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M2A Transmitter Operator’s Manual

61

Chapter 8: RS-485 Modbus Output

Overview

This chapter describes the M2A’s RS-485 Modbus output and how to configure the M2A to make use of it. It also
discusses how to wire the M2A into a Modbus system.

The M2A provides an RS-485 serial communications interface. It is a Modbus Slave Device, supporting 2-wire
RS-485 Modbus RTU serial communications.

Wiring the M2A in a Modbus System

The M2A is a 2-wire Modbus RTU device. When wiring the M2A into a Modbus system, adhere to standard
Modbus wiring practices per the Modbus Over Serial Line Specification and Implementation Guide V1.0 or
later. This document can be found online at www.modbus.org/specs.php.

The Modbus protocol supports a maximum of 247 unique slave addresses (1-247). The M2A’s line driver
provides for up to 128 M2As to be connected together without the need for a repeater. Figure 34 & Figure 35
below illustrate typical M2A wiring configurations. If more than 128 M2As need to be connected together, RS-
485 repeater(s) should be used such that no more than 128 M2As reside on any given network segment.

CAUTION:

The network segment can only support 128 units if RKI M2As are being used. The use of any
other instruments will lower the number of units that may reside on any given network segment.

The MODBUS terminal strip is located on the terminal PCB (see Figure 9). The following signals are available
at the Modbus terminal strip:

Ground Jumper

The M2A includes a 2-pin ground header (see Figure 10) that is used when the M2A is used in a Modbus system.
Every M2A is supplied with a ground jumper (a jumper block) installed onto this header. If the M2A isn’t wired
into a Modbus system or if it is wired into one as shown in Figure 33, the ground jumper should be installed. If
the M2A is wired in a Modbus system as shown in Figure 32, the ground jumper should be removed.

Table 15: Modbus Terminal Strip Signals

Modbus Terminal Label

(RS-485 Name)

Modbus Signal Name

A

D0

B

D1

C

Common

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Summary of Contents for M2A

Page 1: ...M2A Transmitter Operator s Manual Part Number 71 0305RK Revision R Released 3 10 21 www com information itm com 1 800 561 8187 ...

Page 2: ...intenance of the gas monitor is essential for proper operation and correct readings Please calibrate and maintain this instrument regularly Frequency of calibration depends upon the type of use you have and the sensor types Typical calibration frequencies for most applications are between 3 and 6 months but can be required more often or less often based on your usage www com information itm com 1 ...

Page 3: ...air costs transportation costs or contingent expenses incurred without our prior approval THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTATIONS EXPRESSED OR IMPLIED AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS INC INCLUDING BUT NOT LIMITED TO THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE IN NO EVENT SHALL RKI INSTRUM...

Page 4: ...Chapter 3 Installation Startup 22 Overview 22 Mounting the M2A Transmitter 22 Wiring the M2A Transmitter 28 Start Up 35 Chapter 4 Operation 37 Overview 37 Normal Operation 37 Information Screen 37 4 20 mA Signal Output Operation 37 Alarm Indications 38 Chapter 5 Configuration Mode 42 Overview 42 Viewing Changing M2A Parameters 42 Chapter 6 Gas Type Mode 45 Overview 45 Selecting the Gas Type 45 www...

Page 5: ...Version 54 Replacing Components of the M2A 56 Chapter 8 RS 485 Modbus Output 61 Overview 61 Wiring the M2A in a Modbus System 61 Using the M2A in a 4 wire Modbus System 64 Modbus Mode 64 Supported Modbus Functions 66 Chapter 9 Parts List 71 Appendix A Control Button Quick Reference Guide 76 Appendix B PLC and DCS Device Wiring 77 Appendix C Function Code 16 Registers 79 www com information itm com...

Page 6: ...r front face and provides a 4 20 mA signal which indicates the target gas reading for use by a gas monitoring controller recording device or programmable controller The M2A also provides an RS 485 Modbus output Three sets of relay contacts two controlled by the gas alarms and one by the fail alarm rated at 115 VAC 5 amps are available for controlling devices such as lights or horns or for controll...

Page 7: ...drogen Sulfide H2S 0 100 ppm 1 ppm increments Hydrogen Sulfide H2S 0 50 ppm 0 1 ppm increments Toxic Ammonia NH3 0 75 0 ppm 0 1 ppm increments Ammonia NH3 0 100 ppm 1 ppm increments Ammonia NH3 0 200 ppm 1 ppm increments Ammonia NH3 0 500 ppm 1 ppm increments Arsine AsH3 0 1 50 ppm 0 01 ppm increments Chlorine Cl2 0 3 00 ppm 0 01 ppm increments Chlorine Cl2 0 5 00 ppm 0 01 ppm increments Chlorine ...

