TechnicalInformationTI 064F/00/en

Application Continuous level measurement using

capacitance sensors in tanks or siloscontaining liquids or bulk solids

Continuous level measurement withhydrostatic sensors Deltapilot S intanks containing liquids

Limit detection using capacitancesensors in tanks or silos containingliquids or bulk solids

Limit detection with vibrating probesLiquiphant FDL 30/31 in tankscontaining liquids

Combination of continuousmeasurement and limit detection

Continuous level measurement inmaterials of changing characteristicsproviding an automatic correction ofcalibration to compensate for changesin dielectric constant (capacitancemeasurement) or density (hydrostaticmeasurement).

The two integral setpoint controllers arefully programmable to provide directpump control (adjustable hysteresis)and/or additional min./max. alarm.

Features and Benefits Intrinsically safe signal input

[EEx ia] IIC or IIB allows use withsensors operating inexplosion-hazardous area Zone 0

A family of sensors allows levelmeasurement in liquids and bulksolids under extreme conditions, e. g.: high pressure high temperature condensation aggressive material heavy solids.

Level Measurementsilometer FMC 671 Z

For liquids and bulk solids.Operates in dialogue with a computer as well asmanual remote operation. Direct control andtwo-point control by integral setpoint controllers.

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Silometer FMC 671 ZCalibration elements for on-site dialogue,LCD for measurements and parametersentered, mode indication of setpointcontrollers and test sockets on front panel.

Measuring System The following figures show examples ofcomplete measuring systems.

Capacitance rod probe withelectronic insert EC 37 Z or EC 47 Z

Capacitance rope probe withelectronic insert EC 37 Z or EC 47 Z

Hydrostatic sensor Deltapilot S withelectronic insert FEB 17

Silometer FMC Analog output current and voltage

signals Two limit signals from the continuous

measurement, with adjustablehysteresis.

Capacitance rod probe withelectronic insert EC 17 Z

Vibrating probe Liquiphant FDL 30/31 Capacitance rope probe with

electronic insert EC 17 Z Silometer FMC Two setpoint signals, same

switchpoint, but min./max. mode foreach relay independently selectable.One common adjustable switchingdelay.

Capacitance probe with electronicinsert EC 37 Z or EC 47 Z forcontinuous level measurement

Vibrating probe Liquiphant FDL 30/31for maximum limit detection

Silometer FMC Analog output signals current and

voltage, proportional to level orcontents

Setpoint signal, fully adjustable forthe continuous measurement, withadjustable hysteresis

Maximum limit detection.

Capacitance probe with electronicinsert EC 37 Z or EC 47 Z forcontinuous level measurement

Capacitance probe with electronicinsert EC 17 Z for calibrationcorrection, installed at a point that theproduct level passes most frequently

Silometer FMC Analog output signals current and

voltage Two setpoint signals from the

continuous measurement, adjustableswitch hysteresis.

Continuous levelmeasurement in aliquids tank or bulksolids silo

Limit detection in aliquids tank or bulksolids silo

Combination ofcontinuous levelmeasurement andlimit detection

Continuous levelmeasurement withautomatic calibrationcorrection (example 1)

2

Measuring System(continued)

Hydrostatic sensor Deltapilot S withelectronic insert FEB 17 forcontinuous level measurement

Vibrating probe Liquiphant FDL 30/31for calibration correction, installed ata point that the product passes mostfrequently

Silometer FMC Analog output signals current and

voltage Two setpoint signals from the

continuous measurement, adjustableswitch hysteresis.

Measuring Principle InputsThe sensors for continuousmeasurement and the sensors for limitdetection are each connected to theinputs by unscreened two-wire cable.The Silometer supplies the electronicinserts (transmitters) in the sensor. Aninterference-free PFM signal,proportional to level, is received. Forlimit detection with the Liquiphantvibrating fork probes, a frequencychange indicates that the desired levelhas been reached.Both intrinsically safe signal inputs(input 1 for continuous measurement,input 2 for limit detection) aregalvanically isolated from the supplyand outputs. By coupling both inputs,automatic compensation of thecontinuous measurement mode ispossible. This means no re-calibrationis required on changing materialcharacteristics.

