General Monitors S4000T Instruction Manual Download Page 48

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Model S4000T

8.3.2 Modbus Read Response Message

Byte Modbus

Range

Referenced to S4000T

Slave Address

1-247* (Decimal)

S4000T ID (Address)

Function Code

Read Holding Registers

Byte Count

No. Of Data Bytes

Data Hi

00-FF (Hex)

S4000T Hi Byte Status Data

Data Lo

00-FF (Hex)

S4000T Lo Byte Status Data

CRC Lo

00-FF (Hex)

CRC Lo Byte

CRC Hi

00-FF (Hex)

CRC Hi Byte

8.4 Modbus

Write

Command

Protocol (Query/Response)

8.4.1 Modbus Write Query Message

Byte Modbus

Range

Referenced to S4000T

Slave Address

1-247* (Decimal)

S4000T ID (Address)

Function Code

Preset Single Register

Not Used by S4000T

(Hex)

S4000T

Commands

Preset Data Hi

00-FF (Hex)

S4000T Hi Byte Command Data

Preset Data Lo

00-FF (Hex)

S4000T Lo Byte Command Data

CRC Lo

00-FF (Hex)

CRC Lo Byte

CRC Hi

00-FF (Hex)

CRC Hi Byte

*NOTE -

Address 0 is reserved for broadcast mode and will not be supported at this

time.

**NOTE -

Start Address can be a maximum of 9999 Address Locations (0000-270E).

8.4.2 Modbus Write Response Message

Byte Modbus

Range

Referenced to S4000T

Slave Address

1-247* (Decimal)

S4000T ID (Address)

Function Code

Preset Single Register

Not Used by S4000T

(Hex)

S4000T

Commands

Preset Data Hi

00-FF (Hex)

S4000T Hi Byte Command Data

Preset Data Lo

00-FF (Hex)

S4000T Lo Byte Command Data

CRC Lo

00-FF (Hex)

CRC Lo Byte

CRC Hi

00-FF (Hex)

CRC Hi Byte

8.5 Function Codes Supported

Function Code 03 (Read Holding Registers) will be used to read status from the slave
unit.
Function Code 06 (Preset Single Register) will be used to write a command to the
slave unit.

Summary of Contents for S4000T

Page 1: ...in this document may be used and disseminated only for the purposes and to the extent specifically authorized in writing by General Monitors Instruction Manual 03 03 General Monitors reserves the right to change published specifications and designs without prior notice MANS4000T Part No MANS4000T Revision F 03 03 ...

Page 2: ...ensor All warranties are contingent upon proper use in the application for which the product was intended and does not cover products which have been modified or repaired without General Monitors approval or which have been subjected to neglect accident improper installation or application or on which the original identification marks have been removed or altered Except for the express warranty st...

Page 3: ... any factory specified warm up period to the safety system verify that all signal outputs to and from devices and modules are within the manufacturers specifications Initial calibration calibration checking testing should be performed per the manufacturers recommendations and instructions Proper system operation should be verified by performing a full functional test of all component devices of th...

Page 4: ...ted to Power supplies Control modules Field detection devices Signaling output devices Accessories connected to field and signaling devices Proper system operation should be verified by performing a full functional test of all component devices of the safety system ensuring that the proper levels of alarming occur Fault Malfunction circuit operation should be verified Calibration intervals should ...

Page 5: ...e the Model S4000T near possible sources of gas leaks Observe the Model S4000T s temperature specification and locate the unit away from concentrated sources of heat Transmitters should be mounted in an area that is as free from wind dust water shock and vibration as possible See Section 9 2 4 for the environmental specifications of the unit If the sensor can not be located away from dust and rain...

Page 6: ... Section 9 5 for FMRC approval requirements 1 2 Mounting and Wiring 1 2 1 Tools Required 1 5mm Allen head wrench to remove enclosure lid included with gas detector 2 Flat head screwdriver maximum 3 16 5 mm width for terminal block connections included with gas detector 3 Adjustable wrench for conduit or cable gland connections not included WARNING The conduit entries should be sealed per the NEC 5...

Page 7: ...tly installed the Model S4000T requires little or no maintenance other than periodic calibration checks to ensure system integrity General Monitors recommends that a schedule be established and followed NOTE The system s full two year warranty will be voided if customer personnel or third parties damage the system during repair attempts Sensor heads exposed to the elements may require lubrication ...