Page 8: ...00 ppm 2 00 ppm Construction housing Explosion proof Junction Box NEMA 4X Area Classification Explosion proof for Class I Groups B C and D Combustible CO2 CSA Type CO and H2S and CSA Type oxygen Sampling Method Diffusion Input Power 10 30 VDC Controls Three push button switches Three magnetic switches for non intrusive calibration Weight 4 5 lbs Signal Output 4 to 20 mA with impedance maximums lis...

Page 9: ...atalytic CH4 ppm range 5 of reading or 50 ppm whichever is greater IR Combustible Gas IR CO2 5 of reading or 2 of full scale whichever is greater Oxygen 0 5 O2 Hydrogen Sulfide 5 of reading or 2 ppm H2S whichever is greater Carbon Monoxide 5 of reading or 5 ppm CO whichever is greater Toxic Sensors ESM 01 Type and CT 7 Series Type 10 of reading or 5 of full scale whichever is greater These are RKI...

Page 10: ...nd sealed conduit plug to avoid leaks into the junction box If necessary the conduit plug can be removed and the top port can be used for wiring WARNING If the top conduit port is used for wiring be sure to seal the threads to ensure water does not enter the junction box See Wiring the M2A Transmitter on page 28 for complete wiring instructions Use the junction box s two mounting holes to mount th...

Page 11: ...T thread and require a 3 4 NPT x 1 2 NPT reducer to install in the detector port The table below outlines the M2A part numbers and replacement detector part numbers for the catalytic detectors Table 2 Catalytic Detectors Figure 2 Catalytic Sensors Target Gas Range M2A Part Number Detector Used Combustible Gas 0 100 LEL 65 2640RK 61 0140RK Catalytic UL version 65 2640RK 05 61 0140RK 05 Catalytic CS...

Page 12: ...d CH4 0 100 LEL 65 2649RK CH4 61 0190RK CH4 UL 65 2664RK CH4 61 0197RK CH4 CH4 0 5 00 volume 65 2649RK CH4 5 61 0190RK CH4 UL CH4 0 100 volume 65 2658RK CH4 61 0192RK CH4 UL 65 2665RK CH4 61 0199RK CH4 CO2 0 5 000 ppm 65 2660RK 02 61 0191RK 02 UL 65 2661RK 02 61 0198RK 02 CO2 0 9 000 ppm 65 2660RK 01 61 0191RK 01 UL 65 2661RK 01 61 0198RK 01 CO2 0 5 volume 65 2660RK 03 61 0191RK 03 UL 65 2661RK 03...

Page 13: ... be removed if replacement is required for the 65 2510RK The table below outlines the M2A part numbers and replacement detector part numbers for the oxygen detectors Table 4 Oxygen Detectors Target Gas Range M2A Part Number Detector Used Oxygen 0 25 65 2643RK 05 65 2514RK capillary CSA 65 2644RK 65 2510RK partial pressure 65 2666RK 65 2494RK capillary Detector Housing Body Cap Gasket Plug In IR LE...

Page 14: ...of H2S The 65 2495RK non explosion proof H2S detector includes an adhesive backed gasket inside the detector housing cap which helps ensure that the sensor remains plugged into the detector housing body The table below outlines the M2A part numbers and replacement detector part numbers for the CO and H2S detectors Table 5 CO and H2S Detectors Target Gas Range M2A Part Number Detector Used CO 0 300...

Page 15: ...Detector Part Number 65 2495RK Detector Part Numbers 65 2428 65 2428 01 Detector Housing Body XP Type Detector Housing Cap Charcoal Filter w Rubber Boot CO Plug in Sensor Cap Gasket Detector Housing Body Cap Gasket Hydrophobic Membrane CO Plug in Sensor Flame Arrestor Guard Detector Housing Cap Non XP Type Detector Part Number 65 2496RK Detector Housing Body Rubber Boot w Charcoal Filter XP Type D...

Page 16: ... apply gas to an ESM 01 detector remove the splashguard to allow access to the sensor that protrudes through the detector housing cap You can then push the appropriate ESM 01 calibration cup onto the sensor The table below outlines the M2A part numbers and replacement detector part numbers for the ESM 01 detectors Table 6 ESM 01 Detectors Figure 7 ESM 01 Type Detector Target Gas Range M2A Part Num...

