gas desulphurisationplants, carbon mills, combustionchambers, flue-gas channels (incorrosive environment and athigh temperatures)

High-temperature thermocouples are used fortechnical temperature measurements in heattreatment and combustion processes, and hot-gas environments of glass, ceramic, and metalindustry.

The most frequent fields of application aretemperature monitoring and control of incin-erators, industrial furnaces, and reactors.

Ceramic Protective Tubes acc. to DIN VDE 0335 Standards (except Silicon Carbide)

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Usually, the ceramic protective tube is cementedinto a holding tube, for easy installation of theconnection head. As the temperature above thefitting is generally low, unalloyed steel is usedfor holding tubes. If the holding tube reachesinto the body of the furnace, heat resistantsteel is to be used.

Several connection head versions are availa-ble, which differ in sizes and type of covers. Allconnection heads have a rubber o-ring-seal onthe cable entry, which limits the permissibletemperature at this point to about 80 °C. If,instead of rubber, a silicone o-ring-seal is used,the max. temperature at the aluminium-alloyconnection heads is 200 °C. You will find suit-able connection heads in Section 6.

Besides our standard connection heads withinserted terminal block, the thermocouples ofthis product data sheet are also available withhead-mounted transmitters of series 244 and644.

It is recommended to insert these transmittersinto the cover of the connection head TZ-A/BLor TZ-/AL. The permissible temperature at theconnection head is reduced to 70 °C. You willfind a summary of all available transmittersin Section 6.

The process connections are mainly suppliedwith adjustable and removable mounting ele-ments, which are sealed with a stuffing bush.As standard, we offer adjustable stop flangesand threaded fittings in appropriate sizes. Theprocess connection at the metal protective tubesis freely movable. The mounting element of cer-amic protective tubes with stop and counterflange is situated at the end of the holdingtube with a seal on the protective tube. The po-sition of the threaded fitting or welded-onflange on the holding tube can be selected asdesired. To avoid gas penetration into the con-nection head after breakage of the protectivetube, the connection head is to be sealed.For further details see Section 6.

Table 5: Summary of material standards.

Material No. Material Code AISI B.S. AFNOR NF Product GroupDIN (USA) (Great Britain) (France)

1.0305 St. 35.8 Carbon steels1.4749 X 18 CrN 28 446 Heat-resistant steels1.4762 X 10 CrAl 24 446 Z 10 CAS 24 Heat-resistant steels1.4767 CrAl 20 5 (Kanthal AFTM) Heat-resistant steels1.4841 X 15CrNiSi 25 20 314 314 S 25 Z 12 CNS 25-20 Heat-resistant steels

Super KanthalTM Molybdenum disilicide Sintered metals

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Series 1075 Immersion Thermo-couples, Type BM – with Metal Pro-tective Tube and without CeramicInner Tube (Max. Temperature 1200 °C)

This design consists of a ceramic-insulatedthermocouple and a housing with a protectivetube, type BM according to DIN 43733 (form 1in accordance with DIN 43772).

The single or double thermocouple legs are in-sulated with ceramic elements. Oxygen-poor,neutral and reducing atmospheres, particu-larly in conjunction with humidity or carbonmonoxide, can produce “selective chrome oxi-dation “ at temperatures between 800 °C and1000 °C.

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Figure 2: Immersion thermocouples Series 1075,type BM.

Figure 3: Dimensional drawing - Type BM.

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This process changes the EMF of the thermo-couple (type K). If the operating temperatureis constantly within this range, we recommendthe use of a mineral-insulated thermocouple.

For gas-tight installation of the protectivetube, a gas-tight threaded fitting is necessary(pressure load up to max. 1 bar). The standardheat resistant materials for protective tubesare 1.4762 and 1.4841. Protective tubes of ma-terial 1.4762 have a longitudinal weld. Thiscauses a brittleness which may be responsiblefor superficial fissures. For temperatures up to1200 °C, we therefore recommend weldlessprotective tubes made of material 1.4749, in-stead of the above mentioned material.

Cable Conduit

Insulating RodMetal Protective Tube

Thermocouple

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Ordering Information: Series 1075, Type BM, (Form 1, DIN 43772), (Previously,Type T-EA 15) – High-Temperature Thermocouple with Metal Protection Tubeand without Ceramic Inner Tube (Max. Temperature 1200 °C)Model Product Description1075BM Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)

Code Connection Head IP Rating Conduit Connection ThreadL TZ-A/BL (BUZH), Aluminium 54 M20 x 1.5U GN-BL, Aluminium, DIN 43729 43 M20 x 1.5Y HR-A/BL (BUS), Aluminium 54 M20 x 1.5

Code Sensor Connection2 Terminal block, Form B

Code Number of Elements01 Single02 Double

Code Thermocouple TypeK K

Code Wire Diameter in Millimeters Thermocouple Type Max. Temperature [°C]13 1.38 (duplex) K 100020 2 K 1200

Code Protective Tube Material / Dimensions Inner Tube Material / Max. Temperature [°C]Dimensions

A 1.4762 (AISI 446 - heat-resistent steel), 15 x 2 without 1200B 1.4841 (AISI 314 - heat-resistent steel), 15 x 2 without 1200

Code Nominal Length (NL) in Millimeters0250 2500500 5000710 7101000 1000XXXX Other lengths (max. 2,000 mm)Code Process Connection Material

A1 Adjustable stop flange GTW-35 (cast iron)B1 Adjustable threaded fitting with G 3/4 1.0711 (steel)NN No fitting

Code Additional OptionsR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter

Other Options:• Other connection heads • Other types of thermocouples• Other protective tube materials • Other process connections• Calibration and material certificates (see page 43 )

Flue-gas thermocouples with a fire enamelledprotective tube (up to 600 °C) in dimensions of15 x 3 mm and of material 1.0305 (St 35.8) areavailable on request. The maximal length is2,000 mm.

Ordering ExampleModel Connection Sensor Number of Thermo- Wire Material Nominal Process Additional

Head Connection Elements couple Type Diameter Prot. Tube Length Connection OptionsTypical

Model-No.: 1075BM Y 2 01 K 20 A 0250 NN

Fields of Application:• Tempering furnaces for thermal treatment

processes• Pipelines• Curtains and air ducts• Flue-gas desulphurization plants• Bearing metal -, lead - and tin melts

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Series 1075 Immersion Thermocou-ples, Type AM(K) – with Metal Pro-tective Tube and with/without CeramicInner Tube (Max. Temperature 1700 °C)

It consists of a base-metal thermocouple typeK or precious-metal thermocouples types R, S,or B, and a housing with a protective tubetype AM according to DIN 43733.The single or double type K thermocouple legsare insulated with ceramic elements. Pre-cious-metal thermocouples are insulated witha 4-hole insulating rod and provided with agas-tight inner tube of 15 x 2 mm of ceramictype C 610.

For gas-tight installation of the protectivetube, a gas-tight threaded fitting is necessary(pressure load up to max. 1 bar). Our standardheat-resistant materials for protective tubesare 1.4762 and 1.4841. In addition, we supplytwo protective tube types made of heat-resist-ant Kanthal with an outer diameter of 22 mm.

Protective tubes of Kanthal AF offer follow-ing advantages:• Application temperature up to 1350 °C• High service life, even with a low wall

thickness of 1.3 mm• Faster heat transfer due to low wall thick-

ness leads to a fast response time of thethermocouples

• High temperatures form a tight and ad-hered alumina film, which keeps awayimpurities

• Protective tube length max. 6,000 mm.

Protective tubes of Kanthal Super consist ofsinter material and have following properties:• Application temperature up to 1700 °C• Lower porosity and embrittlement, there-

fore, used at high temperatures and in cor-rosive furnace atmospheres

• Metal protective tubes are influencedamong other things by electromagneticoscillations, which may disturb the functionof the thermocouple. Protective tubes ofKanthal Super suppress these oscillations

• Protective tube length max. 1,500 mm.

Figure 4: Series 1075 immersion thermocouple,type AM(K).


Figure 5: Measuring tip – type AM(K).

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Figure 6: Dimensional drawing – type AM(K).