Special Functions for ContinuousMeasurement Linearisation of Vessel Shape

The vessel curve describes thefunctional relationship between theheight h and the vessel volume V. Thisis represented on the SilometerFMC by 230 benchmarks. Thesepoints are determined eitherempirically or by the vesselmanufacturer. A known curve can alsobe entered into the instrument. Themost common curve (for a cylindrical,horizontal tank) is also programmedinto the instrument.

Continuous levelmeasurement withautomatic calibrationcorrection (example 2)

PFM signalbetween EC andSilometer FMC

Linearisation ofvessel shape

3

Measuring Principle(continued)

Automatic Calibration Correction forChanging Vessel ContentsThe zero of the level curve isdetermined by empty calibration.When the level reaches the correctionprobe (at 60% in the diagram), thereference point K1 and therefore thegradient is determined.If the dielectric constant or the densityof the material increases, then the

slope becomes less pronounced.Thus, K1 is reached on filling thevessel, before the level has reached60%. Indication remains constant onrising level until the level reaches thecorrection probe. Point K3 is thenfixed, and the PFM signal is correctedaccordingly.This correction takes place both onrising and on falling levels.

Output Signals The analog output signals are

standardised 020 mA or 420 mAcurrent and 010 V or 210 Vvoltage.Depending on calibration, outputsignals are proportional either to thelevel or to the contents of the vessel.The linearisation curve for contentsindication on any vessel can beprogrammed easily.In the event of failure, the outputsignal may be programmed to drive10% or +110%, or hold the lastmeasurement .

Two setpoint controllers each with apotential-free change-over contact areintegral to the Silometer. Each can

be operated in minimum or maximumfail-safe mode with adjustablehysteresis. This allows selection for fulland empty alarm and also two-pointcontrol. The setpoint controllers areindividually energised either by input 1(continuous measurement) or by input2 (limit detection).

The fault alarm also has apotential-free change-over contact.Should a fault occur, then the relayde-energises.

Sockets are located on the front panelto connect to the Commulog VU 260 Zfor on-site programming and for directaccess to the current outputs.

Measuring Signal and FunctionIndication on the Instrument The LCD indicates the level or

contents of the tank or silo either inper cent or preset engineering units.By selecting the appropriate matrixfield, other data may also bedisplayed, e. g. frequency of the PFMsignal input and in the case of a fault,its code number.Similarly, the programmed data, suchas the required level for an outputsignal 0 mA and 20 mA, processingtime, switchpoints and hysteresis of

setpoint controllers, linearisationvalues for contents measurement,offset and sensor sensitivity withelectronic insert or the completemeasuring system, is stored and maybe called up.

The bar display (10 part LCD) belowthe digital readout indicates actualpercentage of full scale achieved.

Clear display of the matrix fieldselected prevents error when readingthe display or entering data.

Calibration correction: Capacitance probe

or Deltapilot S for levelmeasurement

Capacitance probeor Liquiphant forcalibration correction

4

Measuring Principle(continued)

The green and red LEDs in the centreof the front panel indicate whether thesetpoint controller relays areenergised or de-energised. Theoperator can see at a glance whethera critical situation has occurred (toofull or too empty).

The green LED below indicates whenthe Silometer is operating in dialoguewith the Modbus gateway ZA 672 orCommulog VU 260 Z.

Fault or warning is indicated by thered LED . In fault conditions, the LEDlights up, and it flashes to give awarning. Warning is given e. g. onfalse operation.

Operation Parameters can be set on the SilometerFMC 671 Z from the front panel usingonly 6 pushbuttons and a table(operating matrix). The operating matrixis in two languages and is mountedwithin the instrument to one side. Thematrix field required is selected usingthe V and H buttons whilst the otherbuttons allow data to be entered.(See operating instructions for furtherinformation.)

Calibration for continuousmeasurement can be carried out atany level and in any sequence:empty calibration at any level between0% and 40%, full calibration between60% and 100%. This eliminates theneed to completely empty and fill thevessel for calibration purposes.

Calibration for continuousmeasurement with automaticcalibration correction is even simpler.Only empty calibration needs to becarried out. The Silometer calculatesthe full calibration automatically(gradient of curve) as soon as thelevel reaches the correction probe.

Calibration for limit detection can becarried out easily by pushbutton withthe probe covered or free.