Page 17: ...get Gas Range M2A Part Number Detector Used Cl2 0 3 ppm 65 2670 CL2 3 65 2302 CL2 3 Cl2 0 5 ppm 65 2670 CL2 5 65 2302 CL2 5 Cl2 0 10 ppm 65 2670 CL2 10 65 2302 CL2 10 ClO2 0 1 ppm 65 2670 CLO2 1 65 2302 CLO2 1 ClO2 0 3 ppm 65 2670 CLO2 3 65 2302 CLO2 3 ClO2 0 5 ppm 65 2670 CLO2 5 65 2302 CLO2 5 HCN 0 15 0 ppm 65 2670 HCN 15 65 2302 HCN 15 NH3 0 75 0 ppm 65 2670 NH3 75 65 2302 NH3 75 NH3 0 100 ppm ...

Page 18: ...4 20 mA signal may be used by a recording device gas monitor controller or programmable controller The Modbus output may be used to connect the M2A to a Modbus network The terminal PCB also controls three relays one fail and two gas alarm Two columns of plug in style terminal strips are used to make all wiring connections to the M2A The column on the left consists of the power signal detector and ...

Page 19: ...ible or CO2 M2A all four terminals are used to connect the detector to the M2A For a toxic or oxygen M2A only two of the terminals are used for connecting a detector two terminals are dedicated for connecting a toxic detector and two are dedicated for connecting an oxygen detector only one detector can be installed Figure 11 Detector Terminal Strip S A B C RS 485 PWR SIG R W G B LEL C NC NO ALARM ...

Page 20: ...ed is located below the Modbus terminal strip Leave this jumper installed unless directed to remove it for a Modbus installation See Chapter 8 RS 485 Modbus Output on page 61 for a description of using the M2A in a Modbus system Ground Jumper A two pin header with a jumper installed is located along the left side of the terminal PCB Leave this jumper installed unless directed to remove it for a Mo...

Page 21: ... displaying the Information Screen only requires the use of one switch the wand may be used to show the Information Screen see Information Screen on page 37 Status LEDs The M2A includes five status LEDs that are located above the display see Figure 12 Fail LED The fail LED turns on when the M2A is experiencing a fail condition A fail condition can be caused by a detector failure or low detector si...

Page 22: ...cedures Select a site where the target gas is likely to be found first For lighter gases mount the detector near the ceiling for heavier gases mount the detector near the floor 2 At the monitoring site use 10 screws through the junction box s two mounting holes to secure the junction box to a vertical surface Figure 13 Figure 20 show the outline and mounting dimensions for each version of the M2A ...

Page 23: ...gure 15 Outline Mounting Dimensions IR Combustible CO2 47 2X 30 2X 3 4 NPT Conduit Port Plugged 2 41 5 00 2 3 max 1 02 3 4 NPT Conduit Port 4 59 5 23 5 86 7 7 max 1 9 max 3 4 NPT Conduit Port Plugged 7 4 max 1 02 5 86 4 59 5 23 30 2X 47 2X 2 41 5 00 3 4 NPT Conduit Port www com information itm com 1 800 561 8187 ...

Page 24: ...sor H2S CO and Oxygen Non Explosion Proof 3 4 NPT Conduit Port Plugged 7 9 max 2 6 max 5 23 47 2X 2 41 5 00 30 2X 3 4 NPT Conduit Port 1 1 2 20 For Calibration Cup 1 02 5 86 4 59 3 4 NPT Conduit Port Plugged 1 5 max 1 1 2 20 For Calibration Cup 3 4 NPT Conduit Port 6 9 max 5 23 47 2X 30 2X 2 41 5 00 5 86 1 02 4 59 www com information itm com 1 800 561 8187 ...

Page 25: ...al 25 Figure 18 Outline Mounting Dimensions H2S CO and Oxygen CSA Explosion Proof 3 4 NPT Conduit Port Plugged 3 4 NPT Conduit Port 8 6 max 3 4 max 5 23 47 2X 2 41 5 00 30 2X 5 86 1 02 4 59 www com information itm com 1 800 561 8187 ...

Page 26: ...Operator s Manual Figure 19 Outline Mounting Dimensions ESM 01 Toxic 3 4 NPT Conduit Port Plugged 4 82 max 10 4 max 5 86 1 02 4 59 5 00 5 23 47 2X 30 2X 2 41 3 4 NPT Conduit Port www com information itm com 1 800 561 8187 ...