Page 8: ...ics or sensor may result 1 3 2 Terminal Block TB2 Power and Signal Connections TB2 contains the connections for Power Relay Reset Remote Calibration Modbus and 0 20mA Output Signal The terminal connections are as follows TB2 position Function 1 0 20mA Output 2 CH1 Modbus 3 CH1 Modbus 4 CH2 Modbus 5 CH2 Modbus 6 Remote Calibration 7 Relay Reset 8 Ground 9 24VDC Power Figure 2 Power and Signal Conne...

Page 9: ...Model S4000T but need a customer supplied DC source DT210 Eight Channel Readout Relay Display Module without a Power Supply Relay Module DT220 Dual Channel Display Module TA202A Trip Amplifier Module without a PS002 Since the Model S4000T is designed to operate continuously a power switch is not included in order to prevent accidental system shutdown NOTE Power must remain disconnected until all o...

Page 10: ...4 AWG wire to A General Monitors readout relay display module or An industrial analog to digital converter or A computer based monitor A PLC or A DCS To connect the 4 to 20mA output signal with another unit connect the wire into TB2 position 1 labeled 4 20mA For making output signal connections to display devices refer to the specific manual for that device Figure 7 FROM TO Model S4000T Model DT21...

Page 11: ...ure 8 Alarm Relay Connections TB3 position Relay Contact De Energized Relay Contact Energized 4 Normally Closed Normally Open 5 Common Common 6 Normally Open Normally Closed Figure 9 Warn Relay Connections TB3 position Relay Contact Energized 7 Normally Open 8 Common 9 Normally Closed Figure 10 Fault Relay Connections NOTE Fault relay is normally energized Relay will change states after power up W...

Page 12: ...instrument earth in the safe area The power supply OV return must be connected to an instrument earth in the safe area The interconnecting cables should be segregated from power and other noisy cables Avoid proximity to cables associated with radio transmitters welders switch mode power supplies inverters battery chargers ignition systems generators switch gear arc lights and other high frequency ...

Page 13: ...er to the Trouble Shooting Section or call the factory direct Worldwide Service is available by calling Lake Forest California Phone 1 949 581 4464 24 hr service Fax 1 949 581 1151 Houston Texas Phone 1 281 855 6000 Fax 1 281 855 3290 Ireland Phone 353 91 751175 Fax 353 91 751317 Singapore Phone 65 6748 3488 Fax 65 6748 1911 United Arab Emirates Phone 971 4 8815751 Fax 971 4 8817927 United Kingdom...

Page 14: ...nnections x 1 3 6 European Union EU Approved Applications xi Table of Contents xiii Table of Figures xvii 2 0 Introduction 1 2 1 General Description 1 3 0 Installation 2 3 1 Receipt of Equipment 3 3 2 Tools Required 3 3 3 Choosing Product Locations 4 3 3 1 Remote mounting of the Sensor from the Electronics 5 3 4 Mounting and Wiring 6 3 5 Terminal Connections 8 3 5 1 Terminal Block TB1 Sensor Conne...

Page 15: ...emaining Sensor Life 22 4 6 4 Initializing the Remaining Sensor Life 22 4 7 Calibration Equipment 23 4 7 1 Breaker Bottles and Ampoules 23 4 7 2 H2S Portable Purge Calibrator 23 5 0 Maintenance 24 5 1 General Maintenance 24 5 2 Storage 24 6 0 Troubleshooting 25 6 1 Fault Codes Their Remedies 25 6 1 1 F2 Failed to Complete the Calibration 25 6 1 2 F3 EPROM Checksum Error 25 6 1 3 F4 Sensor Heater O...

Page 16: ...er Locations 33 8 8 S4000T Command Register Details 34 8 8 1 Analog 34 8 8 2 Mode 34 8 8 3 Status Error 35 8 8 4 Unit Type 35 8 8 5 Software Revision 35 8 8 6 Status Block 35 8 8 7 Alarm Settings 35 8 8 8 Warn Settings 36 8 8 9 Com1 Address 36 8 8 10 Com1 Baud Rate 37 8 8 11 Com1 Data Format 37 8 8 12 Com2 Address 37 8 8 13 Com2 Baud Rate 37 8 8 14 Com2 Data Format 38 8 8 15 Reset Alarms 38 8 8 16...