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Cable Conduit

Insulating Rod

Metal Protective Tube

Thermocouple

Ceramic Inner Tube

Flue-gas thermocouples with a fire-enamelledprotective tube (up to 600 °C) in dimensions of22 x 2 mm and made of material 1.0305 (St 35.8)are available on request. The max. length is2,000 mm.

Fields of Application:• Pipelines• Curtains and air ducts• Flue-gas desulphurization plants• Cooling furnaces in glass tank furnaces

in glass melts• Refuse incinerators

16

Model Product Description1075AM Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)

Code Connection Head IP Rating Conduit Connection ThreadE HR-AL (AUS), aluminium 54 M20 x 1.5G TZ-AL (AUZH), aluminium 54 M20 x 1.5P GN-AL, aluminium, DIN 43729 43 M20 x 1.5

Code Sensor Connection3 Terminal block, Form A


Code Thermocouple TypeB BK KR RS S

Code Wire Diameter in Millimeters Thermocouple Type Max. Temperature [°C]05 0.5 B, R, S 1600 / R, S; 1800 / B20 2 K 1200


C 1.4762 (AISI 446 - heat-resistant steel), 22 x 2 without 1200D 1.4841 (AISI 314 - heat-resistant steel), 22 x 2 without 1200E 1.4762 (AISI 446 - heat-resistant steel), 22 x 2 Typ C 610 / 15 x 2 1200 / R, SF 1.4841 (AISI 314 - heat-resistant steel), 22 x 2 Typ C 610 / 15 x 2 1200 / R, SG 1.4767 (Kanthal AF) 22 x 1.3 Typ C 610 / 15 x 2 1350 / R, SH Kanthal Super 22 x 4.5 Typ C 799 / 10 x 1.5 1700 / B


A2 Adjustable stop flange GTW-35 (cast iron)B2 Adjustable threaded fitting with G 1 1.0711 (steel)NN No fitting

Code Additional OptionsR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter

Other Options:• Other connection heads• Other types of thermocouples• Other protective tube materials• Other process connections• Calibration and material certificates (see page 43 )

Ordering Information: Series 1075, Type AM(K), (Previously, Type T-EA 22) –High-Temperature Thermocouple with Metal Protection Tube and with/withoutCeramic Inner Tube (Max. Temperature 1700 °C)


Ordering ExampleModel Connection Sensor Number of Thermo- Wire Material Nominal Process Additional

Head Connection Elements couple Type Diameter Prot. Tube Length Connection OptionsTypical

Model-No.: 1075AM G 3 01 S 05 E 1000 A2

17


Series 1075 Immersion Thermocou-ples, Type AKK – with Ceramic Pro-tective Tube and Ceramic Inner Tube(Max. Temperature 1800 °C)

This design consists of a base-metal thermo-couple type K or precious-metal thermocou-ples type R, S or B and a housing with a pro-tective tube type AKK according to DIN 43733.

The single or double type K thermocouple legsare insulated with ceramic elements. Precious-metal thermocouples are insulated with a 4-hole insulating rod and provided with a gas-tight inner tube made of ceramic type C 610or C 799.

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Figure 7: Series 1075 immersion thermocouple,type AKK.

Figure 9: Dimensional Drawing – type AKK.

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fFigure 8: Measuring tip – type AKK.

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Cable Conduit

Insulating Rod

Thermocouple

Ceramic Inner Tube

Holding Tube

Ceramic Protective Tube

18


Table 6: Protective and inner tube combinations.

Outer Protec- Inner Thermo- Applications Max.tive Tube Tube couple ApplicationMaterial Type Temperature

C 530 C 610 K Ceramic furnaces in brickworks 1200 °C

C 530 C 799 R Glass tank furnaces: regenerator checkerwork (above) 1600 °C

C 799 C 799 B Glass tank furnaces: side walls, crown, bottom (in pre-drilledchannels up to 50 mm below the bottom) 1800 °C

C 799 C 799 B Glass melting pot 1800 °C

Stop flanges or threaded fittings are neces-sary for installation. Standard materials forthe protective tubes are ceramic types C 530,C 610 and C 799. Gas-tight ceramic materialsare sensitive to thermal shock and impactstress. The tolerance level is optimized by cor-rect selection of materials for protective tubeand inner tube.

We recommend following combinations of ce-ramic protective tubes and inner tubes (seeTable 6).The holding tube is made of material 1.0305.At temperatures above 200 °C, it is recom-mended to use holding tubes made of heat-resistant materials AISI 446 (1.4762) orAISI 314 (1.4841).

19


Model Product Description1075AKK Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)





Code Wire Diameter in Millimeters Thermocouple Type Max. Temperature [°C]05 0.5 R, S, B 1600 / R, S; 1800 / B20 2.0 K (double) 120030 3.0 K (single) 1200


T Type C 530 / 26 x 4 Type C 610 (15 x 2) 1200 / KU Type C 530 / 26 x 4 Type C 610 (15 x 2) 1400 / R, SV Type C 530 / 26 x 4 Type C 799 (15 x 2.5) 1600 / SW Type C 799 / 24 x 3 Type C 799 (15 x 2.5) 1600 / R, SZ Typ eC 799 / 24 x 3 Type C 799 (15 x 2.5) 1800 / B

Code Nominal Length (NL) in Millimeters0500 5000710 7101000 10001400 14002000 2000XXXX Other Lengths (upon request)Code Process Connection Material

A3 Adjustable stop flange GTW-35 (cast iron)B3 Adjustable threaded fitting with G 1 1/4 1.0711 (carbon steel)NN No fitting

Code Holding Tube Material Dimensions in MillimetersG 1.4762 (AISI 446 - heat-resistant steel) 32 x 2H 1.4841 (AISI 314 - heat-resistant steel) 32 x 2J 1.0305 (mild steel) 32 x 2

Code Holding Tube Length (RL) in Millimeters200 200XXX Other lengthsCode Additional OptionsR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter

Other Options:• Other connection heads • Other types of thermocouples• Other protective tube materials • Other process connections• Other holding tube materials • Calibration and material certificates (see page 43 )

Ordering Information: Series 1075, Type AKK, (Previously Type T-EZI 26) –High-Temperature Thermocouple with Ceramic Protective Tube and CeramicInner Tube (Max. Temperature 1800 °C)

Ordering ExampleModel Connection Sensor Number of Thermo- Wire Material Nom. Process Holding Tube Additional

Head Connection Elements couple Type ø Prot. Tube Length Connec. Material Length OptionsTypical

Model-No.: 1075AKK P 3 01 S 05 W 1400 NN H 200

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Series 1075 Immersion Thermo-couples, Type BK – with CeramicProtective Tube and without CeramicInner Tube (Max. Temperature1800 °C)

It consists of a base-metal thermocouple typeK or precious-metal thermocouples type R, S,or B and a housing with a protective tube typeBK according to DIN 43733.

The single or double type K thermocouple legsare insulated with ceramic elements. Precious-metal thermocouples are insulated with a 4-hole insulating rod.

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Figure 10: Series 1075 immersion thermocouples,type BK.

Figure 11: Dimensional drawing – type BK.

Stop flanges and threaded fittings are neces-sary for installation. Standard materials forthe protective tubes are ceramic types C 610and C 799. The holding tube is made of mate-rials AISI 314 (1.4841), AISI 446 (1.4762) ormild steel (1.0305).