Page 27: ...nual 27 Figure 20 Outline Mounting Dimensions CT 7 Series 3 4 NPT Conduit Opening Plugged 1 40 max 1 02 4 59 CT 7 Detector 5 00 2 41 5 23 47 2X 30 2X 5 86 6 80 max 3 4 NPT Conduit Opening www com information itm com 1 800 561 8187 ...

Page 28: ...rom the cable and set aside while wiring 5 The detector leads are factory wired Verify that the detector leads are wired to the detector terminal strip as shown in the applicable figure below Catalytic LEL Catalytic ppm IR Combustible IR CO2 Detectors The wiring for these types of detectors is the same Red wire to terminal labeled LEL R white wire to terminal labeled LEL W green wire to terminal l...

Page 29: ...e Oxygen Detector Wiring Figure 24 CSA Capillary Type Oxygen Detector Wiring Figure 25 Capillary Type Replaceable Sensor Oxygen Detector Wiring Green White C NC NO ALARM 1 C NC NO ALARM 2 C NC NO FAIL S PWR SIG TOXIC OXY RS 485 A B C Green White C NC NO ALARM 1 C NC NO ALARM 2 C NC NO F AIL S PW R SIG TOXIC OXY RS 485 A B C Green White C NC NO ALARM 1 C NC NO ALARM 2 C NC NO FAIL S PWR SIG TOXIC O...

Page 30: ...g CSA Non Explosion Proof CO or H2S Gas Detectors Red wire to terminal labeled TOXIC black wire to terminal labeled TOXIC Figure 27 H2S CO Detector Wiring Black Red C NC NO ALARM 1 C NC NO ALARM 2 C NC NO FAIL S PWR SIG T OXIC OXY RS 485 A B C Black S PWR SIG TOXIC OXY RS 485 A B C C NC NO ALARM 1 C NC NO ALARM 2 C NC NO FAIL Red www com information itm com 1 800 561 8187 ...

Page 31: ...d wire see chart below to the terminal labeled TOXIC and the black wire to the terminal labeled TOXIC Figure 28 ESM 01 Toxic Detector Wiring Black Brown AsH3 Yellow Cl2 See Chart White HCN Green PH3 Blue SO2 Red NH3 C NC NO ALARM 1 C NC NO ALARM 2 C NC NO FAIL S PWR SIG TOXIC OXY RS 485 A B C Gas Type Wire Color www com information itm com 1 800 561 8187 ...

Page 32: ...tector terminal strip and the alarm 1 relay terminal strip may be removed by grasping them with your fingers if the adjacent terminal strips have been removed WARNING If the M2A is installed in a hazardous location use appropriately rated conduit conduit fittings and appropriate construction technique that complies with the local electrical code In addition use appropriately rated conduit conduit ...

Page 33: ...to seal the threads to ensure water does not enter the junction box A conduit seal which is normally required to maintain the junction box s hazardous location rating will also help to prevent water from entering through the top port NOTE If the M2A is being wired to a PLC or DCS device see Appendix B PLC and DCS Device Wiring on page 77 then continue with step 8 Location Detector Conduit Seal Wit...

Page 34: ...connections leave the cable shield s drain wire insulated and disconnected at the M2A You will connect the opposite end of the cable s drain wire at the controller or device If the M2A will be wired into a Modbus network see Chapter 8 RS 485 Modbus Output on page 61 See Figure 30 below for field wiring connections to the M2A Figure 30 Wiring the M2A to a Controller and Alarm Devices 9 Re install t...

Page 35: ...s CO2 and Toxic Versions on page 50 or Calibration Oxygen Version on page 54 Verify that the M2A is in a fresh air environment environment known to be free of the target gas and combustible or toxic gas vapors and of normal oxygen content 20 9 CAUTION If you suspect the presence of combustible gas CO2 toxic gas or that the oxygen content is not normal in the monitoring environment use the calibrat...

Page 36: ...ate the target gas and CAL Mode for a few seconds before showing FreshAir Adjust 3 Press and release the UP YES button ENTER will alternate with FreshAir on the top display line and the current gas reading will be on the bottom display line 4 Press and release the ENTER button The M2A will perform a zero operation and the display will indicate SPAN w Cal Gas 5 Press and release the DOWN NO button ...

Page 37: ... 2 Continue holding the DOWN NO button to keep the Information Screen on the display The top line indicates the operating voltage that is connected to the M2A The second line indicates the firmware that is running version 6 0 in this example and the M2A s hardware version version 2A in this example This information may be useful if you need to contact the factory with questions about the M2A 3 Rel...