Page 17: ... 42 9 2 3 Electrical Specifications 42 9 2 4 Environmental Specifications 43 9 3 Approvals 43 9 4 Spare Parts and Accessories 43 9 4 1 Sensors 44 9 4 2 Sensor Housing 44 9 4 3 Sensor Accessories 44 9 4 4 Calibration Equipment 44 9 4 5 Intelligent Sensor S4000T Replacement Parts 45 9 4 6 Recommended Spare Parts for One 1 Year 45 9 5 FMRC Approval45 ...

Page 18: ...ire Strip Length 9 Figure 17 Ground or Common Connections 10 Figure 18 Power Connections 10 Figure 19 Analog Signal Connections 11 Figure 20 Alarm Relay Connections 11 Figure 21 Warn Relay Connections 11 Figure 22 Fault Relay Connections 11 Figure 23 Relay Protection for DC and AC Loads 12 Figure 24 Relay Reset 16 Figure 25 User Menu Structure 17 Figure 26 Gas Check 20 Figure 27 Automatic Calibrat...

Page 19: ...ow in the cover A red LED above the digital display signifies an ALARM condition while a red LED below the digital display signifies a WARN condition Analog signal 4 20mA optional Dual Redundant Modbus communications and relays provide remote and or discrete indications of the sensor s operation The model S4000T Intelligent Sensor is rated explosion proof for use in the following hazardous areas C...

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Page 21: ...number and serial number Each unit is tested by the factory however a complete system check out is suggested upon initial installation to ensure system integrity WARNING Installation and Maintenance must be carried out by suitably skilled and competent personnel only WARNING The Model S4000T Intelligent Sensor contains components which can be damaged by static electricity Special care must be take...

Page 22: ...ure to certain materials Loss of sensitivity or corrosion may be gradual if such materials are present in low concentrations or it may be rapid at high concentrations The more important materials adversely affecting sensors are Silicones often contained in greases and aerosols Halides compounds containing Fluorine Chlorine Bromine and Iodine Heavy metals e g Tetraethyl Lead Caustic and Acidic liqu...

Page 23: ...the housing the maximum distance can be no greater than 3700 feet 1125 meters using 14 AWG wire Sensors that are remotely mounted must be placed in an explosion proof rated sensor housing GM P N 10252 and the cable run must be contained in a conduit running from the sensor housing to the electronics See Section 9 5 for FMRC approval requirements ...

Page 24: ...from a hazardous location to a non hazardous location should be sealed so that gases vapors and or flames can not pass beyond the seal The purpose of seals in a Class I hazardous location is to prevent the passage of gases vapors or flames from one electrical installation to another through the conduit system It is not necessary to seal the Model S4000T housing to maintain its explosion proof inte...

Page 25: ...t not be used As an alternate PTFE teflon tape may be used on sensor accessory threads NOTE Do not use any material or substance on threads that contact the sensor housing The removal of particulate matter from sensor accessories may be done through the use of an appropriate halogen free solvent Water or Ethanol are examples of suitable solvents The accessories should be thoroughly dried with comp...

Page 26: ...res from the sensor to the matching colored terminals on TB1 The label on the inside of the cover can serve as a guide Replace the display board by pressing it into place and tightening the two captive screws WARNING Do not connect 24VDC to TB1 Damage to the electronics or sensor may result 3 5 2 Terminal Block TB2 Power and Signal Connections TB2 contains the connections for Power Relay Reset Rem...

Page 27: ...s carefully stripped Figure 16 3 5 3 DC Power and Ground Connections Primary DC power must be provided by the customer unless one of the following General Monitors Modules is being used with the Model S4000T DT210 Eight Channel Readout Relay Display Module with Power Supply Relay Module DT230 Dual Channel Readout Relay Display Module TA202A Trip Amplifier Module with a PS002 The following General ...

Page 28: ...A202A TB2 9 24 VDC Rear CH 1 8 24V Rear Pin 4 or 7 DC OUT Rear Pin 28d or 28z Figure 18 Power Connections 3 5 4 Analog Signal Connections A 4 to 20mA output signal is provided by the Model S4000T Intelligent Transmitter This signal can be sent up to 9000 feet 2740 meters to A General Monitors readout relay display module or An industrial analog to digital converter or A computer based monitor A PL...