Fields of Application:• Glass industry• Vitrified clay furnaces• Hardening bays• Steel industry

Cable Conduit

Insulating Rod

Thermocouple


Holding Tube

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Model Product Description1075BK Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)

Code Connection Head IP Rating Conduit Connection ThreadL TZ-A/BL (BUZH), aluminium 54 M20 x 1.5U GN-BL, aluminium, DIN 43729 43 M20 x 1.5Y HR-A/BL (BUS), aluminium 54 M20 x 1.5

Code Sensor Connection2 Terminal block, Form B



Code Wire Diameter in Millimeters Thermocouple type Max. Temperature [°C]05 0.5 R, S, B 1600 / R, S; 1800 / B13 1.38 K 1200


J Type C 610 / 10 x 1.5 without 1000 / KK Type C 610 / 10 x 1.5 without 1400 / R, SL Type C 799 / 10 x 1.5 without 1600 / R, SM Type C 799 / 10 x 1.5 without 1800 / B

Code Nominal Length (NL) in Millimeters0250 2500500 5000710 710XXXX Other lengths (max. 1,000 mm)Code Process Connection Material

A1 Adjustable stop flange GTW-35 (cast iron)B1 Adjustable threaded fitting with G 3/4 1.0711 (carbon steel)NN No fitting

Code Holding Tube Material Dimensions in MillimetersA 1.4762 (AISI 446 - heat-resistant steel) 15 x 2B 1.4841 (AISI 314 - heat-resistant steel) 15 x 2C 1.0305 (mild steel) 15 x 2

Code Holding Tube Length (RL) in Millimeters080 80XXX Other lengthCode Additional OptionsR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter

Other Options:• Other connection heads• Other types of thermocouples• Other protective tube materials• Other process connections• Other holding tube materials• Calibration and material certificates (see page 43 )

Ordering Information: Series 1075, Type BK, (Previously, Type T-EZI 10) –High-Temperature Thermocouple with Ceramic Protective Tube, without CeramicInner Tube (Max. Temperature 1800 °C)


Head Connec. Elements couple Type ø Prot. Tube Length Connec. Material Length OptionsTypical

Model-No.: 1075BK Y 2 01 S 05 L 0500 A1 A 080

22

Series 1075 Immersion Thermo-couple, Type AK – with Ceramic Pro-tective Tube and without CeramicInner Tube (Max. Temperature 1800 °C)

It consists of a base-metal thermocouple typeK or precious-metal thermocouples type R, S,or B and a housing with a protective tube typeAK according to DIN 43733.

The single or double type K thermocouple legsare insulated with ceramic elements. Precious-metal thermocouples are insulated with a 4-hole insulating rod.

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Figure 12: Series 1075 immersion thermocouple,type AK.


Stop flanges and threaded fittings are neces-sary for installation. Standard materials forthe protective tubes are ceramic types C 610and C 799. The holding tube is made of mate-rials AISI 314 (1.4841), AISI 446 (1.4762) ormild steel (1.0305).

Fields of Application:• Glass industry (e.g. regenerator

checkerwork, tempering furnaces)• Vitrified clay furnaces• Steel industry (annealing and tempering

areas)

Figure 13: Dimensional drawing – type AK.

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Cable Conduit

Insulating Tube

Thermocouple


Holding Tube

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Model Product Description1075AK Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)





Code Wire Diameter in Millimeters Thermocouple Type Max. Temperature [°C]05 0.5 R, S, B 1600 / R, S; 1800 / B13 1.38 K (double) 100030 3.0 K (single) 1200


P Type C 610 / 15 x 2 without 1200 / KQ Type C 610 / 15 x 2 without 1400 / R, SR Type C 799 / 15 x 2.5 without 1600 / R, SS Type C 799 / 15 x 2.5 without 1800 / B


A2 Adjustable stop flange GTW-35 (cast iron)B2 Adjustable threaded fitting with G 1 1.0711 (carbon steel)NN No fitting

Code Holding Tube Material Dimensions in MillimetersD 1.4762 (AISI 446 - heat-resistant steel) 22 x 2E 1.4841 (AISI 314 - heat-resistant steel) 22 x 2F 1.0305 (mild steel) 22 x 2

Code Holding Tube Length (RL) in Millimeters150 150XXX Other lengthCode Additional OptionsR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter

Other Options:• Other connection heads • Other types of thermocouples• Other protective tube materials • Other process connections• Other holding tube materials • Calibration and material certificates (see page 43 )

Ordering Information: Series 1075, Type AK, (Previously, Type T-EZI 15) –High-Temperature Thermocouple with Ceramic Protective Tube, without CeramicInner Tube (Max. Temperatur 1800 °C)


Head Connec. Elements couple Type ø Prot. Tube Length Connec. Material Length OptionsTypical

Model-No.: 1075AK P 3 01 B 05 S 0710 B2 E 150

24

Price Calculation of Precious MetalsThe thermocouple wire diameter varies de-pending on the thermocouple. We offer a wirediameter of 0.5 mm for precious-metal ther-mocouples, as the long-term stability is muchbetter with a thicker thermocouple wire. Otherthermocouple wire diameters, e.g. 0.35 mm, areavailable on request.The price of precious metals is subject to dailyquotation and, therefore, it will be quoted sep-arately. For the price calculation of preciousmetals, the nominal length (NL), the thermo-couple type and the wire diameter are takenover from the corresponding ordering tablewith the help of the model number.

Depending on the connection head size, 55 mmor 80 mm have to be added to the nominallength (NL), in order to get the actual thermo-couple length (TL). With the assistance of thetable below, the total weight of precious met-als per thermocouple can be calculated. Afterdelivery, the confirmed precious metal weightwill be changed into the real weight on our in-voice. Due to the daily quotation, preciousmetal prices have to be inquired at our com-pany.Afterwards, all variables are added to the cor-responding formula.

Following information helps for the price cal-culation:

Precious Metal of following Model-No: _____________________________________________________Length (NL) / Wire Diameter / Weight (g/m) / (see Weight Table) ______________________________Date / Daily Quotation (DM/g) 1) ___________________________________________________________

1) For daily quotation, please contact Rosemount.

Price Calculation for Thermocouples

1. In Connection with DIN-Form B-Connection Head (Protective Tubes, Type BM & BK):

NL (mm) + 55 (mm)Price = —————————- x G (g/m) x T (DM/g)

1,000 (mm)

2. In Connection with DIN-Form A-Connection Head (Prot. Tubes, Type AM, AK & AKK):

NL (mm) + 80 (mm)Price = —————————- x G (g/m) x T (DM/g)

1,000 (mm)

NL = Nominal lengthG = WeightT = Daily quotation

NotePlease double the price for double thermocouples.


Table 7: Weight table (both legs).

Example:Price for 5 piecesModel-No.: 1075BK-Y-2-01-S-05-L-0500-A1-A-080

500 mm + 55 mm———————— x 8.2 g/m x 32.55 DM/g = 146.80 DM 1,000 mm

--> 5 pieces = 734 DM

Precious Metal ExchangeThe reasons for the change in the thermoelectric voltage mentioned inSection 2 require the replacement of precious-metal thermocouplewires in time. Rosemount offers an exchange of the recycling material,returned by the customer, for new thermocouple material. The newmaterial will be charged to an exchange price.

Wire Diameter Weight [g/m][mm] Type R Type S Type B

0.35 3.9 4.0 3.7

0.5 8.1 8.2 7.6

Example:Price for 5 piecesModel-No.: 1075AK-P-3-01-B-05-S-0710-B2-E-150

710 mm + 80 mm———————— x 7.6 g/m x 37.25 DM/g = 223.64 DM 1,000 mm

--> 5 pieces = 1,118.20 DM

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SectionThermocouples for Glass Industry4

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Figure 14: Special thermocouples.

IntroductionRosemount supplies high-temperature thermo-couples worldwide for measurement and con-trol of temperatures in furnaces and chambers,e.g. in glass industry. Because of high temper-atures and corrosive environment conditions,platinum-cladded or coated ceramic protectivetubes are used in these applications. Accord-ing to the melting composition, strong oxida-tions may occur. Depending on the specificprocess conditions, the service life of thermo-couples with platinum protective tubes can beup to 4 - 6 years. Generally, the use of plati-num parts is not recommended in reducing at-mospheres.

In glass melts, present reducing conditionsmay cause low melting phases of oxides (alu-minium, silicon, arsenic, lead) with platinum,which quickly penetrate into the grain bound-aries. Furthermore, conventional alloys showstrong coarse-grain formation at higher oper-ating temperatures. Structure damage by con-tamination leads to loss of stability andbreakage of components.

The introduction of dispersion hardening (DPH)for platinum and its alloys solved these prob-lems to a large extent. The finely dispersed ox-ides impede grain growth and dislocations justbelow the melting point. This results in a clearreduction of the creep rate and an increase instress rupture strength especially at high tem-peratures. Because grain growth is impeded, afine-grained structure is formed, which re-mains stable even at the highest applicationtemperatures. Compared to non-dispersionhardened materials, this characteristic micro-structure guarantees clear improvement incorrosion resistance.