Page 38: ...e signal output continue to track the reading down to 99 of full scale 1 15 mA Alarm Indications NOTE The M2A includes alarm on and alarm off delay settings for alarm 1 and alarm 2 The alarm indications described in this section operate according to the factory set alarm settings See Table 11 on page 43 for all the factory settings Table 10 Visual and Audible Alarm Indications Condition Cause Visu...

Page 39: ...e energizes the alarm 1 relay NOTE If the ENTER button is pressed while the M2A is in an alarm 1 condition the A1 LED will flash but all other indications will remain unchanged You cannot de energize the alarm 1 relay until the gas reading falls below above for oxygen the alarm 1 setpoint Alarm 2 Condition Alarm 2 Condition Indications When the gas reading reaches the alarm 2 setpoint the M2A sens...

Page 40: ...he FAIL message The fail relay de energizes NOTE The fail alarm has a 30 second delay Responding to a Fail Condition 1 Verify that the detector wiring is correctly and securely connected 2 If the M2A has a replaceable plug in sensor verify that the replaceable plug in sensor in the detector housing is properly installed Low Power Alarm Low Power Alarm Indications The M2A senses a low power conditi...

Page 41: ...low power condition 2 When the input power increases above 10 0 volts the M2A will begin its warm up sequence 3 Verify that the M2A enters normal operation after its warm up sequence If necessary perform a fresh air adjustment See Adjusting the Fresh Air Reading on page 35 www com information itm com 1 800 561 8187 ...

Page 42: ...l operation simultaneously press and hold the UP YES and ENTER buttons for 5 seconds to enter Configuration Mode Release the buttons when the following screen appears 2 If you want to exit Configuration Mode press and release the DOWN NO button and the M2A will return to normal operation If you want to continue in Configuration Mode press and release the UP YES button The target gas and the full s...

Page 43: ...LF RST It can be set in 1 second increments from 0 60 seconds in 1 minute increments from 1 15 minutes and in 15 minute increments from 15 60 minutes ALARM 2 level See Table 1 on page 7 The gas reading at which the M2A initiates an alarm 2 condition ALARM 2 activation Increase for all types Indicates if the alarm 2 circuit is activated by gas readings increasing Increase or decreasing Decrease to ...

Page 44: ... near the fresh air reading For example if the zero suppression setting for a combustible LEL detector is 2 0 LEL the M2A will display a reading of 0 LEL for gas readings from 2 LEL to 2 LEL It is settable from 0 to 6 of the detection range FILTER 5 secs The filter feature helps smooth out jumpy or noisy signals from the detector You can set the filter from 0 seconds to 60 seconds in 5 seconds inc...

Page 45: ...on or during the warm up sequence press and hold the UP YES and DOWN NO buttons for five seconds Release them when the following screen appears 2 If you want to exit Gas Type Mode press and release the DOWN NO button The display will indicate NO CHANGE and the M2A will return to normal operation If you want to continue in Gas Type Mode press and release the UP YES button The top display line will ...

Page 46: ... Oxygen Gas Types Gas Type Choices Detection Range H2S 0 100 ppm CO 0 300 ppm CO 0 200 ppm CO 0 100 ppm CL2 0 3 00 ppm CL2 0 10 0 ppm NH3 0 75 0 ppm SO2 0 6 00 ppm ASH3 0 1 50 ppm H2S 0 50 0 ppm CLO2 0 1 00 ppm CLO2 0 3 00 ppm NH3 0 500 ppm NH3 0 200 ppm HCN 0 15 0 ppm CLO2 0 5 00 ppm CL2 0 5 00 ppm NH3 0 100 ppm PH3 0 1 00 ppm SIH4 0 15 0 ppm Table 12 Combustible Gas CO2 Gas Types Gas Type Choice...

Page 47: ...ease the UP YES button The display will indicate Config Saved and the M2A will begin its warm up sequence To discard the settings and review them again press the DOWN NO button The display will ask DO OVER YES NO Press the UP YES button and the display will indicate Re do Config then display the target gas and the detection range for a few seconds before returning to Configuration Mode Repeat step...

Page 48: ...n Calibration Combustible Gas CO2 and Toxic Versions on page 50 See Calibration Frequency on page 50 for a discussion of calibration frequency guidelines Troubleshooting The troubleshooting guide describes symptoms probable causes and recommended action for problems you may encounter with the M2A NOTE This troubleshooting guide describes M2A problems only If the M2A is connected to a controller se...

