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Operation Manual

EC24 (Type MWG 2411, MWG 2412, MWG 2413 and MWG 2414)

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Content Page Content 2 For your Safety 3 General Description 3 Operational Hints 4 Securing the Explosion Protection 4 Detection Principle 4 Design 4 Mounting Position of EC 24 5 Mounting 6 Installation of Electrical Connections 6 Putting in Operation 7 Check of Electrical Zeropoint 7 Check of Sensitivity 8 Service 10 Maintenance and Inspection 10 Trouble Shooting 10 List of Spare Parts 10 Accessories 10 Detection Ranges and Gases: 11 Sensor Specification 12 Wiring Diagram MWG EC2411 with 0.2 .. 1 mA Output 14 Wiring Diagram MWG EC2412 with 4 .. 20 mA Output 14 Terminal Diagram MWG EC241x 15 Technical Data 16 Annex 17

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For your Safety According to § 3 of the law about technical working media, this manual points out the proper use of the product and serves to prevent dangers. Like any piece of complex equipment, the GfG transmitter EC24 will do the job designed to do, only, if it is used and serviced in accordance with the manufacturer's instructions. This manual must be carefully read by all individuals who have or will have the responsibility for using and servicing this product. The warranties made by GfG Gesellschaft für Gerätebau with respect to the product are voided, if the adjustment of functions or parameters is changed without GfG Gesellschaft für Gerätebau’s permission. They are also voided, if the product is not used and serviced in accordance with the instructions in this manual. Please protect yourself and your employees by following them. The above does not alter statements regarding GfG Gesellschaft für Gerätebau's warranties and conditions of sale and delivery.

General Description A fixed gas monitoring system consists of the transmitter (MWG) and a controller (GMA), which are connected by means of cable. The transmitter converts the unit for the gas concentration into an electrical signal and transmits it over the cable to the controller.

Fixed gas monitoring and warning system

A 1 F A U L T

A 3 A 2

40

ON

F AUL T

60

20

100

80

%

C H A N N E L

TYPE LA BEL INSI DE

TES T QUIT

A2

A3

A1

MENU MENU

U

in/M

U

out/ N

M E N U

Measurement

Evaluation Warning

20 ppm Cl 2

Fig. 1

The transmitter EC24 is an "intelligent" transmitter. Its comprehensive electronics allows easy operation and maintenance and also increases the operational safety and accuracy. The special features of the EC24 are:

• Easy calibration at site. • Service lid for adjustment of zero point and sensitivity. • Compensation of temperature effects.

Depending on the model, the EC24 is available with built-in or external sensor, providing an output signal of either 4 .. 20 mA or 0.2 .. 1 mA.

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Transmitter Type MWG 2411 MWG 2412 MWG 2413 MWG 2414 Explosion protection Yes Yes No no Sensor built-in built-in external external Output 0.2 - 1 mA 4 - 20 mA 0.2 - 1 mA 4 - 20 mA

Operational Hints According to national regulations gas warning devices have to be checked by a specialist for function after installation but before being brought into service (putting into operation). For Germany § 4.4.2 "BGR 500 chapter 2.33" (UVV Gase, BGV B6 - formerly VBG 61) is applicable.

Before shipment, the EC24 passes a function and display test, being calibrated with suitable test gases. This does not, however, overrule the obligation of putting into operation with test gas after the installation.

The transmitters MWG 2411 and MWG 2412 are approved for the use in explosion endangered areas of zone 2 as per EN 50021 and can be used according to directive 94/9/EG (ATEX100a):

Labelling: II 3G EEx nR [L] IIC T6 X -20°C ≤ Ta ≤ +50°C Important for NH3 measurement After an exposure to a NH3 concentration of more than 400 ppm the sensitivity of the transmitter has to be checked.

Securing the Explosion Protection The next paragraph refers only to transmitter models MWG 2411 and MWG 2412.

!Installation, putting in operation and opening the service lid, the transmitter enclosure or the cable entry is only allowed in the absence of combustible gases and vapors.

Once the above work is completed, the transmitter enclosure, the service lid and the cable entry must be closed.

The explosion protection of the transmitter is secured by an almost gas-tight closure.

In case the transmitter is not connected to a GfG controller, the voltage supply outside the transmitter must be protected by means of a fuse of max. 200mA !

