RKI Instruments 65-2646XL-05-04 Operator's Manual
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RKI Instruments 65-2646XL-05-04 Operator's Manual

M2a transmitter
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65-2646XL-05-04
M2A Transmitter
Operator's Manual
Part Number: 71-0612
Revision: P1
Released: 10/20/22
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2646XL-05-04

  • Page 1 65-2646XL-05-04 M2A Transmitter Operator’s Manual Part Number: 71-0612 Revision: P1 Released: 10/20/22 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 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. 2 • 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 3 Product Warranty 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.

  • Page 4: Table Of Contents

    Selecting the Gas Type ............34 4 • 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......64 65-2646XL-05-04 M2A Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2646XL-05-04 M2A Transmitter. This chapter also describes the 65-2646XL-05-04 M2A Transmitter Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the M2A. About the M2A Transmitter The M2A transmitter is a fixed mount, continuous-monitoring detector head.

  • Page 7: Specifications

    M2A and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the M2A as described in this manual. 7 • Chapter 1: Introduction 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 8: Chapter 2: Description

    Mounting Hole (2x) Strip 3/4 NPT Conduit Hub Magnetic Wand Window 3/4 NPT Conduit Hub M2A-XL Junction Detector Junction Box Carbon Monoxide Detector Calibration Adapter/ Splash Guard Figure 1: M2A External Components 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 8...
  • Page 9 A ground boss near the top conduit hub provides an external earth ground connection. 9 • Chapter 2: Description 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 10 The disc-shaped charcoal filter is secured to the face of the CO sensor with a rubber boot. The charcoal filter prevents interference gases (hydrogen sulfide [H S] and certain hydrocarbons) from producing false CO readings. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 10...

  • Page 11: Internal Description

    PCB which displays the gas reading and has the control buttons. 3/4 NPT Conduit Opening Control PCB Terminal PCB 3/4 NPT Conduit RKI INSTRUMENTS Opening for W ire Entry M2A-XL TRANSMITTER Junction Box Figure 3: M2A Internal Components 11 • Chapter 2: Description 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 12 4 - 20 mA output signal to another device such as a gas monitoring controller, chart recorder, or programmable controller (PLC). 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 12...
  • Page 13 Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 48 for a description of using the M2A in a Modbus system. 13 • Chapter 2: Description 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 14 PCB (see Figure 5). The UP/YES button is on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 14...
  • Page 15 The alarm 2 LED is on when the M2A is experiencing an alarm 2 condition. • RX & TX LED’s These LED’s indicate data being received (RX) and transmitted (TX) when the M2A’s Modbus output is operating. 15 • Chapter 2: Description 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 16: Chapter 3: Installation & Startup

    Mount the detector junction box with the detector facing down as shown in Figure 7. 3/4 NPT 4.86 5.66 Conduit Port 2.82 3/4 NPT Conduit Port Ø 0.25, 2X 1.00 Figure 6: Outline & Mounting Dimensions, M2A Junction Box 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 16...
  • Page 17 M2A junction box. See the “Chapter 9: Parts List” on page 60 for available tubing. 17 • Chapter 3: Installation & Startup 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 18: Wiring The M2A Transmitter

    11. Secure the detector junction box’s cover to the junction box. 12. Guide the other end of the two-conductor, shielded cable or two wires in conduit through the bottom conduit hub of the M2A junction box. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 18...
  • Page 19 The detector 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. 19 • Chapter 3: Installation & Startup 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 20 16. If shielded cable is used between the detector junction box and the M2A junction box, connect the cable’s drain wire to an available chassis (earth) ground at the M2A junction box. Do not connect the shield drain wire at the detector junction box. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 20...
  • Page 21 Table 3: Wire Size for PWR/SIG Connections Max Distance to Max Distance to Max Distance to Controller Controller w/16 Gauge Controller w/14 Gauge w/18 Gauge Wire Wire Wire 2,500 ft. 5,000 ft. 8,000 ft. 21 • Chapter 3: Installation & Startup 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 22 5. Make controller, device, and relay connections as appropriate. If shielded cable is used for the PWR/SIG connections, connect the cable shield’s drain wire to an available chassis ground at the gas monitoring controller, recording device, or programmable controller. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 22...

  • Page 23: Start Up

    “Adjusting the Fresh Air Reading.” 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” on page 41.
  • Page 24 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. The display will indicate Leaving CAL Mode and the M2A will return to normal operation. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 24...

  • Page 25: Chapter 4: Operation

    M2A. 3. Release the DOWN/NO button when you are done viewing the Information Screen. The display will return to the normal operation screen within a couple of seconds. 25 • Chapter 4: Operation 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 26: 4 - 20 Ma Signal Output Operation

    In the case of a downscale reading, the display and the signal output continue to track the reading down to -99% of full scale (1.15 mA). 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 4: Operation • 26...