Page 49: ...ect and secure 3 Calibrate the M2A 4 If the fail condition continues replace the detector 5 If the fail condition continues contact RKI for further instruction Slow or No Response Difficult or Unable to Calibrate Unable to successfully set the fresh air or span zero for oxygen reading during calibration M2A requires frequent calibration Note See Calibration Frequency on page 50 for calibration fre...

Page 50: ...ion than every 3 months for a non IR M2A or every 6 months for an IR M2A may be necessary For combustible gas detection with an M2A that uses a catalytic detector if potential catalyst poisons are known or likely to be present more frequent calibration than every 3 months will be necessary Calibration Combustible Gas CO2 and Toxic Versions This section describes how to calibrate the combustible ga...

Page 51: ...tment the M2A will freeze the display reading at the highest response to the calibration gas The calibration gas can then be removed and the M2A will continue to display this reading and retain it in its memory until the span adjustment procedure is completed Preparing for Calibration NOTE The following procedure assumes the use of a calibration kit which includes a calibration gas cylinder a zero...

Page 52: ...FreshAir on the top display line and the current gas reading will be on the bottom display line To skip adjusting the fresh air reading press and release the DOWN NO button The display will indicate SPAN w Cal Gas Skip to the next section Adjusting the Span Setting 4 Screw the zero air cylinder into the fixed flow regulator 5 Turn the regulator knob counterclockwise to open the regulator 6 Allow z...

Page 53: ...n the response level in its memory 7 Adjust the gas reading up or down to match the calibration gas cylinder concentration by using the UP YES and DOWN NO buttons then press and release the ENTER button NOTE The detector must be calibrated with a gas concentration between 10 and 100 of the channel s full scale value ie a 0 300 ppm CO detector must be calibrated with a CO concentration between 30 a...

Page 54: ...ons to set the calibration time out NOTE The following procedure assumes that the oxygen concentration in the calibration area is not normal 20 9 but is oxygen deficient If a fresh air environment can be verified applying zero air to the detector is not necessary when adjusting the fresh air span setting 1 Connect the calibration kit sample tubing to the calibration cup hose barb 2 Screw the calib...

Page 55: ...cylinder into the fixed flow regulator 5 Turn the regulator knob counterclockwise to open the regulator 6 Allow zero air to flow for 2 minutes If the oxygen concentration in the area is less than 20 9 the reading should stabilize after 2 minutes 7 Turn the regulator knob clockwise to close the regulator 8 Unscrew the zero air cylinder from the fixed flow regulator leaving the calibration cup on th...

Page 56: ...A versions that do not have a replaceable plug in sensor or if you determine that it is necessary to replace the entire detector use the procedure in this section to change the entire detector For M2A versions that include a replaceable plug in sensor see the appropriate instructions in the sections that follow this one to replace the plug in sensor 1 Turn off or disconnect power to the M2A 2 Remo...

Page 57: ...w the replacement detector to warm up for 15 minutes before you continue with the next step 15 Calibrate the replacement detector as described in Calibration Combustible Gas CO2 and Toxic Versions on page 50 or Calibration Oxygen Version on page 54 Replacing the CO H2S or CT 7 Series Plug in Sensor NOTE This procedure is applicable for the CSA type explosion proof CO and H2S detectors the non expl...

Page 58: ...hydrocarbons If you are experiencing unexplained upscale readings on a CO M2A the charcoal filter may be saturated and no longer scrubbing out interfering gases and it may be necessary to change the charcoal filter 1 Turn off or disconnect power to the M2A 2 Unscrew the detector housing cap from the housing body Make sure not to lose the cap gasket See Figure 6 for an illustration of the CO detect...

Page 59: ... If the splash guard was unscrewed from the detector cap screw it back onto the detector cap 7 Turn on or reconnect power to the M2A NOTE Allow the replacement sensor to warm up for 15 minutes before you continue with the next step 8 Calibrate the detector as described in Calibration Combustible Gas CO2 and Toxic Versions on page 50 Replacing the Hydrophobic Membrane Non XP CO H2S and O2 Detectors...

Page 60: ...adhesive backed membrane 6 Install the new membrane on the face of the plug in sensor 7 Plug the sensor back into the four socket pattern in the detector housing body 8 Make sure the cap gasket is in place and screw the detector housing cap back onto the detector housing body 9 Turn on or reconnect power to the M2A www com information itm com 1 800 561 8187 ...

Page 61: ...te typical M2A wiring configurations If more than 128 M2As need to be connected together RS 485 repeater s should be used such that no more than 128 M2As reside on any given network segment CAUTION The network segment can only support 128 units if RKI M2As are being used The use of any other instruments will lower the number of units that may reside on any given network segment The MODBUS terminal...