The current platinum DPH materials (Pt-DPH, PtRh90/10%-Pt DPH) distinguish them-selves through following advantages:

• High creep and stress-rupture up to thehighest application temperatures

• Excellent corrosion resistance, even in ag-gressive glass melts

• Ideal microstructural stability in long-termservice

• Good formability• Weldability comparable to non-dispersion

hardened platinum materials

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Figure 15: Special thermocouple measuring tips.

26

Thermocouples for Glass Industry

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Thermocouples with Platinum Pro-tective Tubes

IntroductionDepending on application-specific conditions,like temperature measurement in the moltenglass, clad or coated protective tubes are usedwith platinum or platinum alloys. As a result,the lifetime of the thermocouple is substan-tially increased.

ConstructionThis design consists of single or double ther-mocouples type R, S, or B and a housing witha ceramic protective tube type C 799, whosemeasuring tip is either clad or coated withprecious metal. The platinum-covered protec-tive tube is ground in and the precious-metaltube is cemented-up. To achieve a longer serv-ice life, the wire diameter of the thermocoupleis 0.5 mm. The thermocouple legs are insu-lated with a 4-hole insulating rod.Usually, the ceramic protective tube is cemen-ted into the holding tube. For easy installa-tion, the connection head is mounted on theholding tube. As the temperature above thefitting is generally low, unalloyed steel is usedfor holding tubes. If the holding tube reachesinto the body of the furnace, heat-resistantsteel is to be used.Stop flanges and threaded fittings are neces-sary for installation. You will find an appropri-ate selection in Section 6 - Accessories.

Temperature RangeDepending on the type of glass, thermocoupleswith platinum protective tubes can be used inmolten glass at temperatures up to 1,650 °C.Alloys with a higher rhodium content have alonger lifetime.

Figure 17: Thermocouple with coated protective tube.

Figure 16: Thermocouple with Pt-protective tube.

27


Figure 18: Dimensional drawing – thermocouple withPt-tube.

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Figure 19: Dimensional drawing – thermocouple withPt-coated protective tube.

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For this reason, a thermocouple can be de-scribed only approximately with the help of anordering table. The indicated options are onlyan ordering help. If none of the specified op-tions applies, it is absolutely necessary for thehandling of an inquiry to fill in all emptyfields (options with the codes 0 or X) the ap-propriate technical information.

Ordering ExampleT-EYI-E-2-01-S-05-X-1500-C-560-NN-D-940

Price CalculationThe total price includes the prices for the ther-mocouple, the thermocouple precious metalwires, and the precious-metal tube or coating.The precious-metal prices are subject to dailyfluctuations and, therefore, to be inquired atthe thermocouple supplier.

Ordering NotesThe thermocouples – with protective tubescoated or clad with Pt – are manufactured al-most exclusively according to customer’s speci-fication.

Cable Conduit

Holding Tube

Union Nut

Insulating RodProtective Tube, Mat. PtRh90/10%

Cable Conduit

Holding Tube

Pt Coating

Insulating RodCeramic Protective TubeThermocoupleThermocouple

28

Study:Platinum-Coating Technology

Coating technology of ceramic protective tubesrepresents an alternative to the platinum-cov-ered ceramic protective tubes. These thermo-couples are manufactured by applying a thinplatinum or a platinum-alloy film on a ce-ramic tube. The use of platinum-coated ther-mocouples is particularly suitable for applica-tions where high temperatures exist and ex-cellent corrosion resistance is required.

The use of coating instead of cladding offersfollowing advantages:• Substantial cost saving by reduction of

precious metal weight of 40 to 60%• To increase the protective effect, Pt coatings

can be increased where it is necessary, e.g.at the glass line

• Solder-free design: the risk, that platinumfalls off the thermocouple because of a softjunction and is lost in the furnace, is impos-sible

• Suitable for a large number of ceramicsubstrates

However, there is following disadvantage:• Sensitivity in relation to mechanical dam-

age which substantially influences theservice life


Table 8: Relationship between Pt coating andoperation temperature.

Operating Recommended Type ofTemperature Substrate Coating

1600 °C Ceramic type C 530(resistant to thermal

shocks) Pt

1600 °C Ceramic type C 799 Pt

1650 °C Ceramic type C 799 Pt/Rh90/10%

Table 8 shows the different coating combina-tions, recommended for the different tempera-ture ranges.

ApplicationDue to empirical values two standard designsdeveloped:• Thermocouples for the forehearth zone and• Thermocouples for the crown zone

Installation NotesTo reduce the risk of a thermal shock, it is rec-ommended to pre-heat the thermocouple as-sembly before installation into the gas-tight,ceramic protective tube.Like all other platinum-containing parts, theassemblies are not suitable for a use in reduc-ing atmospheres.

RecyclingAt the end of their service life, Pt coatings canbe completely recycled.

29


Ordering Information: Immersion Thermocouple – with Pt-(Alloy) Clad orCoated Protective Tube (Max. Temperature 1650 °C)

Model Product DescriptionT-EYI Immersion Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)Code Connection Head IP rating Conduit Connection Thread

E HR-AL (AUS), aluminium 54 M20 x 1.5Y HR-A/BL (BUS), aluminium 54 M20 x 1.5G TZ-AL (AUZH), aluminium 54 M20 x 1.5L TZ-A/BL (BUZH), aluminium 54 M20 x 1.5P GN-AL, aluminium, DIN 43729 43 M20 x 1.5U GN-BL, aluminium, DIN 43729 43 M20 x 1.5X Other connection head

Code Sensor Connection

1 Terminal block, Form A2 Terminal block, Form B0 Other connection

Code Number of Elements

01 Single02 Double

Code Thermocouple Type

B BR RS S

Code Wire Diameter in Millimeters Thermocouple Type Max. Temperature [°C]

05 0.5 R, S, B 1600 / R, S; 1800 / BXX Other diameter

Code Protective Tube Material Dimensions in Millimeters Max. Temperature [°C]

A Type C 799 10 1800B Type C 799 15 1800C Type C 530 10 1600D Type C 530 15 1600X Other material

Code Nominal Length (NL) in MillimetersXXXX Customer-specified lengthCode Precious-Metal Tube / Coating Material

A PtB Pt-DPH (dispersion hardened)C PtRh90/10%D PtRh90/10%-DPH (dispersion hardened)E PtRh80/20%F Pt (coated)G PtRh90/10% (coated)N Without tube / coatingX Other material

Code Length of Precious-Metal Tube / Coating (PL) in MillimetersXXX Customer-specified lengthCode Process Connection Material

A1 Adjustable stop flange GTW-35 (cast iron)B1 Adjustable threaded fitting 1.0711 (carbon steel)NN No fittingXX Other connection

Code Holding Tube Material Dimensions in Millimeters

A 1.4762 (AISI 446 - heat-resistant steel) 15B 1.4841 (AISI 314 - heat-resistant steel) 15C 1.0305 (mild steel) 15D 1.4762 (AISI 446 - heat-resistant steel) 22E 1.4841 (AISI 314 - heat-resistant steel) 22F 1.0305 (mild steel) 22X Other material

Code Holding Tube Length (RL) in Millimeters

150 150XXX Other lengthCode Additional OptionsR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter

Other Options:• Calibration and material certificates (see page 43 )

30

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Multipoint Thermocouples

IntroductionThe production of glass depends greatly ontemperature. Even slight variations in tem-perature can change the yield of the final prod-uct. For exact temperature measurement, dif-ferent types of thermocouples are used. Single,sometimes double thermocouples are placed inthe crown of the furnace above the glass sur-face. The ”forehearth thermocouple” consistsof a pure alumina (Al2O3) protective tube, andthe Pt-coated or clad measuring tip. The feederchannel is within the liquid glass. Platinumand its alloys (e.g. with rhodium) are not solu-ble in molten glass, have a high melting point,and highly stable.

ApplicationCurrently, multipoint gradient thermocoupleassemblies are being used to measure tem-peratures at different depths in the moltenglass to control and maintain a uniform tem-perature throughout the melt.

