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RKI Instruments M2A Operator's Manual

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M2A Transmitter
Operator's Manual
Part Number: 71-0305RK
Revision: R
Released: 3/10/21
1.800.561.8187
information@itm.com
www.
.com

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  • Page 1 M2A Transmitter Operator’s Manual Part Number: 71-0305RK Revision: R Released: 3/10/21 1.800.561.8187 information@itm.com www. .com...
  • Page 2 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. M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www.
  • Page 3 RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge. This warranty does not apply to those items which by their nature are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced on a routine basis.

  • Page 4: Table Of Contents

    Mounting the M2A Transmitter ........22...
  • Page 5 Calibration, Oxygen Version ........54 Replacing Components of the M2A ....... . 56 Chapter 8: RS-485 Modbus Output .

  • Page 6: Chapter 1: Introduction

    The M2A displays the current gas reading on an OLED display which is visible through the window in the cover (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.

  • Page 7: Specifications

    Specifications Table 1 lists specifications for the M2A. Table 1: M2A Specifications Target Gas/ Combustible Gas/Carbon Dioxide (CO Detection Range • Catalytic LEL: 0 - 100% LEL, 1% LEL increments (CH calibration unless otherwise specified. H specific detector available) •...
  • Page 8 Table 1: M2A Specifications Alarm Settings Carbon Monoxide (all ranges): 25 ppm / 50 ppm (Alarm 1/Alarm 2)*, Chlorine (0 - 3.00 ppm): 0.50 ppm / 1.00 ppm cont’d Chlorine (0 - 5.00 ppm): 0.50 ppm / 1.50 ppm Chlorine (0 - 10.0 ppm): 1.0 ppm / 3.0 ppm Chlorine Dioxide (0 - 1.00 ppm): 0.10 ppm / 0.30 ppm...
  • Page 9 Toxic Sensors (ESM-01 Type and CT-7 Series Type): ± 10% of reading or ± 5% of full scale (whichever is greater) These are RKI factory settings. See “Viewing & Changing M2A Parameters” on page 42 to change the alarm settings. Independent of zero drift.

  • Page 10: Chapter 2: Description

    Use the junction box’s two mounting holes to mount the M2A to a vertical surface at the monitoring site. The window in the cover on the front of the junction box allows you to view the OLED display and use the magnetic wand to actuate the magnetic control switches so you can perform non-intrusive calibration.
  • Page 11 The gas detector senses the target gas and is mounted in a 3/4 NPT conduit port on the right bottom side of the M2A. A variety of detectors may be used with the M2A. See the sections below for descriptions of each type of detector.
  • Page 12 The table below outlines the M2A part numbers and replacement detector part numbers for the infrared (IR) detectors. Table 3: Infrared (IR) Detectors...
  • Page 13 (65-2494RK) has a replaceable plug-in sensor inside the detector housing. The entire oxygen detector must 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...
  • Page 14 S 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 H detectors.
  • Page 15 Rubber Boot w/ Charcoal Filter Charcoal Filter w/Rubber Boot Detector Detector Housing Cap Housing Cap Flame Arrestor Hydrophobic Guard Membrane Detector Part Number Detector Part Number 65-2438 65-2496RK 65-2438-01 Figure 6: CO Detectors M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 16 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.
  • Page 17 The table below outlines the M2A part numbers and replacement detector part numbers for the CT-7 Series detectors. Table 7: CT-7 Series Detectors...

  • Page 18: Internal Description

    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 Modbus terminal strips.
  • Page 19 The power/signal terminal strip is a three position plug-in style terminal strip located at the top of the left terminal column. It is used to connect 24 VDC power to the M2A and to connect the 4 - 20 mA output signal to a device.
  • Page 20 NOTE: The detector is factory-wired to the M2A. See “Wiring the M2A Transmitter” on page 28 for all wiring procedures related to M2A. Modbus Terminal Strip The Modbus terminal strip is a three position plug-in style terminal strip and is the bottom terminal strip in the left terminal column.
  • Page 21 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 signal. •...