Page 62: ...tem that is being replaced is already installed and it is not practical to run another wire See Figure 33 below for this wiring configuration In this configuration the wire between the C terminal on the M2A and the Common terminal on the Modbus controller is omitted Instead the Common terminal on the Modbus controller is connected to the of the 24 VDC power supply The ground jumper must be install...

Page 63: ... Modbus line Any M2A in a Modbus system that is not at the end of a line must have the termination jumper removed see Figure 34 Figure 35 below Figure 34 Multiple M2As in a Daisy Chain Configuration Figure 35 Multiple M2As in a Two Branch Configuration Modbus Master Up to 128 M2As can be connected without a repeater RS 485 RS 485 ID 126 ID 127 M2A Termination Jumper Not Installed M2A Termination J...

Page 64: ...ration NOTE If the M2A returns to normal operation because of a time out it enters a warm up period just as it does when it is first turned on 1 While in normal operation simultaneously press and hold the DOWN NO and ENTER buttons for 5 seconds to enter Modbus Mode Release the buttons when the following screen appears 2 To exit Modbus Mode press and release the DOWN NO button The M2A will return t...

Page 65: ...n a Modbus network must be configured with the same baud rate and parity and each M2A must have a unique slave ID For an M2A to participate on a network the ENABLED DISABLED setting must be set to ENABLE Table 16 Modbus Configuration Parameters Modbus Mode Parameter Available Settings Description Enabled Disabled Can be set to ENABLED or DISABLED factory setting Enables or disables the Modbus outp...

Page 66: ...Bit s Value Field 15 Sign of Reading 0 Positive 1 Negative 14 13 Format of Reading 0 XXX no decimal point 1 XX X 2 X XX 3 XXX 12 0 Numerical value of display reading 8000 max Table 18 Register 2 Operating State Alarms Relays Bit Field Assignments Bit s Value 15 12 Operating State 0 Undefined 1 Initialization 2 Normal 3 Warm up 4 Fail 5 Calibration 6 Post Calibration 7 Low Power 8 Setup 11 Gas Type...

Page 67: ... is the same as specified in Register 1 Registers 15 19 Registers 15 19 are the Gas Name ASCII String NULL Terminated Registers 20 22 Registers 20 22 are the Gas Units String NULL Terminated 7 6 Alarm 2 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unused Code 5 4 Alarm 1 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unused Code 3 Overscale Status 0 Not Overscal...

Page 68: ...s are in seconds Register 28 Register 28 is the alarm 2 trigger 0 Decreasing 1 Increasing Register 29 Register 29 is the alarm 2 normal relay state 0 Normally De Energized 1 Normally Energized Register 30 Register 30 is the alarm 2 relay reset 0 Latching 1 Self Resetting Register 31 Register 31 is the alarm 2 ON delay Integer values are in seconds Register 32 Register 32 is the alarm 2 OFF delay I...

Page 69: ...utcome Upper Gas Operation Lower Air Operation Calibration Outcome Codes 1 Sensor Missing 2 Sensor Too Weak 3 Signal Too Strong 4 Not Enough Span 5 Negative Reading 6 Span Gas Value Is Not OK 7 Calculated Zero Is Too Low 8 Calculated Zero Is Too High 9 Zero Failure 10 Span Failure 11 Calibration Is Overscale 12 LEL Sensor Offset Is Too High 13 LEL Null Operation Failed 14 Operation Not Performed R...

Page 70: ... C Function Code 16 Registers on page 79 Register 16 Register 16 performs the same function as the ENTER button on the M2A It is useful for remotely silencing alarms With the M2A in an alarm condition bit 0 can be used to silence it NOTE Register 40 in Function Code 03 the remote configuration register must be set to 1 in order for Register 16 to work Table 19 Register 16 Button Function Bit Value...

Page 71: ...0RK 05 LEL detector catalytic type CSA version 61 0140RKA CH4 ppm detector catalytic type UL version 61 0140RKA 05 CH4 ppm detector catalytic type CSA version 61 0190RK CH4 CH4 0 100 LEL 0 5 00 volume detector IR type non replaceable sensor 61 0190RK HC HC LEL detector IR type non replaceable sensor propane calibration 61 0191RK 01 CO2 detector IR type non replaceable sensor 0 9 000 ppm 61 0191RK ...