ConstructionThis design consists of precious multipoint-thermocouples type R, S, or B and a housingwith a ceramic protective tube type C 799,whose measuring tip is covered optionally withprecious metal. Usually, the protective tube isground in and the precious metal tube is ce-mented up. To achieve a longer service life, thewire diameter of the thermocouple is 0.5 mm.The multipoint thermocouple legs are insu-lated with ceramic elements.According to the ambient temperature, theholding tube is made of unalloyed or heat-re-sistant steel. For easy installation, an alumin-ium connection head is mounted on the hold-ing tube according to DIN-standards. The sizeof the connection head varies in the outer di-ameter of the holding tube. On the connec-tion head, a glassfibre/silicone/glassfibre-insu-lated compensating cable can be connected.Stop flanges and threaded fittings are neces-sary for installation. You will find an appropri-ate selection in Section 6 - Accessories.

Figure 20: Multipoint thermocouples.


31


Price CalculationThe total price for a multipoint-thermocoupleincludes the prices for thermocouple, thermo-couple precious-metal wires and the precious-metal tube or coating. Precious-metal pricesare subject to daily fluctuations and, therefore,to be inquired at the thermocouple supplier.

Ordering NotesThe multipoint thermocouples are manufac-tured almost exclusively according to custom-er’s specification. For this reason, a thermo-couple can be described only approximatelywith the help of an ordering table. The indi-cated options are only an ordering help. Ifnone of the specified options applies, it is ab-solutely necessary for the handling of an in-quiry to fill in the appropriate technical infor-mation in all empty fields (options with thecodes 0 or X).

Ordering ExampleTX-EYI-P-1-03-S-05-A-0710-N-000-NN-B-150-M1-0705-M2-0655-M3-0605-AGL2-1000

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Figure 21: Dimensional drawing – multipointthermocouples.

Temperature RangeDepending on the type of glass, thermocoupleswith platinum protective tubes can be used inthe molten glass at temperatures up to 1,650 °C.Alloys with higher rhodium contents or dis-persion-hardened platinum (Pt-DPH) have alonger lifetime.

Table 9 illustrates the relationship betweenprotective tube material, type of thermocoupleand max. application temperature.

Table 9: Relationship between protective tubematerial, type of thermocouple and max.application temperature.

Protective Tube Thermocouple Max.Material Type Temperature

Pt Type R/S 1600 °C

PtRh90/10% Type B 1650 °C

Pt-DPH Type B 1600 °C

PtRh80/20% Type B 1650 °C

Compensating Cable, Isolation:Glass Fibre / Silicone Rubber / Glass Fibre

Insulating RodCeramic Protective Tube

Holding Tube

ThermocoupleConnector,

Standard Size

FiberglassCovering

32


Order Information: Multipoint Thermocouple – with Ceramic Protective Tube;Optionally, with Precious-Metal Clad or Coated Protective Tube (Max. Temper-ature 1800 °C) – Part 1Model Product DescriptionTX-EYI Multipoint Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)Code Connection Head IP Rating Conduit Connection Thread


Code Sensor Connection1 Terminal block, Form A2 Terminal block, Form B0 Other connection

Code Number of Elements03 TripleXX Multipoint: number to be stated

Code Thermocouple TypeB BR RS S

Code Wire Diemater in Millimeters Thermocouple Type Max. Temperature [°C]05 0.5 R, S, B 1600 / R, S; 1800 / BXX Other diameter

Code Protective Tube Material Dimensions Max. Temperature [°C]in Millimeters

A Type C 799 10 1800B Type C 799 15 1800X Other material

Code Nominal Length (NL) in MillimetersXXXX Customer-specific lengthCode Precious-Metal Tube / Coating Material

A PtB Pt-DPH (dispersion hardened)C PtRh90/10%D PtRh90/10%-DPH (dispersion hardened)E PtRh80/20%F Pt (coated)G PtRh90/10% (coated)N No tube / coatingX Other material

33


Multipoint Thermocouple – with Ceramic Protective Tube; Optionally, withPrecious-Metal Clad or Coated Protective Tube (Max. Temperature 1800 °C) –Part 2

Code Length of Precious-Metal Tube / Coating (PL) in Millimeters000 No tubeXXX Customer-specified lengthCode Process Connection Material

A1 Adjustable stop falnge GTW-35 (cast iron)B1 Adjustable threaded fitting 1.0711 (carbon steel)NN No fittingXX Other connection

Code Holding Tube Material Dimensions in MillimetersA 1.4762 (AISI 446 - heat-resistant steel) 15B 1.4841 (AISI 314 - heat-resistant steel) 15C 1.0305 (mild steel) 15D 1.4762 (AISI 446 - heat-resistant steel) 22E 1.4841 (AISI 314 - heat-resistant steel) 22F 1.0305 (mild steel) 22X Other material

Code Holding Tube Length (RL) in MillimetersXXX Customer-specified lengthCode Length of Measuring Point (ML) in Millimeters

M1-XXXX Measuring point 1M2-XXXX Measuring point 2M3-XXXX Measuring point 3MX-XXXX Measuring point X

Code Additional OptionsAGL1-XXXX Glass fibre/silicone rubber/glass fibre insulated compensating cable with connected miniature thermocouple plug

incl. specified lengthAGL2-XXXX Glass fibre/silicone rubber/glass fibre insulated compensating cable with connected standard thermocouple plug

incl. specified lengthR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter


34

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Thermocouples with ElectricalShielding

IntroductionThe thermocouple output can be influenced byelectromagnetic radiation, e.g. in electricallyheated furnaces. Depending on the strengthof the electrical field, serious reading errorsmay occur. Usually, shielded compensating ca-bles are used to lead the output signal to thecontrol room. In practice however, this meas-ure is not sufficient to avoid all possible signaldisturbances. Rosemount offers special, elec-trically shielded high-temperature thermo-couples up to 1800 °C, supplied with gas-tight,ceramic protective tubes.

ApplicationThermocouples with electrical shielding areused among other things in glow processes,e.g. during fluorescence powder manufactur-ing. Additionally, these thermocouples areused in the production of technical ceramicsfor electrotechnical and mechanical applica-tions.

ConstructionThis design consists of single or double ther-mocouples type R, S, or B and a housing witha gas-tight, ceramic protective tube type C 799or porous type C 530. To achieve a longer serv-ice life, the wire diameter of the thermocoupleis 0.5 mm. The thermocouple legs are insu-lated with a 4-hole insulating rod. The Pt elec-trical protection is reeled up the insulatingrod and extended by a nickel wire to the ter-minal block.

From the connection head shielded compen-sating cables lead the output signal to the con-trol room.


Usually, the ceramic protective tube is ce-mented into the holding tube. For easy instal-lation, the connection head is mounted on theholding tube. As the temperature above thefitting is generally low, unalloyed steel is usedfor holding tubes. If the holding tube reachesinto the body of the furnace, heat-resistantsteel is to be used. Stop flanges and threadedfittings are necessary for installation. You willfind an appropriate selection in Section 6 –Accessories.

Figure 22: Thermocouple with electrical shielding.

35

Figure 23: Dimensional drawing – thermocoupleswith electrical shielding.


Temperature RangeThermocouples with electrical shielding can beused at temperatures up to 1800 °C.

Price CalculationThe total price for a thermocouple with elec-trical shielding includes the prices for thermo-couple, thermocouple precious metal wires andband. The precious metal prices are subject todaily fluctuations and, therefore, to be inquiredat the thermocouple supplier.

Ordering NotesThermocouples with electrical shielding aremanufactured almost exclusively according tocustomer’s specification. For this reason, athermocouple can be described only approxi-mately with the help of an ordering table. Theindicated options are only an ordering help. Ifnone of the specified options applies, it is ab-solutely necessary for the handling of an in-quiry to fill the appropriate technical informa-tion in all empty fields (options with the codes0 or X).