Detection Principle The EC24 uses an electrochemical cell, which generally contains an electrolyte, a working electrode (anode), a counter electrode (cathode) and a reference electrode. The cell is adapted to the gas to be monitored by specific electrodes and a suitable electrolyte. The electrochemical reaction generates an electrical signal, which is proportional to the gas concentration. This signal is amplified by the EC 24 and used for display resp. transmission. The sensor cells are using the capillary diffusion barrier technology, which, in combination with an additional temperature compensation, avoids effects caused by changing atmospherical pressure and temperature. Some sensor cells are available with a pre-filter to improve their selectivity.

Design The design of the EC24 is shown in fig. 2. The exact transmitter type is mentioned on the type label (pos. 3). The sensor cell is protected by the sensor holder (pos. 10). Behind the service lid (pos. 7) you find the potentiometers for zeropoint and sensitivity (calibration) adjustment as well as test sockets for connecting a meter to check both the zeropoint and the sensitivity (see fig. 3). The casing contains the main board and the calibration card. The circuits on the main board convert the sensor signal into an output current of 4 .. 20 mA or 0.2 .. 1 mA. The calibration card collects the adjustment elements. The sensor holder includes the sensor board with the components for controlling the sensor.

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Transmitter EC24 – Design

2. Casing top cover)

3. Casing bottom

5. Type label

4. Detection range and gas

7. Service lid

6. Fixing screw for service lid

8. Cable screwing

11. Sensor holder

12. Diffusion inlet

10. Lock screw

9. Special screws for fixing of casing top

1. Groundingclip

Fig. 2

Mounting Position of EC24 It is essential to exactly know the ambient conditions, which have to be taken into consideration before deciding on the mounting position. To achieve representative measurement results, take care of

• the room ventilation and • the gas density.

Install the EC 24 at a place where the gases pass the sensor even in case of bad ventilation. If necessary, use a smoke cartridge to check. Furthermore, take the following into consideration as well:

• Rain water, hose water, dripping water, condensate and • dust in the atmosphere.

The EC24 is to a great extent protected against the entering of water and dust. Special accessories are available to provide additional protection for very difficult conditions. Please contact GfG for detailed information.

!

Warranty may be voided, if the sensor is exposed to ambient conditions which were unknown to GfG during planning, production or delivery.

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When deciding on the position for the transmitter, make sure that it is always accessible for service

and maintenance. It is recommended to mount the EC24 with the sensor showing to the floor. Different installation, however, does not affect the measurement accuracy.

Mounting

! Refer to „Securing the Explosion Protection“ on page 4.

For connecting the EC24 refer to the terminal diagram (page 15) and to the connection diagram EC24 (page 15). For mounting the transmitter remove the four special screws (fig. 2, pos. 9) and take the casing top off. Fix the casing by means of two borings.

Installation of Electrical Connections

! Refer to „Securing the Explosion Protection“ on page 4.

Procurement of cable and electrical connections must be done by a specialist only, obeying the applicable regulations. Depending on the model or the operation of the EC24, a shielded 2- or 3-core cable has to be used (e.g. LIYCY 3 x 0.75 mm²). The shield is laid on the cable entry. Should the transmitter be mounted to electrically conductive material (e.g. steel beam), a potential compensation must be effected (fig. 3).

Connection Connection Potential compensation MWG 2411 / MWG 2413 MWG 2412 / MWG 2414

Potential compensation

Transmitter

Cable entry

Sensor

e.g.

ste

el b

eam

(min. 4 mm ) 2

4 5 6

24V Ground

Controller

0.2 .. 1 mA

4 5 6

24V 4 .. 20 mA Gro und

Controller

Fig. 3

For models with external sensor: In case you separate the cable with its connector plug from the transmitter casing, remove the sensor cell from the sensor holder. Then put a short circuit bridge on the two soldering pins of the p.c.board to avoid accelerated ageing. Remove this short circuit bridge before re-fitting the sensor cell. The above also applies on all other EC24 models with the a.m. soldering pins on their p.c.board. Fix the casing top with the four special screws after installation.

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Putting in Operation

! Refer to „Securing the Explosion Protection“ on page 4.

Once the EC24 is installed, a skilled person can put it in operation. The EC24 has been calibrated and tested before shipment.

Check of Electrical Zeropoint

! Refer to „Securing the Explosion Protection“ on page 4.