  • Page 22: Chapter 3: Installation & Startup

    Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site. • Select a site where the M2A is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures. •...
  • Page 23 5.00 3/4 NPT Conduit Port, 2.41 Plugged 3/4 NPT Conduit Port 5.86 5.23 7.4 max 1.9 max .47 (2X) .30 (2X) 1.02 Figure 15: Outline & Mounting Dimensions, IR Combustible & CO M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 24 5.86 5.23 6.9 max 1 1/2-20 For 1.5 max Calibration Cup .47 (2X) 1.02 .30 (2X) Figure 17: Outline & Mounting Dimensions, Replaceable Sensor, H S, CO, and Oxygen, Non Explosion Proof M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 25 Conduit Port, 2.41 Plugged 3/4 NPT Conduit Port 5.86 5.23 8.6 max 3.4 max .47 (2X) .30 (2X) 1.02 Figure 18: Outline & Mounting Dimensions, H S, CO, and Oxygen, CSA, Explosion-Proof M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 26 4.59 5.00 3/4 NPT Conduit Port, 2.41 Plugged 3/4 NPT Conduit Port 5.86 5.23 10.4 max .47 (2X) 4.82 max .30 (2X) 1.02 Figure 19: Outline & Mounting Dimensions, ESM-01 Toxic M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 27 3/4" NPT 5.00 Conduit Opening 2.41 Plugged 5.86 5.23 6.80 max 1.40 max 3/4" NPT Conduit Opening .47 (2X) 1.02 .30 (2X) CT-7 Detector Figure 20: Outline & Mounting Dimensions, CT-7 Series M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...

  • Page 28: Wiring The M2A Transmitter

    Wiring the M2A Transmitter WARNING: Always verify that the power source is OFF before making any wiring connections. Remove the junction box cover. Grasp the control PCB by its edges. Gently pull until the control PCB is pulled away from the banana jacks. Take care not to pull too hard and damage the cable which connects the control and terminal PCBs.
  • Page 29 OXY -. Green White Figure 23: Partial Pressure Oxygen Detector Wiring Green White Figure 24: CSA Capillary Type Oxygen Detector Wiring Green White Figure 25: Capillary Type Replaceable Sensor Oxygen Detector Wiring M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 30 S/CO Detector Wiring, CSA Non Explosion Proof CO or H S Gas Detectors Red wire to terminal labeled TOXIC +, black wire to terminal labeled TOXIC -. Black Figure 27: H S/CO Detector Wiring M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 31 (see chart below) to the terminal labeled TOXIC + and the black wire to the terminal labeled TOXIC -. Black See Chart Wire Color Gas Type Brown AsH3 Yellow White Green Blue Figure 28: ESM-01 Toxic Detector Wiring M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 32 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.
  • Page 33 Guide multi conductor shielded cable or cables or wires in conduit through the conduit port on the left side of the junction box. The number of cables or wires needed will depend on whether the M2A is wired to a gas monitoring controller or just to power, whether any relays are used, and whether the Modbus output is used.
  • Page 34 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. Alarm Device...

  • Page 35: Start Up

    Adjusting the Fresh Air Reading When the M2A is shipped from RKI Instruments, Inc., it is factory calibrated. If a full calibration is desired at startup, see “Calibration, Combustible Gas, CO2, and Toxic Versions” on page 50 or “Calibration, Oxygen Version”...
  • Page 36 The 4-20 mA output signal will “freeze” at 3.5 mA for a toxic, combustible gas, or CO M2A, or at 17.4 mA for an oxygen M2A, and all relays will remain in their non-alarm state while the M2A is in Calibration Mode. The output signal will not indicate current readings and the relays will not resume operating normally until the M2A is in normal operation again.