Ordering ExampleTEP-P-2-01-S-05-B-0710-B-720-NN-D-150

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Cabel Conduit

Insulating Tube

Pt Electrical ProtectionCeramic Protective Tube

Holding Tube

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Ordering Information: Immersion Thermocouple – with Electrical Shielding(Max. Temperature 1800 °C)

Model Product DescriptionTEP Immersion Thermocouple, DIN EN 60584-1 (IEC 584), Tolerance Class 1 acc. to DIN EN 60584-2 (IEC 584)Code Connection Head IP Rating Conduit Connection Thread




Code Thermocouple TypeB BR RS S

Code Wire Diameter in Millimeters Thermocouple Type Max. Temperature [°C]05 0.5 R, S, B 1600 / R, S; 1800 / BXX Other diameter

Code Protective Tube Material Dimensions in Millimeters Max. Temperature [°C]A Type C 799 10 1800B Type C 799 15 1800C Type C 530 10 1600D Type C 530 15 1600X Other material

Code Nominal Length (NL) in MillimetersXXXX Customer-specific lengthCode Electrical Shielding Dimensions in Milimeters

A Pt electrical protection 2 x 0.1B Pt electrical protection 2 x 0.05X Other material

Code Length of Electrical ShieldingXXX Customer-specific lengthCode Process Connection Material


Code Holding Tube Material Dimensions in MillimetersA 1.4762 (AISI 446 - heat-resistant steel) 15B 1.4841 (AISI 314 - heat-resistant steel) 15C 1.0305 (mild steel) 15D 1.4762 (AISI 446 - heat-resistant steel) 22E 1.4841 (AISI 314 - heat-resistant steel) 22F 1.0305 (mild steel) 22X Other material

Code Holding Tube Length (RL) in MillimetersXXX Customer-specified lengthCode Additional Options

AGL3-XXXX Glass fibre/silicone rubber/glass fibre insulated and shielded compensating cable incl. specified lengthR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter


37


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Glass-Level Electrodes

Introduction and ApplicationThese sensors are a very efficient tool for ac-curate level measurement. Our sensors areprovided with two electrodes (double sensor),which avoids an unintended burn-out of anelectrode, due to potential differences betweenmolten glass and earth, as happened to singlesensors. This clearly extends the service life ofthe sensor.

Typical measuring circuits are shown in Fig-ures 25 and 26 for single and double sensorsystem.

ConstructionThis design consists of one (single sensor) ortwo (double sensor) precious-metal wires, plati-num or its alloys and a housing with a ceramicprotective tube type C 799, whose measuringtip is provided with an electrode. The elec-trode tip has usually an outer diameter of3 mm and a length of 20 mm. It is cementedinto the ceramic protective tube. The diameterof the Pt wire, insulated with ceramic elements,is normally 1 mm.According to the ambient temperature, theholding tube is made of unalloyed or heat-re-sistant steel. For easy installation, an alumin-ium connection head is mounted on the hold-ing tube. The size of the connection head var-ies in the outer diameter of the holding tube.Stop flanges and threaded fittings are neces-sary for installation. You will find an appropri-ate selection in Section 6 – Accessories.

Temperature RangeDepending on the type of glass, thermocoupleswith a precious-metal electrode can be used inthe molten glass at temperatures up to 1650 °C.Alloys with higher rhodium parts have a longerlifetime.

Ordering NotesThermocouples with glass-level electrodes aremanufactured almost exclusively according tocustomer’s specification. For this reason, athermocouple can be described only approxi-mately with the help of an ordering table. Theindicated options are only an ordering help. Ifnone of the specified options applies, it is ab-solutely necessary for the handling of an in-quiry to fill the appropriate technical informa-tion in all empty fields (options with the codes0 or X).

Ordering ExampleGLE-P-2-01-S-10-A-0710-NN-B-150

Figure 24: Glass-level electrodes.

38

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Figure 25: Single-sensor system.

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Figure 26: Double-sensor system.


Figure 27: Dimensional drawing – glass-levelelectrode.

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Cable Conduit

Electrode

Detail Drawing

Holding Tube

PtWire,Ø 1 mm

Protective Tube

WH-1500

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Model Product DescriptionGLE Glass-Level Electrode with Precious-Metal ElectrodeCode Connection Head IP Rating Conduit Connection Thread




Code Electrode Wire MaterialS PtRh90/10%X Other material

Code Wire Diameter in Millimeters10 1XX Other diameter

Code Protective Tube Material Dimensions in MillimetersA Type C 799 15X Other material

Code Nominal Length (NL) in MillimetersXXXX Customer-specified lengthCode Process Connection Material


Code Holding Tube Material Dimensions in MillimetersD 1.4762 (AISI 446 - heat-resistant steel) 22E 1.4841 (AISI 314 - heat-resistant steel) 22F 1.0305 (mild steel) 22X Other material

Code Holding Tube Length (RL) in MillimetersXXX Customer-specified lengthCode Additional OptionsR24 TAG plate, stainless steelX1 Fit sensor to temperature transmitter

Ordering Information: Glass-Level Electrode – with Ceramic Protective Tube,Measuring Tip with Precious-Metal Electrode (Max. Temperature 1650 °C)

40


41

SectionCalibration and Certificates5

Tests and Measurements onThermocouples

General PrinciplesVerification in compliance with quality char-acteristics, properties, characteristic data andspecific requirements is defined in standardEN 10204. This standard specifies who mayissue certificates on which conditions.

EN 10204This standard deals with the certification ofmetallic materials (protective tubes, thermo-couple wires) by means of works test certifi-cates and acceptance test certificates.

Material TestingMaterial testing ensures the identifiability ofcertified material from melting to the endproduct and thus that chemical and mechani-cal data are verifiable.

• Works certification according toEN 10204-2.1In the works certification the manufacturerconfirms on the basis of non-specific testsand without expressly stated test resultsthat the product supplied meets the re-quirements of the order.

• Works certificate according toEN 10204-2.2In the works certificate the manufacturerconfirms on the basis of non-specific testsand with the stated test results that theproduct supplied is in accordance with of-ficial regulations, the corresponding ma-terial and manufacturing process andmeets the requirements of the order.

• Works test certificate according toEN 10204-2.3In the works test certificate the manufac-turer confirms on the basis of specific testsand with the stated test results that theproduct supplied is in accordance with of-ficial regulations, the corresponding ma-terial and manufacturing process andmeets the requirements of the order.

• Acceptance test certificate accordingto EN 10204-3.1AIn the above mentioned acceptance test cer-tificate an officially authorized expert con-firms on the basis of specific tests and withthe stated test results that the product sup-plied is in accordance with official regula-tions, the corresponding material andmanufacturing process and meets the re-quirements of the order.

• Acceptance test certificate accordingto EN 10204-3.1BIn the above mentioned acceptance test cer-tificate a works expert, authorized by themanufacturer, confirms on the basis of spe-cific tests and with the stated test resultsthat the product supplied is in accordancewith official regulations, the correspondingmaterial and manufacturing process andmeets the requirements of the order. Thenecessary tests have to be carried out by achecking station, which is independent ofthe production department.

All above mentioned certificates are availableupon request.

42

Calibration and Certificates

Calibration with DKD-Certificate

The calibration of temperature sensors is tobe effected in our calibration laboratoryDKD-K-05601.For many applications, especially in connectionwith the quality assurance system ISO 9000,precise documentation of carried out measure-ments is essential. Maximum measurementreliability is guaranteed by the calibrationcertificates of our calibration laboratory, rep-resented in the German Calibration Service(DKD). It provides documentation with trace-ability to national standards on temperaturerepresentation in conformity with the interna-tional standards (SI).

During the process of compiling a DKD orworks certificate, the thermocouple or measur-ing system, e.g. transmitter with connectedthermocouple, is checked on precise and trace-able comparison standards regarding meas-urement accuracy. DKD-certified thermocouplesare used as a secondary reference for checkingsubordinate measuring systems within a cus-tomer’s QA system. Thermocouples with aworks certificate can be used for documenta-tion of carried out measurements at the serv-ice and quality assurance department.

Our DKD laboratory is authorized to issueDKD calibration certificates for temperaturein relation to thermocouples as calibrationsubject in the measurement ranges shown inTable 10. The measurement uncertainties aredefined in the various calibration points andbased on the double standard deviation (k = 2),(probable coincidence approx. 95%).

The calibrations carried out by the Calibra-tion Laboratory are services for the customer.It is our intention to meet the high quality re-quirements of the customer in relation to ther-mocouple calibration including traceability tonational standards and to accomplish alwaysthe contract commitments with the accredita-tion authority – PTB (German Physical Tech-nical Authority). The thermocouple, whichprovides the measurement result on its ownor as a measuring chain, is compared withthe national standards. This comparisonmeasurement produces quantitative verifica-tion of traceability. A report giving results isissued in form of a calibration certificate ac-cording to DKD specifications (Figure 28).

Table 10: Measured quantities, for which the DKD-laboratory is authorized (extract).