Page 29: ...y Open NO and the Normally Closed NC contact TB3 position Relay Contact De Energized Relay Contact Energized 1 Normally Closed Normally Open 2 Common Common 3 Normally Open Normally Closed Figure 20 Alarm Relay Connections TB3 position Relay Contact De Energized Relay Contact Energized 4 Normally Closed Normally Open 5 Common Common 6 Normally Open Normally Closed Figure 21 Warn Relay Connections ...

Page 30: ...nected to an instrument earth in the safe area The power supply OV return must be connected to an instrument earth in the safe area The interconnecting cables should be segregated from power and other noisy cables Avoid proximity to cables associated with radio transmitters welders switch mode power supplies inverters battery chargers ignition systems generators switch gear arc lights and other hi...

Page 31: ...acing the cover This can be verified by tightening the cover bolts to a torque setting of 50 inch pounds or by using a feeler gauge to ensure the gap between the cover and the housing is less than 0015 inch 038 mm There are four entry holes one each on the left and right sides and two on the bottom of the Model S4000T housing These holes are dedicated for the sensor the reset switch and conduit Ea...

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Page 33: ...cked for correctness and the housing cover replaced Upon first power up the sensor may take up to fifteen minutes to stabilize At the initial application of power the unit will test all of the LED segments by displaying 88 8 The software revision letter will then be displayed for a few seconds The unit will then enter Operational Mode and the current gas concentration at the sensor will be display...

Page 34: ...4 4 User Selectable Options The Model S4000T Intelligent Sensor includes many selectable options to provide the user with the most flexible H2S gas detector possible These options include Selectable Sensor Range Warn and Alarm Relay Setpoints and Configuration and Modbus Communications Settings These allow the unit to operate with a wide variety of PLC and DCS Systems The following sections explai...

Page 35: ...tedly until the desired range is displayed Once the desired range is displayed wait 3 seconds and Fi will be displayed Apply and remove the magnet to return to the next level of the Setup menu When Fi is displayed again apply and remove the magnet to return to normal operation Operate rSt AC SE Fi Reset Relays Enter Calibration Mode N N N Enter Gas Check Mode Apply Gas and Remove when complete Gas...

Page 36: ... again apply and remove the magnet to return to normal operation The default Warning relay settings are non latching de energized 30 FS setpoint The maximum allowable setpoint is 50ppm NOTE The Warn Relay setpoint cannot be set higher than the Alarm Relay setpoint 4 4 4 Alarm Relay Settings To adjust the Alarm Relay Settings of the Model S4000T apply the magnet to the GM Logo on the cover of the u...

Page 37: ...displayed again apply and remove the magnet to return to normal operation Default settings for Channel 1 are address 1 19 2 kbaud 8 N 1 NOTE The address can be adjusted from 1 247 Channel 1 and Channel 2 addresses may be the same 4 4 6 Modbus Channel 2 Settings To adjust the Modbus Channel 2 Settings of the Model S4000T apply the magnet to the GM Logo on the cover of the unit until SE is displayed...

Page 38: ...g display and should stabilize in one to two minutes Figure 26 Gas Check When the reading has stabilized and the test is complete remove the gas and the unit will return to normal operation when the concentration drops below 5 full scale If after the reading has stabilized the sensor is to be calibrated simply apply the magnet to the GM Logo on the housing cover and the unit will enter Calibration...

Page 39: ...or replacement 4 6 1 Calibration Procedure If Hydrogen Sulfide H2S gas is suspected to be present it will be necessary to purge the sensor environment with clean air Entering Calibration Mode automatically disables the alarm circuits by sending a 1 5mA output signal and disabling the Warn and Alarm relays if present This will also prevent activation of the remote relay contacts when using a Genera...

Page 40: ...f remaining sensor life in percent remaining to provide the user with an early warning of the need for sensor replacement The remaining sensor life is updated each time the unit is calibrated The current remaining sensor life estimate is displayed during the zeroing portion of a calibration sequence It can also be read via the Modbus interface see Section 8 NOTE The remaining sensor life provides ...

Page 41: ...ations The temperature limitation for operation and storage is 0 F to 130 F 18 C to 54 C NOTE Do not store the cylinder with the regulator fully engaged in the cylinder valve Use the calibration procedure listed below for H2S Portable Purge calibrations Make sure the Portable Purge Calibrator contains a gas concentration equivalent to 50 of full scale for the unit that is going to be calibrated En...

