Operation Manual EC24 (Type MWG 2411, MWG 2412, MWG 2413 and MWG 2414) GfG GESELLSCHAFT FÜR GERÄTEBAU MBH KLÖNNESTRASSE 99 D-44143 DORTMUND TELEPHONE +49/(0)231 / 564 00 0 FAX +49/(0)231 / 516313 INFO@GFG-MBH.COM WWW.GASDETECTION.BIZ AMTSGERICHT DORTMUND HRB2742 CERTIFIED AS PER DIN EN ISO 9001:2000 ATEX QM CERTIFICATE
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 EC24 5 Mounting 6 Installation of Electrical Connections 6 Putting in Operation 7 Check of Electrical Zeropoint 7 Check of Sensitivity 8 Maintenance and repair 9 Service 10 Maintenance and Inspection 10 Trouble Shooting 10 List of Spare Parts 10 Accessories 11 Detection Ranges and Gases: 11 Sensor Specification 11 Wiring Diagram MWG EC2411 with 0.2.. 1 ma Output 13 Wiring Diagram MWG EC2412 with 4.. 20 ma Output 14 Terminal Diagram MWG EC241x 14 Technical Data 15 Annex 16 2
T Y P E L A B E L I N S I D E M E N U C H A N N E L O N F A U L T % For your Safety This operating manual points out in accordance with the law, the provision of products to the market (Product Safety Act - ProdSG), on the intended use of the product and serves to protect the safety and health of people and plants. It must be read and followed by all persons that utilise this product or use, service, maintain, and control it. This product can only perform its duties for which it is intended, when it utilised, used, maintained, serviced and controlled according to instruction given by the GfG company. The warranty provided by GfG, is not valid if it is not used, maintained, controlled or serviced according to the instructions issued by GfG. The above does not alter the information on warranty and liability in the terms and conditions of the GfG. 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 20 ppm Cl 2 A 3 1 0 0 A 2 8 0 o u t / N A 3 6 0 A 1 i n / M A 2 4 0 U A 1 2 0 F A U L T U T E S T Q U I T ME N U ME N U Evaluation Warning Measurement 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. 3
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 2014/34/EU: Labelling: II 3G EEx nr [L] IIC T6 X -20 C Ta +50 C Important for NH 3 measurement After an exposure to a NH 3 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. 4
Transmitter EC24 Design 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. 5
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 (min. 4 mm 2 ) Transmitter Cable entry e.g. steel beam 4 5 6 24V Ground 0.2.. 1 ma 4 5 6 24V Ground 4.. 20 ma Sensor Controller 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. 6
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 (U M ) 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 7
Please adhere to the following procedure to check the electrical zeropoint: Make sure that the alarm cannot be transmitted. Toxic gases Oxygen (O 2 ) Is there any interfering gas present? no yes Use calibration adapter to supply zero Zero gas means: For toxic gases: Air without interfering gas For oxygen: 100 Vol. % nitrogen (N 2 ) Open service lid at MWG. Connect voltmeter to UM plug (fig. 4). Is UM = 0.2 V? yes no Use potentiometer NULL to adjust the zeropoint until UM = 0.2 V. Close service lid at MWG. Check and if necessary adjust UN at the GMA controller. Please refer to the operation manual of your GMA controller! Ensure that alarms are transmitted again. 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 (N 2 ). 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. 8
Adhere to the following procedure to check the sensitivity: Make sure that the alarm cannot be transmitted. Fix calibration adapter to MWG. Open service lid at MWG. Supply test gas to the sensor without pressure and with a flow rate of about 0.5 l/min. 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 O 2, N 2, e.g. 10 % O2, as test gas. 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. Is the measured value equivalent to the calibration curve? yes no Use potentiometer "CAL" to adjust the calibration point and to set UM to the value seen from the calibration curve. Check and if necessary adjust UN value at controller. Please refer to the operation manual of your GMA control module. Remove test gas and calibration adapter. Close service lid at MWG. Ensure that the alarm can be transmitted i Maintenance and repair The maintenance and servicing includes regular visual inspection, functional check and the system control as well as the repair of the gas warning system. In Germany the following applies: "DGUV Information 213-056 (data sheet T 021 / previously BGI 836 section 