On-site calibration of the SilometerFMC 671 Z using the CommulogVU 260 Z is straigthforward,since data exchange takes place bydialogue with the FMC, givingadditional information on the largeannotated display of the VU 260 Z.

The Silometer with its integratedmicroprocessor is self-checking fromthe PFM input signals to the output.

Installation The Racksyst card must be installedoutside the explosion-hazardous area ina rack or protective housing. E+H offers: a 19" rack for control panel mounting,

housing up to 12 FMC cards a 19" remote housing conforming to

IP 65 protection the Monorack housing (7 HP) for

individual card mounting in the controlpanel.

Planning directions, tables andself-adhesive connection schematics tosimplify rack assembly and remotehousing and also installation diagramsare available on request.

FMC 671 Z

V0

H0

0 100

V H12+

E

mA+

4-digit display,floating pointindicationgreen LED =relay energised

indication ofmatrix fieldselectedLCD strip10 stage(bar graph)

green LED =remote dialogue

red LED =fault

red LED =relayde-energised

Measuring signal andfunction indication onSilometer FMC 671 Z

FMC 671 Z

V0

H0

0 100

V H12+

E

mA+

4-digit display,floating pointindication

countbutton upcountbutton down

indication ofmatrix fieldselected

buttons to selectmatrix field

button fornumber selection

button for dataacceptance

Operating elements onSilometer FMC 671 Z

5

Electrical Connection Connecting InstructionsIf the sensors are to be mounted in anexplosion-hazardous area, then anappropriate connection strip is availablefrom E+H. This connection strip, toDIN 41612 format F, is only partlypinned (28 pole) and conforms to theexplosion protection regulations relatingto spacing and creepage. It is fitted withcoding pins to ensure that only aSilometer FMC 671 Z can be connected.The device exhibits goodelectromagnetic compatibility.For optimal use, however, it isrecommended that two-core, screenedcable is used to connect the sensor(resistance up to25 per core). If possible, ground thescreen at both ends. Otherwise,preferrably at the sensor end.Please note regulations when layingcable in an explosion-hazardous area.

General Notes for ConnectingControllers, Limit Switches,Recorders, Indicating Instruments For instruments with a non-isolated

input (e. g. HTA 470 Z), only oneinstrument can be directly connectedto the current output. Severalinstruments can be connected to thevoltage output in parallel if theirpotentials are all related to thenegative pole of the 24 V supply.

Except for the minimum or maximumload, there is no restriction onpotential-free instruments.

Connecting Signal Instrumentsand Control Systems to the RelayContacts of the Limit SwitchesWhen connecting the signal systems,note the relay mode depending on leveland safety mode required.If an instrument with high inductance(e. g. solenoid valves etc.) is to beconnected to the Silometer, then a sparkarrester should be fitted to protect therelay contacts.

Safety Mode for Limit SwitchesBoth relays may be independentlyoperated in minimum or maximumfail-safe mode. Minimum Mode: The relay

de-energises when the level fallsbelow the switchpoint or a fault occurs.

Maximum Mode: The relayde-energises when the level risesabove the switchpoint or a fault occurs.

By correctly selecting the safety mode,the operator ensures that the outputrelays always operate in a safety mode,i. e. alarm on de-energising.

d b z+ +

+

+

2

468

21

+

FDL 30/31z2z4

2

3

1

2

+

+

EC 37 Z

FEB 17

d2

d2

d4

d4

21

+

EC 47 Zd2d4

21

+

EC 17 Zz2z4

LL+ 20 V...30 V

z30d32

+

d2d4

+

+

d12

d10

d14

b10

0/420 mA

ZA 672

++b12b14 0/210 V

r

r

r

z26

z22

z18

d28

d24

d20

z28

z24

z20

u

u

u

a

a

a

10

12

14

16

32 L+

18

2022

24

26

28 a

a

a

r

r

r

u

u

u

30

+

L

explosion-hazardous area

inputcontinuousmeasurement

non Ex

vibrating probeLiquiphant

SilometerFMC 671 Z

inputs

Rackbus(E+H Bus)

current

inputlimit

or

or

or

capacitanceprobe

hydrostaticsensorDeltapilot S

capacitanceprobe

capacitanceprobe

remotedialogue

levelorcontents

analogoutputs

supply

voltage

min./max.

min./max.

levelalarm

levelalarm

DC voltagesupply

faultalarm

Terminal connection onthe Silometer FMCThe negative pole of the24 V supply voltage andthe negative poles ofthe output signalscurrent and voltage areconnected to the zeropoint of the FMC.