Page 42: ...EFA Health Safety Executive component approval No 1051U for use as a jointing compound on flameproof electrical enclosures This is available from General Monitors The neoprene rubber gasket should also be lubricated with Type P80 lubricant available from General Monitors P N 610 010 5 2 Storage The Model S4000T H2S Gas Detector should be stored in a clean dry area and within the temperature and hu...

Page 43: ...s has been applied within twelve minutes or if gas has been left on for more than 12 minutes ACTION Remove gas if present Apply magnet to GM Logo on the cover to clear fault Re calibrate if necessary 6 1 2 F3 EPROM Checksum Error This fault indicates that the contents of the Model S4000T s program memory have changed This usually occurs when powering the unit up after a lightning strike or large v...

Page 44: ...the unit is left in setup mode for more than 6 minutes ACTION Exit setup mode Enter setup mode again if it is necessary to change any user selectable options 6 1 8 F9 Gas Check Period Exceeded If the Model S4000T is left in the gas check mode for more than twelve minutes with Test Gas applied this fault will occur ACTION Place the magnet over the GM Logo on the cover to return the unit to normal o...

Page 45: ... Heather Close Lyme Green Business Park Macclesfield Cheshire United Kingdom SK11 0LR Phone 44 1625 619 583 Fax 44 1625 619 098 Email info generalmonitors co uk IRELAND Ballybrit Business Park Galway Republic of Ireland Phone 353 91 751175 Fax 353 91 751317 Email service gmil ie SINGAPORE No 2 Kallang Pudding Rd 09 16 Mactech Building Singapore 349307 Phone 65 6748 3488 Fax 65 6748 1911 Email genm...

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Page 47: ...rmat 8 3 Modbus Read Status Protocol Query Response 8 3 1 Modbus Read Query Message Byte Modbus Range Referenced to S4000T 1st Slave Address 1 247 Decimal S4000T ID Address 2nd Function Code 03 Read Holding Registers 3rd Starting Address Hi 00 Not Used by S4000T 4th Starting Address Lo 00 FF Hex S4000T Commands 5th No Of Registers Hi 00 Not Used by S4000T 6th No Of Registers Lo 01 No Of 16 Bit Reg...

Page 48: ...mmand Data 6th Preset Data Lo 00 FF Hex S4000T Lo Byte Command Data 7th CRC Lo 00 FF Hex CRC Lo Byte 8th CRC Hi 00 FF Hex CRC Hi Byte NOTE Address 0 is reserved for broadcast mode and will not be supported at this time NOTE Start Address can be a maximum of 9999 Address Locations 0000 270E 8 4 2 Modbus Write Response Message Byte Modbus Range Referenced to S4000T 1st Slave Address 1 247 Decimal S4...

Page 49: ...entually process a timeout condition for the query In order to prevent this condition from occurring the maximum response time for the S4000T is 200 milliseconds Therefore the master s timeout setting should be set to 200 milliseconds or greater 4 If the S4000T receives the query without a communications error but cannot process it due to reading or writing to a non existent S4000T command registe...

Page 50: ...t an allowable value for the S4000T 04 Slave Device Failure An unrecoverable error occurred while the S4000T was attempting to perform the requested action 05 Acknowledge The S4000T has accepted the request and is processing it but a long duration of time will be required to do so This response is returned to prevent a timeout error from occurring in the master 06 Device Busy The S4000T is engaged...

Page 51: ...ge settings for the Com1 Baud Rate Bit 0 7 R W 0010 40017 Com1 Data Format Read or change settings for the Com1 Data Format Bit 0 7 R W 0011 40018 Com2 Addr Read or change settings for the Com2 Address Value 8 Bit R W 0012 40019 Com2 Baud Read or change settings for the Com2 Baud Rate Bit 0 7 R W 0013 40020 Com2 Data Format Read or change settings for the Com2 Data Format Bit 0 7 R W 0014 40021 No...

Page 52: ... value which is proportional to the 0 20mA output current The current is based on a 16 bit value The scaling is 0 65535 decimal which corresponds to 0 21 7mA 8 8 2 Mode A read returns the present mode of the S4000T A write command changes the mode to the requested mode Exception Returns an Exception Code 01 illegal function if an illegal write is requested A calibrate command returns an Exception ...