  • Page 37: Chapter 4: Operation

    Chapter 4: Operation Overview This chapter describes the M2A in normal operation. This chapter also describes the M2A in alarm 1, alarm 2, and fail conditions and suggests responses to these conditions. Normal Operation Normal operation is defined as follows: •...

  • Page 38: Alarm Indications

    LowPower message and actual voltage of incoming DC power If the M2A is in both an alarm 1 and an alarm 2 condition, both alarm LEDs are on and the display alternates between the gas reading and the ALMS 1&2 message.
  • Page 39 The alarm 2 relay energizes. NOTE: If the M2A is in both an alarm 1 and alarm 2 condition, both the A1 and A2 LEDs will be on, the gas reading will alternate with the ALMS 1&2 message, and both alarm relays will energize.
  • Page 40 NOTE: If the ENTER button is pressed while the M2A is in an alarm 2 condition, the A2 LED will flash but all other indications will remain unchanged. You cannot de-energize the alarm 2 relay until the gas reading falls below the alarm 2 setpoint.
  • Page 41 When the input power increases above 10.0 volts, the M2A will begin its warm-up sequence. 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.

  • Page 42: Chapter 5: Configuration Mode

    If you are installing a new M2A, it has been setup at the factory. Use Configuration Mode only if you want to change the M2A’s setup. If you want to change the detector type see “Chapter 6: Gas Type Mode”...
  • Page 43 15 - 60 minutes. A1 OffDy (alarm 1 off delay) The amount of time the M2A delays turning off the alarm 1 circuit once an alarm (0 sec.) 1 condition passes. This parameter appears only if the alarm 1 relay reset setting is set to SELF-RST.
  • Page 44 OVER? YES/NO message will display. Press and release the UP/YES button. The Re-do Config message will display and the M2A will return to the first adjustable parameter. Go back to step 3 and continue. If you wish to save the adjustments made, press and release the UP/YES button. Config Saved is indicated on the display for a few seconds and the M2A returns to normal operation.

  • Page 45: Chapter 6: Gas Type Mode

    Chapter 6: Gas Type Mode Overview This chapter describes how to use Gas Type Mode to select the M2A’s gas type. The gas type determines the target gas and detection range. The combustible gas/CO and toxic/oxygen M2As have a different terminal PCB and run on different firmware.
  • Page 46 0 - 500 ppm 0 - 200 ppm 0 - 15.0 ppm CLO2 0 - 5.00 ppm 0 - 5.00 ppm 0 - 100 ppm 0 - 1.00 ppm SIH4 0 - 15.0 ppm M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 47 To save the gas type, press and release the UP/YES button. The display will indicate Gas Type Updated, the display will indicate the target gas and the detection range for a few seconds, and then the M2A will enter Configuration Mode automatically so that the parameter settings in Configuration Mode can be verified or changed.

  • Page 48: Chapter 7: Maintenance

    M2A. It includes daily, quarterly, and biannual procedures. Daily Verify a display reading of zero (20.9% for an oxygen M2A). Investigate significant changes in the reading. Quarterly Calibrate M2As that do not have an IR detector as described in “Calibration, Combustible Gas, CO2, and Toxic Versions”...
  • Page 49 The detector wiring to the 1. Verify that the detector wiring is correct and secure. condition. terminal PCB is disconnected 2. Verify that the wiring between the M2A and the or misconnected. controller is correct and secure. • Controller indicates a fail condition •...

  • Page 50: Calibration Frequency

    If an application is not very demanding, for example detection in a clean, temperature controlled environment where the toxic or combustible target gas is not normally present, and calibration adjustments are minimal at calibration, then a calibration frequency of every 6 months for a non-IR M2A or 12 months for an IR M2A is adequate.
  • Page 51 This feature enables one person to perform a calibration if the detector is mounted remotely from the M2A. When zero air is applied to the M2A during a fresh air adjustment, the M2A will freeze the display reading at the lowest response and the M2A will continue to display this reading and retain it in its memory until the fresh air adjustment procedure is completed.
  • Page 52 Screw the zero air cylinder into the fixed flow regulator. Turn the regulator knob counterclockwise to open the regulator. Allow zero air to flow for two minutes. If there was gas present causing a reading on the M2A, the reading should decrease and stabilize after two minutes.
  • Page 53 (ie. a 0 - 300 ppm CO detector must be calibrated with a CO concentration between 30 and 300 ppm). The M2A will perform a span operation. The display will indicate SPAN Gas PASS for a few seconds, then indicate SPAN Gas SAVED before indicating Leaving CAL Mode for a few seconds.