Page 72: ... ppm and 0 10 0 ppm Cl2 with membrane for 65 2302 CL2 65 2302 CL2 5 and 65 2302 CL2 10 detectors 65 2052 01 CT 7 Series plug in sensor 0 1 00 ppm ClO2 0 3 00 ppm ClO2 and 0 5 00 ppm ClO2 with mem brane for 65 2302 CLO2 65 2302 CLO2 3 and 65 2302 CLO2 5 detectors 65 2053 01 CT 7 Series plug in sensor 0 500 ppm NH3 with membrane for 65 2302 NH3 5 detector 65 2054 01 CT 7 Series plug in sensor 0 75 0...

Page 73: ...losion proof replaceable sensor type includes plug in sensor 65 2495RK H2S detector assembly 0 100 ppm non explosion proof replaceable sensor type includes plug in sensor 65 2496RK CO detector assembly 0 300 ppm non explosion proof replaceable sensor type includes plug in sensor 65 2510RK Oxygen detector partial pressure type 65 2511RK Oxygen detector capillary type 65 2514RK Oxygen detector CSA v...

Page 74: ...setting oxygen zero 81 0078RK 03 Calibration cylinder 100 nitrogen 103 liter used for setting oxygen zero 81 0151RK 02 Calibration cylinder H2S 25 ppm in nitrogen 58 liter 81 0151RK 04 Calibration cylinder H2S 25 ppm in nitrogen 34 liter aluminum 81 0170RK 02 Calibration cylinder 5 ppm SO2 in nitrogen 58 liter 81 0170RK 04 Calibration cylinder 5 ppm SO2 in nitrogen 34 liter aluminum 81 0176RK 02 C...

Page 75: ...ration cup for ESM 01 NH3 use 0 25 LPM flow 81 1190RK Splashguard for ESM 01 detector cap 81 9029RK 02 Calibration cylinder 100 ppm NH3 in nitrogen 58 liter ES 1531 CO CO sensor plug in for 65 2438 65 2438 01 and 65 2496RK detectors ES 1537 H2S H2S sensor plug in for 65 2428 65 2428 02 and 65 2495RK detectors ESM 015 NO ESM 01 plug in sensor 0 100 ppm nitric oxide ESM 01DH ASH3 ESM 01 plug in sens...

Page 76: ... Mode Entered or Function Performed Button Combination Adjustable or Viewable Parameters Alarm Reset Press and Release ENTER n a Show Information Screen Press and Hold DOWN NO Input Voltage M2A Version Revision Information Calibration Mode Press and Hold UP YES for 5 seconds Fresh Air Adjust Span or Zero for Oxygen Adjust with Calibration Gas Configuration Mode Press and Hold UP YES ENTER for 5 se...

Page 77: ...nnections and one or more relays are used route the connections to the M2A in conduit Use shielded cable in the conduit for the PWR SIG connections and unshielded cable or individual wires for the relay connections Make sure any wire or cable used for relay wiring is appropriately rated for the power that it will carry NOTE If shielded cable is used for the PWR SIG connections leave the cable shie...

Page 78: ...m 1 Alarm Device Fail Alarm Device Alarm Device Power Typical Alarm Wiring Shown 4 20 mA In S 24 VDC 24 VDC 24 VDC Power Supply 24 VDC Alarm 2 Alarm Device See Modbus Wiring S A B C R S 485 PWR SIG R W G B L EL See Detector Wiring Controller PLC DCS C NC NO ALARM 1 C NC NO ALARM 2 C NC NO F AIL www com information itm com 1 800 561 8187 ...

Page 79: ...ster 4 is the alarm 1 relay reset 0 Latching 1 Self Resetting Register 5 Register 5 is the alarm 1 ON delay Integer value is in seconds Register 6 Register 6 is the alarm 1 OFF delay Integer value is in seconds Register 7 Register 7 is the alarm 2 set point Value must be an integer Any decimals are omitted The decimal point location is the same as specified in Register 1 of Function Code 03 Regist...

Page 80: ...25 or 30 Register 16 Register 16 is explained in Supported Modbus Functions in the M2A manual Register 17 Register 17 is the calibration month MSB and day LSB This is zero based e g January 0 and the 1st 0 Register 18 Register 18 is the calibration year Register 19 Register 19 is for clearing change flags When parameters are changed at the M2A a flag is raised at the controller This register can b...

Page 81: ...M2A Transmitter Operator s Manual 81 Register 21 Register 21 is the Remote Configuration Register 0 No Remote Configuration 1 Reset Alarm www com information itm com 1 800 561 8187 ...

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