Subject of Temperature Measurement Measurement RemarksCalibration Range Conditions UncertinityThermocouples 0 °C to 1200 °C Comparison with 1.5 KThermocouples standard thermocouples 1 K Comparison withoutType S and R in tube furnaces protective tube in a Pt tube

Transmitter with as for as for U(TE) + 500 mK U(TE) is the measurementconnected thermocouples thermocouples thermocouples uncertainty of calibrating the

thermocouple by itself

43


Works Certificates

The calibrated values can also be certified ona works certificate by using the comparisonmethod. The max. test temperature is 1,300 °C.

A pre-condition for the calibration is a suit-able design of the thermocouple, e.g. it has tohave a certain minimum insertion length.

When ordering a thermocouple, the customerhas to inform about the number and values ofthe test variables, at which the thermocoupleis to be calibrated.

NoteBefore specifying a temperature value, considerthe temperature limits of the thermocouple.

For individual order options see Table 11.

Table 11: Ordering information for calibration options.

Type of Certificate Code

Works Cer tificate: Comparison measurement at thermocouple

with 1 temperature point W1

with 2 temperature points W2




for measuring system with 1 thermocouple W12

DKD Calibration Certificate: DKD Certificate

for 1 temperature point specified by the customer K1

for 2 temperature points specified by the customer K2




for measuring system with 1 thermocouple K12

Of course it is possible to calibrate more than5 temperatures. Prices upon request.

44

Figure 28: DKD certificate for thermocouples – example.

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Figure 29: Works certificate for thermocouples – example.

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Figure 30: DKD certificate – transmitter with thermocouple connected.

47

SectionAccessories6

Transmitters

Into the extended cover of the connection headtypes TZ-A/BL (BUZH) or TZ-AL (AUZH),Rosemount transmitter models 244EH and644H can be inserted.

These transmitters have following commonproperties:• User selectable inputs with a variety of

RTDs and thermocouples• High RFI immunity• Linearization of RTD and thermocouple

inputs• Galvanically isolated inputs / outputs• Electronics module completely sealed in

epoxy resin within a housing. This en-hances transmitter stability and reliability

• Thermocouple outputs are automaticallyprovided with a comparison junction.

• µP-based for enhanced accuracy and stabil-ity

• Ambient temperature effects reduced bytemperature-corrected electronics

The Model 244EH is PC-programmable usingWindows®-based software.

The Model 644H communicates using HART®-protocol (Highway Addressable Remote Trans-ducer) and is compatible with RosemountHART-communicator, HART-based controlsystems, and µP-based AMS software (AssetManagement Solutions). The model 644H ena-bles sensor trimming (one-point or two-pointtrimming) for enhanced total system accuracy.

In addition Rosemount offers a wide range ofrail- or field-mounted transmitters.See the corresponding product data sheets:• Model 244EH and 244ER – PC-Program-

mable Temperature Transmitters(publication no. 00813-0101-4737)

• Model 644H – Smart Head-Mount Temper-ature Transmitters (publication no.00813-0101-4728)

• Model 644R – Smart Rail Mount Temper-ature Transmitters (publication no.00813-0201-4728)

• Model 3144 and 3244MV – Smart Tem-perature Transmitters (publication no.00813-0101-4724)

Figure 31: Transmitters and connection heads.

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Accessories

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Connection Heads (Fig. 32)The present section includes the technicaldata of all connection heads mentioned in thisproduct data sheet. The screwed cable gland isavailable with thread M 20 x1,5. A siliconegasket is used at temperatures up to 200 °C.This gasket is necessary for protection classIP 65.

CableConduit

CableConduit

Protective Tube Connection

Model: TZ-A/BL (BUZH) (Fig. 33)MaterialsHousing Aluminium

Form B acc. to DIN 43729Finish Aluminium lacquerO-Ring-Seal RubberTemp. Limits -40 to +80 °CWeight 0.20 kgProtection Class IP 54Cover Hinged lid, screwedTransmitter Inst. Within cover

Model: TZ-AL (AUZH) (Fig. 34)MaterialsHousing Aluminium

Form A acc. to DIN 43729Finish Aluminium lacquerO-Ring-Seal RubberTemp. Limits -40 to +80 °CWeight 0.22 kgProtection Class IP 54Cover Hinged lid, screwedTransmitter Inst. Within cover

Protective Tube Connection

TerminalBlock

TerminalBlock

Transmitter

Transmitter

49

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Accessories

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CableConduit

CableConduit

CableConduit

CableConduit

Model: HR-A/BL (BUS) (Fig. 35)MaterialsHousing Aluminium

Form B acc. to DIN 43729Finish Aluminium lacquerO-Ring-Seal RubberTemp. Limits -40 to +80 °CWeight 0.24 kgProtection Class IP 54Cover Hinged lid, with lever lockTransmitter Inst. Possible

Model: HR-AL (AUS) (Fig. 36)MaterialsHousing Aluminium

Form A acc. to DIN 43729Finish Aluminium lacquerO-Ring-Seal RubberTemp. Limits -40 to +80 °CWeight 0.24 kgProtection Class IP 54Cover Hinged lid, with lever lockTransmitter Inst. Possible

Model: GN-AL (A) (Fig. 38)MaterialsHousing Aluminium

Form A acc. to DIN 43729Finish Aluminium lacquerO-Ring-Seal RubberTemp. Limits -40 to +80 °CWeight 0.20 kgProtection Class IP 43Cover Lose lid, with 2 screwsTransmitter Inst. Not possible

Model: GN-BL (B) (Fig. 37)MaterialsHousing Aluminium

Form B acc. to DIN 43729Finish Aluminium lacquerO-Ring-Seal RubberTemp. Limits -40 to +80 °CWeight 0.18 kgProtection Class IP 43Cover Lose lid, with 2 screwsTransmitter Inst. Not possible

Protective Tube Connection Protective Tube Connection

Protective Tube ConnectionProtective Tube Connection

TerminalBlock

TerminalBlock

TerminalBlockTerminal

Block

50

Figure 41: Dimensional drawing – adjustablethreaded fitting.

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Ordering Information

Accessories

Mounting Accessories

The connection fittings of thermocouples aresupplied mainly with detachable mountingelements, sealed with a stuffing bush:• Adjustable stop flanges• Adjustable threaded fittings

Code Description Material Tube Inner Diameter /Diameter [mm] Process Connection

HSG 32.400.011 Stop flange GTW-35 (cast iron) 15 16



HSG 32.395.216 Threaded fitting 1.0711 (mild steel) 15 G3/4 A

HSG 32.395.386 Threaded fitting 1.0711 (mild steel) 15 G1A

HSG 32.395.426 Threaded fitting 1.0711 (mild steel) 22 G1A

HSG 32.395.496 Threaded fitting 1.0711 (mild steel) 32 G11/4 A

Figure 40: Dimensional drawing – adjustable stopflange.

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Figure 39: Connection fittings.

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51

Accessories

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Figure 42: Cables.

Thermocouple Wires, Extension andCompensating Cables

Thermocouple WiresThermocouple wires are used to manufacturethermocouples for temperature measurement.The tolerances and application temperaturesof DIN EN 60584-1/2 standards are valid forthe thermocouple wires.Our thermocouple wires are selected andtested in the laboratory. The tolerances betweendesired and actual values are recorded. Thisguarantees a uniform and stable quality of thedelivered goods. The indicated basic valuesand their tolerances are only valid for thermo-couple wires supplied in pairs. The individualthermocouples are designated by a letter, e.g.K for NiCr-Ni thermocouple. The colour cod-ing table is on the back page of this productdata sheet.

Thermocouple materials with restricted toler-ances are obtained by selection. When order-ing from stock it is therefore recommended toinquire about the available quantity.Works certificates may be issued for batchesand individual elements on request. Insulatedthermocouples are used in heat treating proc-esses in the metallurgy, furnace optimization,material tests, aerospace technology, laborato-ries etc. Rosemount offers a flexible solutionfor any application within a temperaturerange of -265 °C up to +1200 °C.

DIN 43722 Standards for Extension andCompensating CablesThe DIN 43722 standards include the Germanversion of the European Harmonization Docu-ment HD 446.3 S, which contains the Interna-tional Standard IEC 584-3: 1989 with commonalterations made by CENELEC.