  • Page 54: Calibration, Oxygen Version

    This feature enables one person to perform a calibration if the detector is mounted remotely from the M2A. When zero air is applied to the M2A during a fresh M2A Transmitter Operator’s Manual...
  • Page 55 When calibration gas is applied to the M2A during a zero adjustment, the M2A will freeze the display reading at the lowest 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 zero adjustment procedure is completed.

  • Page 56: Replacing Components Of The M2A

    During this 1 minute period, the signal output will remain fixed at 17.4 mA and the relays will remain in their non-alarm state to avoid unwanted alarms while the calibration gas clears from the detector. At the end of the 1 minute period, the REMOVE CAL GAS message will stop appearing and the M2A will return to normal operation.
  • Page 57 If you are replacing a CO sensor, remove the rubber boot and charcoal filter from the old sensor. NOTE: RKI instruments recommends replacing the charcoal disk filter whenever a CO sensor is replaced. If you are replacing the 65-2428 explosion-proof H S detector’s sensor, remove the rubber boot and spacer...
  • Page 58 The charcoal filter is used to scrub out interfering gases from the environment being monitored, such as H S and certain 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.
  • Page 59 Carefully match the replacement sensor’s male pins with the 2-socket pattern in the top section and plug it Make sure the cap gasket is in place and screw the detector cap back on to the detector housing. 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.
  • Page 60 Plug the sensor back into the four-socket pattern in the detector housing body. Make sure the cap gasket is in place and screw the detector housing cap back onto the detector housing body. Turn on or reconnect power to the M2A. M2A Transmitter Operator’s Manual 1.800.561.8187...

  • Page 61: Chapter 8: Rs-485 Modbus Output

    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.
  • Page 62 Adding an M2A to an Existing M2 Modbus Installation with Recommended Wiring An M2A can be wired into an existing M2 Modbus system. The shape of the terminal PCB will be different but the wiring connections are identical and the ground jumper on the M2A must still be removed.
  • Page 63 Modbus system, this jumper has no function. When the M2A is installed in a Modbus system, this jumper must be installed in an M2A that is at the end of a 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 &...

  • Page 64: Using The M2A In A 4-Wire Modbus System

    Using the M2A in a 4-wire Modbus System Although the M2A is a 2-wire Modbus RTU device, it can be used with a 4-wire Modbus controller if the system wiring is modified as follows: • Connect the controller’s TxD0 and RxD0 wires together and use this connection as the 2-wire Modbus D0 signal.
  • Page 65 If you wish to change some of the adjustments made, press and release the DOWN/NO button. The DO OVER? YES/NO message will display. Press and release the UP/YES button. The Re-do MB Setup message will display and the M2A will return to the first adjustable parameter. Go back to step 3 and continue.