The EC24 is calibrated and tested before shipment. Certain deviations, however, are possible due to transport, mounting and ambient conditions. Allow a warm-up time of about 30 minutes before checking the electrical zeropoint. Once the warm-up is finished, you can check the voltage at the test sockets (UM) behind the service lid of the EC24 (fig. 4) and read the value at your GMA controller (please refer to the operation manual for your GMA).

Service lid

Connector UM for volt meter

Potentiomete "ZEROPOINT"

Potentiomete "CALIBRATION"

Fig. 4

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Please adhere to the following procedure to check the electrical zeropoint:

Use calibration adapter to supply zero Zero gas means:

For toxic gases: Air without interfering gas For oxygen: 100 Vol. % nitrogen (N2)

no yes

Open service lid at MWG.

Connect voltmeter to UM plug (fig. 4).

yes no

Ensure that alarms are transmitted again.

Check and if necessary adjust UN at the GMA controller. Please refer to the operation manual of your GMA controller!

Make sure that the alarm cannot be transmitted.

Close service lid at MWG.

Is UM = 0.2 V ?

Use potentiometer NULL to adjust the zeropoint until UM = 0.2 V.

Is there any interfering gas present?

Oxygen (O2) Toxic gases

After zeropoint adjustment have a look on the display for another 2 minutes. If the display remains stable, you can now check the sensitivity. For EC24 for oxygen: Do not turn potentiometer "Null", unless you are sure that the transmitter is exposed to 100 % vol. nitrogen (N2).

Check of Sensitivity

! Refer to „Securing the Explosion Protection“ on page 4.

Fix a calibration adapter on the diffusion inlet for checking the sensitivity and select a suitable test gas. Then check which gas has been used for initial calibration of the transmitter. You can see this information from the test report and from the type label at the transmitter. The test gas concentration should be at least 20 % above the second alarm threshold. Please refer to the test report for the basic adjustment of alarm thresholds and full scale.

!

Handling toxic gases requires specific safety measures. Take good note of Threshold Limit Values (TLVs), which give hints for the hazards toxic gases may cause.

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Adhere to the following procedure to check the sensitivity:

yes no

Fix calibration adapter to MWG.

Is the measured value equivalent to the calibration curve?

Supply test gas to the sensor without pressure and with a flow rate of about 0.5 l/min.

Check and if necessary adjust UN value at controller. Please refer to the operation manual of your GMA control module.

For toxic gases the test gas concentration should be about 20 % b the highest alarm threshold (see test report).

For oxygen use air without interfering gases or a mixture of O2, N2, e.g. 10 % O2, as test gas.

Use potentiometer "CAL" to adjust the calibration pointand to set UM to the value seen from the calibration curve.

Open service lid at MWG.

Make sure that the alarm cannot be transmitted.

Close service lid at MWG.

Ensure that the alarm can be transmitted i

After 1 minute the MWG should read the value of the supplied concentration.

For toxic gases the voltage at UM must be 1 V for full scale deflection.

For oxygen the voltage at UM is 0.869 V in air (O2 = 20.9 Vol.-%)

Other values for UM can be seen from the calibration curve.

Remove test gas and calibration adapter.

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Service According to the German "Regulation for Explosion Protection", "BGR 500, 2.33" and DIN 31051, service stands for maintenance, inspection and repair of gas warning equipment. Regulation T023 of "BG Chemie" describes the relating measures, among others requesting a regular function check. This function check means:

• Check of zeropoint and sensitivity (calibration) • Check of response time • Check of gas sampling and gas processing system (if any) • Check of alarm signal activation • Check of failure alarm

The check must be done by an expert, who has to report the result in written form. Generally the calibration intervals should not exceed 16 weeks. The function check is to be done before putting the system in operation, and it has to be done at least once a year.

Maintenance and Inspection Maintenance and inspection mean measures which ensure the planned status of the gas monitoring system. Although the EC24 does not require a special maintenance, you should take care of some points.

• Depending on the ambient conditions, gas monitoring systems may show a different behaviour. It is important, therefore, to do a visual check every day.

• Check of gas processing system and filters (if any). • Check of gas supply for soiling or obstacles (for correct measurement the gas supply to the

sensor must not be blocked). • Electrochemical sensors are subject to ageing and exhausting. Depending on their type and

on their exposure to gas they should be replaced after a period of 12 to 24 months. A sensitivity check can only be done with a suitable test gas. The sensitivity calibration is an expert calibration and is usually done by GfG's service or by authorized persons.