This standard specifies limit tolerances (ofthermoelectric voltages) for extension andcompensating cables, in accordance with thebasic values of part 1 of the IEC 584-1 stand-ard. Furthermore, this standard specifies themethod for identification of insulated exten-sion and compensating cables. This standardis not valid for mineral insulated cables.

DefinitionsExtension and compensating cables are usedfor the electrical connection between the openends of a thermocouple and the comparisonjunction in those installations where the ther-mocouple legs are not directly connected tothe comparison junction.

Limit TolerancesThe limit tolerances of an extension or com-pensating cable are the maximum possible de-viation in microvolts caused by insertion ofthe extension or compensating cable into themeasuring circuit.

Extension CablesExtension cables are manufactured of thesame material as the corresponding thermo-couple. They are available as stranded lead orsolid wire with different insulations. They aredesignated by letter ”X” following the designa-tion of the thermocouple, e.g. ”KX” – extensioncable for NiCr-Ni-thermocouple, type K.

For thermocouple cables two limit toleranceclasses are defined. For the thermocoupletypes J, E, K, and N the limit tolerance inclass 1 is ± 1.5 °C, and in class 2 is ± 2.5 °C.The limit tolerances for extension cable areonly valid for an application temperaturerange of –25 °C up to +200 °C.

52

Accessories

The application temperature range indicatesthe ambient temperature, which the wholecable may be exposed to, from connection pointto comparison junction, in order to keep thestated tolerances.With regard to the thermoelectrical properties,the maximum temperature is limited to 200 °C,even if the insulating materials would toleratehigher temperatures.

Compensating CablesCompensating cables are manufactured ofspecial materials which have the same thermo-electrical properties in limited temperatureranges as the thermocouple.They are available as stranded lead or solidwire with different insulations.

They are designated by letter ”C” followingthe designation of the thermocouple, e.g. ”SC”– compensating cable for PtRh10%-Pt thermo-couple, type S.Different alloys may be used for the same ther-mocouple type. They are to be distinguished byan additional letter, e.g. KCA and KCB.

For compensating cables only limit toleranceclass 2 is defined. For the types KCA, KCB, NC,RCA, and SCA the limit tolerance is ± 2.5 °C,for types RCB and SCB ± 5.0 °C. Dependingon the type of compensating cable limit toler-ances for an application temperature range of0 °C up to 100 °C, 150 °C, or 200 °C are valid.

For special purposes, additional requirementsare to be fulfilled with regard to the cable con-struction (kind of wiring, number of twists,shield, additional leads) as well as insulation.

Rosemount offers cables with a high chemicalresistance and excellent protection againstmagnetic and electrical influences as well ascables with a high mechanical shield and wideambient temperature range.

Table 12 shows an overview of maximum ap-plication temperatures of the most importantinsulation materials. The indicated values areto be regarded only as reference values.The maximum application temperature forglass fibre, special glass fibre, and Q-fibres isvalid only for single measurements. In this casethe cable is not to be moved and the insulationis wrapped. The maximum temperature forwrapped glassfibre insulation is 250 °C. Infor-mation about the insulation material is relatedto the single lead only. Looking at the outersheath, a mechanical armouring could be at-tached. That means that the outer sheath isthe most external insulation position of thecable construction.

Our special catalogue – ThermocoupleWires, Extension and CompensatingCables – includes all standard cables avail-able from stock. Special cables are deliveredon request.

Insulation Material Max. Temperature [°C]

PVC 105

FEP 200

Silicon rubber 200

PFA Teflon 260

PTFE Teflon 260

Kapton 285

Glass fibre 400

Special glass fibre 700

Q-fibres 1200

Tabelle 12: Maximal application temperatures ofinsulation materials.

53

Questionnaire

Please return to our local sales office in your area.Addresses and fax numbers are listed on the last page of this product data sheet.

Thermocouple Questionnaire

I. General InformationName, Department ____________________________________________________________

Telephone No. _________________________ Telefax __________________________

Company ____________________________________________________________

Address ____________________________________________________________

Inquiry / Ordering No. ____________________________________________________________

II. Thermocouple Assembly❑ Series 1075 standard thermocouples with deviations

❑ Special thermocouples, e.g. for glass industry

III. Operating Conditions1 Field of Application ____________________________________________________________

1.1 Place of installation ____________________________________________________________

1.2 Position of installation ____________________________________________________________

1.3 Temperature Operating temperature _____________________________________

Temperature range _____________________________________

1.4 Temperature change ❑ often ❑ middle ❑ rarely ❑ min. ❑ max.

1.5 Medium ____________________________________________________________

1.6 Pressure Nominal pressure _________________________________________

Operating pressure _________________________________________

1.7 Flow rate ____________________________________________________________

1.8 Vibration ____________________________________________________________

1.9 Miscellaneous ____________________________________________________________

IV. Environmental ConditionsAmbient temperatures [°C] ____________________________________________________________

Air humidity [% RH] ____________________________________________________________

Electrical interferences ❑ existing ❑ not existing

Rosemount Heraeus Sensor

54

V. Thermocouple Configuration1 Temperature Sensor ____________________________________________________________

1.1 Tolerance ____________________________________________________________

1.2 Configuration ____________________________________________________________

1.3 IP rating ____________________________________________________________

2 Protective Housing ____________________________________________________________

2.1 Protective tube ____________________________________________________________

2.2 Mounting details ____________________________________________________________

2.3 Extension / holding tube ____________________________________________________________

2.4 Insertion / nom. length ____________________________________________________________

3 Material Certificates ____________________________________________________________

4 Connection ____________________________________________________________

4.1 Connection head / box ____________________________________________________________

4.2 Cable / lead ____________________________________________________________

4.3 Transmitter ____________________________________________________________

4.4 Others ____________________________________________________________

5 Test, Certificates ____________________________________________________________

6 Accessories ____________________________________________________________

7 Add. Requirements ____________________________________________________________

VI. Additional Information1 Competition ____________________________________________________________

2 Target price ____________________________________________________________

3 Quantity _____________ Monthly _______ Annually _______ Once _________

4 Requested delivery date ____________________________________________________________

5 Packing instruction ____________________________________________________________

Remarks, sketch, plan of installation, photographs (on a separate page, if necessary)

QustionnaireRosemount Heraeus Sensor

55

Colour-Coding Table

Colour Coding for Extension and Compensating CablesThemocouple Type Designation Positive (+) Negative (-) Sheath Standards

NiCr-Ni K green white green DIN EN 60584-3

Fe-CuNi J black white black DIN EN 60584-3

Cu-CuNi T brown white brown DIN EN 60584-3

NiCr-CuNi E violet white violet DIN EN 60584-3

PtRh13%-Pt R orange white orange DIN EN 60584-3

PtRh10%-Pt S orange white orange DIN EN 60584-3

PtRh70%-PtRh6% B grey white grey DIN 43722

NiCrSi-NiSi N pink white pink DIN 43722

NiCr-Ni K red green green DIN 43714

Fe-CuNi L red blue blue DIN 43714

Cu-CuNi U red brown brown DIN 43714

PtRh13%-Pt R red white white DIN 43714

PtRh10%-Pt S red white white DIN 43714

PtRh70%-PtRh6% B red grey grey DIN 43714

NoteFor the outer insulation of glass fibre or steel wire braiding, the colour coding is to be effected with a coloured tracer acc. to DIN EN 60584-3 standards, andthe colour of the positive leg.

PDS25-42654.A01 5.10.99 G+K/Kroeber Printed in GermanyTechnical alterations reserved

Heraeus Sensor GmbHRosemount Heraeus SensorFrankenstrasse 2163791 Karlstein-DettingenGermanyPhone +49 (6188) 992-0Fax +49 (6188) 992-112Internet www.fisher-rosemount.de/hsg

www.rosemount.com

Fisher-Rosemount Temperature BVDe Langkamp 3b3961 MR Wijk bij DuurstedeNetherlandsPhone +31 (343) 596-363Fax +31 (343) 596-345

Fisher-Rosemount Ltd.Heath PlaceBognor RegisWest Sussex PO22 9SHU.K.Phone +44(1243) 863-121Fax +44(1243) 867 5541

high-temperature thermocouples - automaatika temperature thermoc.pdfkanthal is registered trade mark...

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