  • Page 66: Supported Modbus Functions

    Supported Modbus Functions The M2A supports Function Code 03: Read Holding Registers and Function Code 16: Write Registers. Function Code 03: Read Holding Registers There are a total of 40 registers available to be read via this Function Code. Registers 1 - 2 The format (bit &...
  • Page 67 Register 3 Register 3 is the supply voltage (0.1 volt per count). Registers 4 - 11 The 16 bytes in these registers contain the same ASCII text information that is displayed on the M2A’s OLED (not NULL Terminated). Register 12 Register 12 is the range (full scale readout).
  • Page 68 Integer values are in seconds. Register 33 Register 33 is zero suppression. Toxics and LEL: 0%-6% of full scale Oxygen: 0%-0.7% Oxygen The decimal point location is the same as specified in Register 1. M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 69 13=LEL Null Operation Failed 14=Operation Not Performed Register 39 Register 39 is the auto-zero disable. 0=AutoZero Enabled 1=AutoZero Disabled Register 40 Register 40 is the remote configuration register access level 0=None 1=Alarm Reset M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 70 Function Code 16: Write Registers There are 21 registers in Function Code 16 that can be used to write to the M2A. This section only describes Register 16 because it can be used to reset an alarm condition. For a complete description of Function Code 16, see “Appendix C: Function Code 16 Registers”...

  • Page 71: Chapter 9: Parts List

    Chapter 9: Parts List Table 20 lists replacement parts and accessories for the M2A Transmitter. Table 20: Parts List Part Number Description 06-1248RK Calibration kit sample tubing (3/16 in. x 5/16 in.; specify length when ordering) 07-0033RK Cap gasket, for CSA type CO and H...
  • Page 72 CT-7 Series detector, 0 - 3.00 ppm chlorine (includes sensor) 65-2302-CL2-5 CT-7 Series detector, 0 - 5.00 ppm chlorine (includes sensor) 65-2302-CL2-10 CT-7 Series detector, 0 - 10.0 ppm chlorine (includes sensor) M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 73 Oxygen detector, capillary type 65-2514RK Oxygen detector, CSA version, capillary type (includes plug-in sensor) 71-0305RK M2A Transmitter Operator’s Manual (this document) 81-0002RK-01 Calibration cylinder, 50% LEL hydrogen in air, 34 liter steel 81-0002RK-03 Calibration cylinder, 50% LEL hydrogen in air, 103 liter...
  • Page 74 81-0192RK-04 Calibration cylinder, 2 ppm Cl in nitrogen, 34 liter aluminum 81-0196RK-02 Calibration cylinder, 10 ppm HCN in nitrogen, 58 liter 81-0196RK-04 Calibration cylinder, 10 ppm HCN in nitrogen, 34 liter aluminum M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...
  • Page 75 ESM-01 plug-in sensor, 0 - 3.00 ppm chlorine ESM-K01D-CL2-10 ESM-01 plug-in sensor, 0 - 10.0 ppm chlorine NC-6205-01 Hydrogen specific LEL detector, catalytic type, UL version NC-6205-05 Hydrogen specific LEL detector, catalytic type, CSA version M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...

  • Page 76: Appendix A: Control Button Quick Reference Guide

    Appendix A: Control Button Quick Reference Guide The M2A’s control buttons allow access to operational modes, resetting of alarms, and display of the Information Screen. Table 21 shows which button combinations perform these functions and which parameters are available for adjustment while in the operational modes. While in these modes, display prompts showing a “?” require you to respond by pressing either the UP/YES (for yes) or DOWN/NO (for no) button.

  • Page 77: Appendix B: Plc And Dcs Device Wiring

    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. M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com...
  • Page 78 See Figure 36 below for field wiring connections to the M2A. 24 VDC Power Supply 24 VDC + Alarm Device Power 24 VDC - Fail Alarm Device 4 - 20 mA In (S) (24 VDC) - Alarm 1 Alarm Device...

  • Page 79: Appendix C: Function Code 16 Registers

    Appendix C: Function Code 16 Registers The M2A supports Function Code 16 that allows writing to the M2A. There are 21 registers in this Function Code. Register 1 Register 1 is the alarm 1 set point. Value must be an integer. Any decimals are omitted.
  • Page 80 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 be used to clear those flags. Table 23: Register 19, Clear Change Flags Bit(s) Value &...
  • Page 81 Register 21 Register 21 is the Remote Configuration Register. 0=No Remote Configuration 1=Reset Alarm M2A Transmitter Operator’s Manual 1.800.561.8187 information@itm.com www. .com...

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