Trouble Shooting Failure Reason Solution

Zeropoint cannot be adjusted Faulty sensor Replace sensor

Full scale cannot be adjusted Faulty sensor Replace sensor

Output current has fallen to 0 mA Blown fuse Cable cut

Replace fuse Re-fix connection

List of Spare Parts Part No. Service lid with screws 2401305 Casing complete 2401301 Casing top 2401302

Accessories Part No. Screw-in calibration adapter 2400209 Plug-on calibration adapter on request

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Replacing of parts or using the accessories may affect the operation as follows:

Spare Part, Accessory Effect of ambient temperature

Service lid with screws None

Casing top None

Spare sensor Adjustment of zeropoint and span

Screw-in calibration adapter None, if the flow rate is 0.5 l/min

Plug-on calibration adapter None, if the flow rate is 0.5 l/min

Detection Ranges and Gases: Gas Sensor type Detection range

Ammonia (NH3) MK393-4 0 .. 200 ppm NH3 Chlorine (Cl2) MK304-2 0 .. 5 / 20 ppm Cl2 Hydrogen chloride (HCl) MK309-2 0 .. 10 / 20 / 50 ppm HCl Hydrogen cyanide (HCN) MK336-3 0 .. 20 / 50 ppm HCN Ethylene oxide (C2H4O) MK340-2 0 .. 20 ppm C2H4O Hydrogen fluoride (HF) MK412-2 0 .. 10 ppm HF Carbon monoxide (CO) MK174-2 0 .. 100 / 200 / 300 / 600 / 1000 / 2000 ppm CO Ozone (O3) MK338-2 0 .. 3 ppm O3 Oxygen (O2) MK398-2 0 .. 25 % vol. O2 Phosgene (COCl2) MK425-2 0 .. 1 ppm COCl2 Sulphur dioxide (SO2) MK306-2 0 .. 10 / 50 ppm SO2 MK307-2 0 .. 100 ppm SO2 Hydrogen sulfide (H2S) MK176-2 0 .. 30 / 50 / 200 ppm H2S MK177-2 0 .. 1000 ppm H2S Nitrogen dioxide (NO2) MK310-2 0 .. 20 ppm NO2 Nitrogen monoxide (NO) MK179-2 0 .. 100 / 500 / 1000 ppm NO Hydrogen (H2) MK305-2 0 .. 200 / 2000 ppm H2 MK140-2 (*2) 0 .. 2 % vol. H2 (only with MWG 2413 resp. MWG 2414)

Ref. (*2): Not approved for LEL monitoring in applications for primary explosion protection.

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Sensor Specification MK140-2 Electrochemical sensor for hydrogen H2 (*2)

Response time t90: <80 sec Pressure 800...1200 hPa: max. ±0,01% vol. or ±5% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±0,01% vol. or ±10% of display (ref. to 50% r.h.) Temperature -20...+40(50)°C: max. ±0,02% vol. or ±15(20)% of display (ref. to 20°C) Cross sensitivities: HCN≈100%, H2S≈66%, C2H4≈40%, CO<40%, NO<30%, SO2=NO2=HCl=Cl2=0% (*1) Expected lifetime: 2..3 years in air

MK174-2 Electrochemical sensor for carbon monoxide CO Response time t90: <40 sec Pressure 800...1200 hPa: max. ±3ppm or ±7% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±3ppm or ±7% of display (ref. to 50% r.h.) Temperature -20...+40(50)°C: max. ±3(5)ppm or ±7(10)% of display (ref. to 20°C) Cross sensitivities H2S≈250%, C2H4<100%, SO2≈60%, H2<60%, NO2≈-60%, HCN≈50%, Cl2≈-50%, NO≈30%

(*1)Expected lifetime: 3 years in air

MK176-2 Electrochemical sensor for hydrogen sulfide H2S Response time t90: <40 sec Pressure 800...1200 hPa: max. ±1ppm or ±7% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±1ppm or ±7% of display (ref. to 50% r.h.) Temperature -20...+50°C: max. ±1ppm or ±7% of display (ref. to 20°C) Cross sensitivities: SO2<20%, Cl2≈-20%, NO2<-20%, HCN<-14%, NO<6%, CO<0,5%, H2<0,1%, HCl=0%