Page 53: ...tware revision of the S4000T in 2 ASCII characters 8 8 6 Status Block A read returns a 6 byte message containing the analog 2 bytes Mode 1 byte Status Error 2 bytes and Sensor Life 1 byte in that order For the format of each byte refer to the appropriate individual commands 8 8 7 Alarm Settings A read returns the present Alarm settings of the S4000T A write command changes the settings to the requ...

Page 54: ...s normally energized a 0 means it is normally De Energized The Warn setpoint cannot be set above the Alarm setpoint Factory default is 30 FS non latching de energized The maximum allowable setpoint is 50ppm Exception Returns an Exception Code 01 illegal function if an illegal write is requested Byte Function Bit Position Access High Not Used 15 MSB Read Not Used 14 Read Not Used 13 Read Not Used 1...

Page 55: ... 1 8 N 1 0 Read Write 8 Even 1 8 E 1 1 Read Write 8 Odd 1 8 O 1 2 Read Write 8 None 2 8 N 2 3 Read Write Figure 33 Com1 Data Format Exception If the data format is not in range an illegal data value 03 is returned 8 8 12 Com2 Address A read command returns the current address for Com2 A write command changes the address to the requested values Valid addresses are 1 247 decimal Factory default is 2...

Page 56: ... sensor scale selected 0 20ppm 0 50ppm 0 100ppm A write changes the scale to the desired scale If the scale is changed a calibration fault is generated forcing the operator to calibrate the unit H2S Sensor Scale Value decimal 0 20 ppm 20 0 50 ppm 50 0 100 ppm 100 Figure 36 Sensor Scale 8 8 18 Total Receive Errors A read indicates the total Modbus Comm Receive Errors that occurred in the slave devi...

Page 57: ...e slave device The maximum count is 255 and then the counter will rollover to zero and begin counting again 8 8 23 RXD CRC Hi Errors A read indicates the number of RXD CRC Hi Byte Errors that occurred in the slave device The maximum count is 255 and then the counter will rollover to zero and begin counting again 8 8 24 RXD CRC Low Errors A read indicates the number of RXD CRC Low Byte Errors that ...

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Page 59: ... an elevated temperature On the outer edge of the substrate is a heater ring The temperature of this heater ring is measured with a thermistor and kept constant by a circuit located inside the body of the sensor As H2S adsorbs onto the film electrons move more freely from one electrode to the other This is represented as a decrease in resistance The process of H2S adsorbing onto the MOS film is co...

Page 60: ...it digital display with gas concentration Warn and Alarm LED s calibration prompts fault codes and setup options RS 485 Output Dual Redundant Modbus RTU suitable for linking up to 128 units or up to 247 units with repeaters Baud Rate 2400 4800 9600 or 19200 BPS Faults Monitored Open AO calibration error sensor heater error low DC supply EEPROM EPROM setup error gas check time exceeded switch error...

Page 61: ... Specifications Operating Temperature Range CSA FM Electronics 40 F to 167 F 40 C to 75 C Standard Sensor 65 F to 195 F 55 C to 90 C CENELEC Electronics T5 40 F to 158 F 40 C to 70 C Electronics T6 40 F to 104 F 40 C to 40 C Storage Temperature Range 58 F to 185 F 50 C to 85 C Operating Humidity Range 5 to 100 RH non condensing 9 3 Approvals CSA and CENELEC Approved FM CE and ATEX Marking pending ...

Page 62: ...Replaceable Screens Box of 12 10395 1 Splash Guard Assembly 10110 1 Dust Guard Assembly 1800822 Dust Guard Sintered SST 9 4 4 Calibration Equipment 50000 Breaker Bottle Single 50004 3 Individual Ampoules 10 ppm 12 minimum 50004 21 Individual Ampoules 25 ppm 12 minimum 50004 13 Individual Ampoules 50 ppm 12 minimum 50008 9 12 Ampoules at 50ppm 0 100ppm scale 50008 16 12 Ampoules at 25ppm 0 50ppm sc...

Page 63: ...o maintain FMRC approved system the control instrument to which the subject instrument is connected must also be FMRC approved The following sensors have been FMRC approved for use with the Model S4000T 50445 1 Aluminum Body H2S Gas Specific MOS Sensor 0 to 100 ppm 50445 5 Aluminum Body H2S Gas Specific MOS Sensor 0 to 50 ppm 50445 9 Aluminum Body H2S Gas Specific MOS Sensor 0 to 20 ppm 50448 1 St...

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