6

Technical Data Mechanical constructionDesign Racksyst card to DIN 41494 (Eurocard)

Front panel black plastic with inlaid blue area, with handle and label area

Weight approx. 0.3 kg

Process conditionsPermissible ambient temperature operating range 0+70 C, storage range 20+85 C

Protection type to DIN 40050 front panel IP 20, card IP 00

Electrical connectionPlug-in connection strip to DIN 41612, part 3, format F (28 pole)

Coding pins in strip at point 1 and 22

Supply voltage 24 V DC, tolerance +6 V, 4V

Permissible AC ripple U~pp 2 V within tolerance

DC supply approx. 90 mA, max. 125 mA, integral fine-blow fuse

Signal input: galvanically isolated from other circuitsExplosion protection typeFMC 671 Z, 676 Z

[EEx ia] IIC or IIB

Electromagnetic compatibility Interference emission to EN 61326, Electrical Equipment Class AInterference immunity to EN 61326

Sensors for continuousmeasurement

capacitance probes with electronic insert EC 37 Z or EC 47 Z orDeltapilot S

Supply voltage for electronic insert 14.515.5 V

Supply current max. 22 mA

Short-circuit current max. 95 mA continuous

Connection cable recommended: 2-core, screened, max. 25 per coreSignal transmission pulse-frequency-modulation

Pulse current approx. 5 mA, superimposed on supply current

Pulse width approx. 100 sTransmission frequency(EC 37 Z/EC 47 Z)

range I: 0.552.8 kHz, equivalent to 20355 pFrange II (standard): 0.062.8 kHz, equivalent to 204350 pF

Signal outputCurrent output 020 mA, selectable to 420 mA, RL max. 500 Voltage output 010 V, selectable to 210 V, RL min. 10 kOutputs from setpoint controllers 2 independent relays each with 1 change-over contact

Switchpoints and switchinghysteresis

infinitely adjustable

Safety mode minimum or maximum, switchable

Switching max. 2.5 A, max. 250 V AC, max. 300 VA at cos > 0,7max. 100 V DC, max. 90 W

Fault alarm 1 relay with potential-free change-over contact

Indication and calibrationFMC 671 Z LCD and 6 buttons fr on-site dialogue, 6 LEDs for function control

7

Dimensions

Accessories Commulog VU 260 Z Modbus gateway ZA 672

SupplementaryDocumentation

Planning documentation for Racksystracks or Racksyst remote housingsand self-adhesive connectionschematics (state instrument type)

Monorack Protective HousingTechnical Information TI 099F/00/en

Electronic Inserts EC 37 Z, EC 47 ZTechnical Information TI 271F/00/en

Electronic Insert EC 17 ZTechnical Information TI 268F/00/en

Deltapilot SSystem Information SI 026F/00/en

Deltapilot S DB 50, DB 51, DB 52Deltapilot S DB 50 LDeltapilot S DB 53Technical Information TI 257F/00/en

EC-Type-examination certificateTV 00 ATEX 1640

II (1) GD, [EEx ia] IIC/IIBXA 110F/00/a3

Electronic Inserts FEB 11/FEB 17,FEB 11 P/FEB 17 PKA 048F/00/a3

Liquiphant FDL 30/31 and FDL 35/36Technical Information TI 185F/00/en

Commulog VU 260 ZTechnical Information TI 140F/00/enOperating Instructions BA 028F/00/a3

Modbus Gateway ZA 672Technical Information TI 148F/00/enOperating Instructions BA 054F/00/en

General information on EMC(Testing method, installationrecommendations)Technical Information TI 241F/00/en

Hauser+EndressThe Power of Know How

TI 064F/00/en/04.03SL/CV5

15160

7 HP

7.4535.532.5

3H

U

100

128.

4

Dimensions of theplug-in card [mm]

05.02/PT1

Endress+HauserGmbH+Co. KGInstruments InternationalP.O. Box 2222D-79574 Weil am RheinGermany

Tel. (07621) 975-02Fax (07621) 975-345http://www.endress.cominfo@ii.endress.com

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