9)" and "DGUV Information 213-057 (data sheet T 023 / previously BGI 518 section 9)". The functional check can be carried out at intervals dependent on the risk of the gas to be monitored. For gas detection systems used for explosion protection, there should be a control period of 4 months, for the measurement of toxic gases and oxygen 6 months, according to the regulations T 021 and T 023 of the Employer's Liability Insurance Association BG RCI. This includes the following activities: - Visual inspection - Triggering the alarm thresholds - Triggering of test functions for display elements, visual and audible signalling device without triggering the switching functions 9
- Check of stored messages, malfunctions and maintenance requirements The repair includes all repair and replacement work. They may only be performed by the manufacturer and by persons who have been authorised by the manufacturer GfG Gesellschaft für Gerätebau mbh. Only approved and released original spare parts from the manufacturer as well as original components may be used. 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 10
Accessories Part No. Screw-in calibration adapter 2000271 Plug-on calibration adapter MK398-2 Replacing of parts or using the accessories may affect the operation as follows: on request Spare Part, Accessory Service lid with screws Casing top Spare sensor Screw-in calibration adapter Plug-on calibration adapter Effect of ambient temperature None None Adjustment of zeropoint and span None, if the flow rate is 0.5 l/min None, if the flow rate is 0.5 l/min Detection Ranges and Gases: Gas Sensor type Detection range Ammonia (NH 3 ) MK393-4 0.. 200 ppm NH 3 Chlorine (Cl 2 ) MK304-2 0.. 5 / 20 ppm Cl 2 Hydrogen chloride (HCl) MK309-2 0.. 10 / 20 / 50 ppm HCl Hydrogen cyanide (HCN) MK336-3 0.. 20 / 50 ppm HCN Ethylene oxide (C 2 H 4 O) MK340-2 0.. 20 ppm C 2 H 4 O Hydrogen fluoride (HF) MK412-2 0.. 10 ppm HF Carbon monoxide (CO) MK448-2 0.. 100 / 200 / 300 / 600 / 1000 / 2000 ppm CO Ozone (O 3 ) MK397-2 0.. 3 ppm O 3 Oxygen (O 2 ) MK398-2 0.. 25 % vol. O 2 Phosgene (COCl 2 ) MK425-2 0.. 1 ppm COCl 2 Sulphur dioxide (SO 2 ) MK306-2 0.. 10 / 50 ppm SO 2 MK307-2 0.. 100 ppm SO 2 Hydrogen sulfide (H 2 S) MK446-2 0.. 30 / 50 / 200 ppm H 2 S MK447-2 0.. 1000 ppm H 2 S MK419-0 0.. 4000 / 10000 ppm H 2 S Nitrogen dioxide (NO 2 ) MK310-2 0.. 20 ppm NO 2 Nitrogen monoxide (NO) MK179-2 0.. 100 / 500 / 1000 ppm NO Hydrogen (H 2 ) MK305-2 0.. 200 / 2000 ppm H 2 MK140-2 (*2) 0.. 2 % vol. H 2 (only with MWG 2413 resp. MWG 2414) Ref. (*2): Not approved for LEL monitoring in applications for primary explosion protection. Sensor Specification MK140-2 Electrochemical sensor for hydrogen H 2 (*2) 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) MK179-2 Electrochemical sensor for nitrogen monoxide NO 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) 3 years in air Warm-up time: 3 minutes up to 1 day depending on time of deactivation MK304-2 Electrochemical sensor for chlorine Cl 2 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) 11
MK305-2 Electrochemical sensor for hydrogen H 2 (*2) 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) MK306-2 Electrochemical sensor for sulphur dioxide SO 2 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) MK307-2 Electrochemical sensor for sulphur dioxide SO 2 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) MK309-2 Electrochemical sensor for hydrogen chloride HCl 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) Warm-up time: 10 minutes up to 7 days depending on time of deactivation MK310-2 Electrochemical sensor for nitrogen dioxide NO 2 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) MK336-3 Electrochemical sensor for hydrogen cyanide HCN 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) 2 years in air MK340-2 Electrochemical sensor for ethylene oxide C 2H 4O 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) Warm-up time: 4 minutes up to 7 days depending on time of deactivation MK393-4 Electrochemical sensor for Ammonia NH 3 t90 <60 sec Pressure 80...120hPa: max. ±1ppm or ±10% of display (ref. to 100kPa) Humidity 10%...95%r.h.: max. ±1ppm or ±10% of display (ref. to 50%r.F.) Temperature -(20)10...+40 C: max. ±1(2)ppm or ±15% of display (ref. to 20 C) Cross sensitivities: H2S 10%, CO=CO2=H2=0% (*1) MK397-2 Electrochemical sensor for Ozone O 3 t90 <150 sec Pressure 80...120hPa: max. ±0,03 ppm or ±10% of display (ref. to 100kPa) Humidity 15%...90%r.h.: max. ±0,03 ppm or ±10% of display (ref. to 50%r.F.) Temperature -20...