(*1)Expected lifetime: 2..3 years in air

MK177-2 Electrochemical sensor for hydrogen sulfide H2S Response time t90: <40 sec Pressure 800...1200 hPa: max. ±1ppm or ±7% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±1ppm or ±7% of display (ref. to 50% r.h.) Temperature -20...+50°C: max. ±1ppm or ±7% of display (ref. to 20°C) Cross sensitivities: SO2<20%, NO2≈-20%, HCN<-14%, Cl2<±5%, CO<2%, H2<0,2%, NO=HCl=0% (*1) Expected lifetime: 2..3 years in air

MK179-2 Electrochemical sensor for nitrogen monoxide NO Response time t90: <25 sec Pressure 800...1200 hPa: max. ±1ppm or ±7% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±1ppm or ±7% of display (ref. to 50% r.h.) Temperature -20...+35(50)°C: max. ±3(6)ppm or ±7% of display (ref. to 20°C) Cross sensitivities: H2S≈35%, NO2<30%, HCl <20%, SO2=CO=NO=HCN=Cl2=H2=0% (*1) Expected lifetime: 3 years in air Warm-up time: 3 minutes up to 1 day – depending on time of deactivation

MK304-2 Electrochemical sensor for chlorine Cl2 Response time t80: <70 sec Pressure 800...1200 hPa: max. ±0,2ppm or ±10% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±0,2ppm or ±10% of display (ref. to 50% r.h.) Temperature -20...+35(50)°C: max. ±0,3(0,5)ppm or ±10% of display (ref. to 20°C) Cross sensitivities: NO2≈100%, H2S<-25%, SO2 ≈-1%, H2=HCN=HCl=NO=CO=0% (*1) Expected lifetime: 2..3 years in air

MK305-2 Electrochemical sensor for hydrogen H2 (*2) Response time t90: <60 sec Pressure 800...1200 hPa: max. ± 5ppm or ±5% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ± 5ppm or ±10% of display (ref. to 50% r.h.) Temperature -20...+40(50)°C: max. ±10(20)ppm or ±20% of display (ref. to 20°C) Cross sensitivities: C2H4≈80%, NO≈30%, HCN≈30%, CO<20%, H2S<20%, SO2=NO2=Cl2=HCl=0% (*1) Expected lifetime: 2..3 years in air

MK306-2 Electrochemical sensor for sulphur dioxide SO2 Response time t90: <30 sec Pressure 800...1200 hPa: max. ±0,2ppm or ±5% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±0,2ppm or ±5% of display (ref. to 50% r.h.) Temperature -20...+50°C: max. ±0,2ppm or ±5% of display (ref. to 20°C) Cross sensitivities: H2S≈130%, NO2≈-120%, HCN≈50%, Cl2≈-50%, HCl≈20%, CO<1%, NO<-3%, H2=0% (*1) Expected lifetime: 2..3 years in air

MK307-2 Electrochemical sensor for sulphur dioxide SO2 Response time t90: <30 sec Pressure 800...1200 hPa: max. ±0,2ppm or ±5% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±0,2ppm or ±5% of display (ref. to 50% r.h.) Temperature -20...+50°C: max. ±0,2ppm or ±5% of display (ref. to 20°C) Cross sensitivities: NO2 ≈-100%, HCN<50%, Cl2≈-30%, NO=<-20%, CO <2%, H2S=HCl=H2=0% (*1) Expected lifetime: 2..3 years in air

Ref. (*1): Gas display referred to the supplied concentration of TLV Ref. (*2): Not approved for LEL monitoring in applications for primary explosion protection.

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MK309-2 Electrochemical sensor for hydrogen chloride HCl

Response time t90: <150 sec Pressure 800...1200 hPa: max. ±1ppm or ±10% of display (ref. to 1000 hPa) Humidity 10%...95% r.h.: max. ±1ppm or ±10% of display (ref. to 50% r.h.) Temperature -20...+35(50)°C: max. ±1(3)ppm or ±15(30)% of display (ref. to 20°C) Cross sensitivities: H2S≈180..300%, SO2≈30..70%, NO2<20%, Cl2≈-5..+10%, HCN<3%, CO<1%, H2<0,5%,

NO=0% (*1) Expected lifetime: 2..3 years in air Warm-up time: 10 minutes up to 7 days – depending on time of deactivation

MK310-2 Electrochemical sensor for nitrogen dioxide NO2 Response time t90: <45 sec Pressure 800...1200 hPa: max. ±0.3ppm or ±5% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±0.3ppm or ±5% of display (ref. to 50% r.h.) Temperature -20...+40(50)°C: max. ±0.3(0.5)ppm or ±5% of display (ref. to 20°C) Cross sensitivities: Cl2≈100%, H2S<-10%, SO2<1%, HCl=HCN=H2=NO=CO=0% (*1) Expected lifetime: 2..3 years in air