+50 C: max. ±0,05 ppm or ±15% of display (ref. to 20 C) Cross sensitivities: ClO2 200%, NO2 80%, H2S -70%, Cl2 60%, SO2-50%, CO<0,1% (*1) MK398-2 Electrochemical sensor for Oxygen O 2 t20 <10 sec t90 <20 sec Pressure 80...120hPa: max. ±0,2Vol.% or ±2,5% of measuring range (ref. to 100kPa) Humidity 0%...99%r.h.: max. ±0,2Vol.% or ±2,5% of measuring range (ref. to 50%r.F.) Temperature -20...+40(50) C: max. ±0,3(0,5)Vol.% or ±2(4)% of display (ref. to 20 C) 2 years in air t20 <10 sec t90 <20 sec MK412-2 Electrochemical sensor for Hydrogen Fluoride HF t50 <40 sec t90 <90 sec Pressure 80...120hPa: max. ±0,2ppm or ±10% of display (ref. to 100kPa) Humidity 10%...80%r.h.: max. ±0,2ppm or ±10% of display (ref. to 50%r.F.) 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) 1..2 years in air MK419-0 Electrochemical sensor for Hydrogen Sulfide H 2S t90 <90 sec Pressure 75...125hPa: partialdruckunabhängig Humidity 15%...90%r.h.: no Data Temperature 0...+50 C: no Data Cross sensitivities: SO2=100%, NO2=0%, NO=0%, CO=0% (*1) 2 years in air Ref. (*1): Gas display referred to the supplied concentration of TLV 12
Ref. (*2): Not approved for LEL monitoring in applications for primary explosion protection. MK425-2 Electrochemical sensor for phosgene COCl 2 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) 1..1,5 years in air MK446-2 Electrochemical sensor for Hydrogen Sulfide H 2S t90 <40 sec Pressure 80...120hPa: max. ±1ppm or ±7% of display (ref. to 100kPa) Humidity 15%...90%r.h.: max. ±1ppm or ±7% of display (ref. to 50%r.F.) Temperature -20...+50 C: max. ±1ppm or ±7% of display (ref. to 20 C) Cross sensitivities: SO2<20%, NO2<±10%, NO<2%, CO<1%, H2<0,2%, CO2=Cl2=C2H4=0% (*1) MK447-2 Electrochemical sensor for Hydrogen Sulfide H 2S t90 <40 sec Pressure 80...120hPa: max. ±1ppm or ±7% of display (ref. to 100kPa) Humidity 15%...90%r.h.: max. ±1ppm or ±7% of display (ref. to 50%r.F.) Temperature -20...+50 C: max. ±1ppm or ±7% of display (ref. to 20 C) Cross sensitivities: SO2<20%, NO2<±10%, CO<2%, NO<2%, H2<0,2%, CO2=Cl2=C2H4=0% (*1) 3 years in air MK448-2 Electrochemical sensor for Carbon Monoxide CO t90 <30 sec Pressure 80...120hPa: max. ±3ppm or ±7% of display (ref. to 100kPa) Humidity 15%...90%r.h.: max. ±3ppm or ±7% of display (ref. to 50%r.F.) Temperature -20...+40(50) C: max. ±3(5)ppm or ±7(10)% of display (ref. to 20 C) Cross sensitivities: C2H4<90%, H2<60%, NO<20%, NO2-10%, H2S<1%, SO2=Cl2=0% (*1) 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. Wiring Diagram MWG EC2411 with 0.2.. 1 ma Output brown green w hite 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 13
Wiring Diagram MWG EC2412 with 4.. 20 ma Output brown green 4 5 6 24 V GND 4 20mA GMA300 5 2 GMA101 5 2 GMA41 28 30 GMA81 (A) 1 3 Terminal Diagram MWG EC241x 4 U= 18,0 V - 24,0 V * 5 MWG 2411 Rl I = 0,2-1 ma 6 Max. load 2500 Ohm Use shielded cable for distances of more than 5 m Rl 4 U= 24,0 V Rl I = 4-20 ma 5 MWG 2412 6 Max. load 150 Ohm Use shielded cable for distances of more than 5 m 14
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 T 90 : 20...150 sec - see Sensor Specification Expected sensor lifetime: 1...3 year - see Sensor Specification Climate effects: see Sensor Specification Electrical Connections Calibration Climate Conditions Enclosure 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) Zeropoint: with potentiometer Sensitivity: with potentiometer 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) 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) Cable connector: Cable gland PG 9 max. core cross-section 3x0,75mm 2 Cable type and length: LIYCY 3x0,75mm 2 to 1000m for MWG2411 / MWG2413 LIYCY 2x0,75mm 2 to 1000m for MWG2412 / MWG2414 Approvals Electro-Magnetic Compatibility: DIN EN 50270:2006 Interference: Type class I Immunity: Type class II Labelling and ignition protection: Only valid for model types MWG2411 and MWG2412 II 3G Ex nr ic IIC T6 X Gc -20 C Ta +50 C 15
Annex Transmission Characteristics EC24 Oxygen O 2 Nitrogen dioxide Carbon monoxide Carbon monoxide Test socket MWG 241X Output MWG 2411 Output MWG2412 NO 2 * CO * CO * Vol% ppm ppm ppm U M 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 154-000.08_OM_EC24.doc; Version 25 th October 2017 We reserve the right of modification Gesellschaft für Gerätebau mbh Klönnestraße 99, D-44143 Dortmund Phone: +49-231-56400-0 Fax: +49-231-516313 E-Mail: info@gfg-mbh.com Internet: www.gasdetection.biz 16
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