MK336-3 Electrochemical sensor for hydrogen cyanide HCN Response time t90: <150 sec Pressure 800...1200 hPa: Max. ±1 ppm or ±10% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: Max. ±1 ppm or ±10% of display (ref. to 50% r.h.) Temperature -20...+35(50)°C: max. ±1(3) ppm or ±15% of display (ref. to 20°C) Cross sensitivities: H2S≈350%, SO2<350%, NO2<-400%, Cl2≈-50%, NO<-50%, CO<18%, H2=0% (*1) Expected lifetime: 2 years in air

MK338-2 Electrochemical sensor for ozone O3 Response time t90: <150 sec Pressure 800...1200 hPa: max. ±0.03 ppm or ±10% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±0.03 ppm or ±10% of display (ref. to 50% r.h.) Temperature -20...+50°C: max. ±0.05 ppm or ±15% of display (ref. to 20°C) Cross sensitivities: Cl2<100%, NO2≈70%, H2S<15%, HCN=HCl=CO=NO=SO2=H2=0% (*1) Expected lifetime: 2..3 years in air

MK340-2 Electrochemical sensor for ethylene oxide C2H4O Response time t90: <150 sec Pressure 800...1200 hPa: max. ±1ppm or ±15% of display (ref. to 1000 hPa) Humidity 15%...90% r.h.: max. ±2ppm or ±15% of display (ref. to 50% r.h.) Temperature -20...+30(50)°C: max. ±1(3)ppm or ±15(20)% of display (ref. to 20°C) Cross sensitivities: CO≈40%, CH4O≈150%, C2H2≈125%, CH2O≈120%, CH4S≈100%, C2H4≈80%, C2H6O≈55%,

C7H8≈20% and others (*1) Expected lifetime: 2..3 years in air Warm-up time: 4 minutes up to 7 days – depending on time of deactivation

MK398-2 Electrochemical sensor for oxygen O2 Response time t20: <10 sec t90: <20 sec Pressure 800...1200 hPa: max. ±0.2% vol. or ±2,5% of range (ref. to 1000 hPa) Humidity 0%...99% r.h.: max. ±0.2% vol. or ±2,5% of range (ref. to 50% r.h.) Temperature -20...+40(50)°C: max. ±0.3(0.5)% vol. or ±2(4)% of display (ref. to 20°C) Expected lifetime: 2 years in air

MK412-2 Electrochemical sensor for hydrogen fluoride HF Response time t50: <40 sec t90: <90 sec Pressure 800...1200 hPa: max. ±0.2ppm or ±10% of display (ref. to 1000 hPa) Humidity 10%...80% r.h.: max. ±0.2ppm or ±10% of display (ref. to 50% r.h.) Temperature -20...+40°C: max. ±0.2ppm or ±10% of display (ref. to 20°C) Cross sensitivities: HCl≈66%, Cl2≈40%, CO=NO2=H2S=H2=0% (*1) Expected lifetime: 1..2 years in air

MK425-2 Electrochemical sensor for phosgene COCl2 Response time t90: <150 sec Pressure 800...1200 hPa: max. ±0.02ppm or ±10% of display (ref. to 1000 hPa) Humidity 10%...95% r.h.: max. ±0.02ppm or ±10% of display (ref. to 50% r.h.) Temperature -20...+40°C: max. ±0.02ppm or ±10% of display (ref. to 20°C) Cross sensitivities: ClO2≈-300%, HCl≈250%, AsH3≈90%, Cl2≈40%, O3≈12%, NO2≈-10%,

NH3=CO2=CO=CH4=0% (*1) Expected lifetime: 1..1,5 years in air

Ref. (*1): Gas display referred to the supplied concentration of TLV Ref. (*2): Not approved for LEL monitoring in applications for primary explosion protection.

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Wiring Diagram MWG EC2411 with 0.2 .. 1 mA Output

browngreen

white

4 5 6

24 V GND 0.2 – 1 mA GMA300 5 1 2 GMA011 5 1 2 GMA100 5 1 2 with BUS PCB from prod. year `97 (blue) GMA100 3 0 2 with BUS PCB up to prod. year `96

(transp.) GMA101 5 1 2 GMA41 28 29 30 GMA81 (A) 1 2 3

Wiring Diagram MWG EC2412 with 4 .. 20 mA Output brown

green 456

24 V GND

4 – 20mA GMA300 5 2 GMA101 5 2 GMA41 28 30 GMA81 (A) 1 3

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Terminal Diagram MWG EC241x

Max. load 2500 Ohm

Use shielded cable for distances of more

than 5 m

MWG 2411

18,0 V - 24,0 V

Rl

U=

4

5

6

*

I = 0,2 - 1 mA

MWG 2412

24,0 V

Rl

U=

4

5

6

I = 4 - 20 mA

Rl

Max. load 150 Ohm

Use shielded cable for distances of more than 5 m

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Technical Data

Model Type: MWG 2411, MWG 2412, MWG 2413 resp. MWG 2414

Technology

Detection principle: Electrochemical sensor Detection ranges and gases: see „Detection Ranges and Gases“

Gas supply: Diffusion Response time T90: 20...150 sec - see „Sensor Specification“

Expected sensor lifetime: 1...3 year - see „Sensor Specification“ Climate effects: see „Sensor Specification“

Electrical Connections

Supply: 10...26V dc / max. 5mA for MWG2411 / MWG2413 10...26V dc / max. 50mA for MWG2412 / MWG2414

External fuse: max. T 0.2 A see „Securing the Explosion Protection“ on page 4

Output signal: 0.2...1mA / max. load 2.5kOhm for MWG2411 / MWG2413 4...20mA / max. load 150Ohm for MWG2412 / MWG2414

Test signal: 0.2...1.0V (for calibration purposes at test socket)

Calibration

Zeropoint: with potentiometer Sensitivity: with potentiometer

Climate Conditions

for operation: -20...+50°C / 5...95% r. h. / 700...1300hPa for storage: -25...+55°C / 0...99% r. h. / 700...1300hPa

(recommended 0...+30°C) Enclosure

Material: Aluminum alloy (transmitter enclosure) Stainless steel (sensor holder)

Cable entry: Screwing PG 9 max. cross section 3 x 0.75 mm

2

Dimensions: 80 x 125 x 60 mm (WxHxD) without sensor holder 80 x 185 x 60 mm (WxHxD) with sensor holder

Weight: 980 g Protection: IP 66 (transmitter enclosure)

IP 52 (sensor holder) Approvals

Electro-Magnetic Compatibility: EN 50270 type 1 and type 2 as well as EN 55022 class B Labelling and ignition protection: Only valid for model types MWG2411 and MWG2412

as per EN 50021

II 3G EEx nR [L] IIC T6 X -20°C ≤ Ta ≤ +50°C

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Annex Transmission Characteristics

EC24 Oxygen

O2 Nitrogen dioxide NO2 *

Carbon monoxide

CO *

Carbon monoxide

CO *

Test socket MWG 241X

Output MWG 2411

Output MWG2412

Vol% ppm ppm ppm UM in V I in mA I in mA 0.0 0.0 0 0 0.20 0.20 4.0 1.4 1.5 5 10 0.24 0.24 4.8 2.8 3.0 10 20 0.28 0.28 5.6 4.2 4.5 15 30 0.32 0.32 6.4 5.6 6.0 20 40 0.36 0.36 7.2 6.9 7.5 25 50 0.40 0.40 8.0 8.3 9.0 30 60 0.44 0.44 8.8 9.6 10.5 35 70 0.48 0.48 9.6 10.9 12.0 40 80 0.52 0.52 10.4 12.1 13.5 45 90 0.56 0.56 11.2 13.4 15.0 50 100 0.60 0.60 12.0 14.6 16.5 55 110 0.64 0.64 12.8 15.9 18.0 60 120 0.68 0.68 13.6 17.1 19.5 65 130 0.72 0.72 14.4 18.2 21.0 70 140 0.76 0.76 15.2 19.4 22.5 75 150 0.80 0.80 16.0 20.6 24.0 80 160 0.84 0.84 16.8 21.7 25.5 85 170 0.88 0.88 17.6 22.8 27.0 90 180 0.92 0.92 18.4 23.9 28.5 95 190 0.96 0.96 19.2 25.0 30.0 100 200 1.00 1.00 20.0

* applies also to other gases, except oxygen

Worldwide Supplier of Gas

Detection Solutions

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154-000.08_OM_EC24.doc; Version 20. October, 2008 We reserve the right of modification

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