  • Page 27: Alarm Indications

    M2A alerts you to an alarm 1 condition as follows: • The A1 LED turns on. • The gas reading alternates with the ALARM-1 message. • The alarm 1 relay energizes. 27 • Chapter 4: Operation 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 28 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. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 4: Operation • 28...
  • Page 29 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 23. 29 • Chapter 4: Operation 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 30: Chapter 5: Configuration Mode

    If you want to continue in Configuration Mode, press and release the UP/YES button. The target gas and the full scale will be displayed for a few seconds before the first adjustable parameter, the alarm 1 setpoint, is displayed. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 5: Configuration Mode • 30...
  • Page 31 The gas reading at which the M2A initiates an alarm 2 condition. (50 ppm) ALARM-2 (activation) Indicates if the alarm 2 circuit is activated by gas readings (Increase) increasing (Increase) or decreasing (Decrease) to the ALARM-1 Level. 31 • Chapter 5: Configuration Mode 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 32 If the calibration time-out is set to 15 mins, then M2A will return to normal operation auto- matically 15 minutes after the last button push. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 5: Configuration Mode • 32...
  • Page 33 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. 33 • Chapter 5: Configuration Mode 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 34: Chapter 6: Gas Type Mode

    CAUTION: The target gas is factory set and does not normally need to be changed. The standard setting for the 65-2646XL-05-04 is carbon monoxide. Gas Type Mode includes a 5-minute time-out feature. If you do not press a button for 5 minutes, the M2A automatically returns to normal operation.
  • Page 35 Use the UP/YES and DOWN/NO buttons to adjust a setting. See “Chapter 5: Configuration Mode” on page 30 for a complete description of Configuration Mode. 35 • Chapter 6: Gas Type Mode 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 36 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 6: Gas Type Mode • 36...

  • Page 37: Chapter 7: Maintenance

    Verify a display reading of 0 ppm. Investigate significant changes in the reading. Quarterly Calibrate the M2A as described in “Calibration” on page 41. See “Calibration Frequency” on page 40 for a discussion of calibration frequency guidelines. 37 • Chapter 7: Maintenance 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 38: Troubleshooting

    3. Increase the alarm on delay intermittent. setting in Configuration Mode. 4. If the frequent or suspect alarm difficulties continue, contact RKI for further instruction. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 38...
  • Page 39 • The detector fresh air contact RKI for further signal is low enough instruction. to cause a fail condition. • The detector is malfunctioning. • The terminal or display PCB is malfunctioning. 39 • Chapter 7: Maintenance 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 40: Calibration Frequency

    Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 3 to 6 months is adequate for most carbon monoxide transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months.

  • Page 41: Calibration

    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. 41 • Chapter 7: Maintenance 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 42 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. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 42...
  • Page 43 If you want to skip adjusting the span reading, press and release the DOWN/NO button. The display will indicate Leaving Cal Mode and the M2A will return to normal operation. 43 • Chapter 7: Maintenance 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 44 10. Disconnect the calibration adapter/splash guard’s flexible tubing from the regulator. NOTE: Do not disconnect the flexible tubing from the calibration adapter/splash guard. 11. Store the components of the calibration kit in a safe place. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 44...

  • Page 45: Replacing Components Of The Co Detector

    3. Unscrew the detector housing cap from the detector housing body. Make sure not to lose the cap gasket. 4. Unplug and remove the CO sensor with the rubber boot and charcoal filter attached. 5. Remove the rubber boot and charcoal filter from the old sensor. 45 • Chapter 7: Maintenance 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 46 If necessary for environmental conditions, apply thread sealant or Teflon tape to the hub and/or detector threads to seal them. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 46...
  • Page 47 CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step. 11. Calibrate the replacement detector as described in “Calibration” on page 41. 47 • Chapter 7: Maintenance 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 48: Chapter 8: Rs-485 Modbus Output

    The MODBUS terminal strip is located on the terminal PCB (see Figure 4 on page 12). The following signals are available at the Modbus terminal strip: Table 8: Modbus Terminal Strip Signals Modbus Terminal Label (RS-485 Modbus Signal Name Name) Common 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 48...
  • Page 49 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. 49 • Chapter 8: RS-485 Modbus Output 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 50 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 remain installed. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 50...
  • Page 51 ID = 3 ID = 4 ID = 127 Up to 128 M2As can be connected without a repeater Figure 14: Multiple M2As in a Two Branch Configuration 51 • Chapter 8: RS-485 Modbus Output 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 52: Using The M2A In A 4-Wire Modbus System

    If the currently displayed parameter setting is OK, press the ENTER button to proceed to the next parameter. Table 9 lists the M2A Modbus Mode parameters you can set. Table 9 also lists the factory set value for each parameter. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 52...
  • Page 53 NOTE: All M2As on 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. 53 • Chapter 8: RS-485 Modbus Output 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

  • Page 54: Supported Modbus Functions

    2 = Normal 3 = Warm-up 4 = Fail 5 = Calibration 6 = Post-Calibration 7 = Low Power 8 = Setup [11] Gas Type Change 0=Not Changed 1=Changed 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 54...
  • Page 55 0 = Not Energized 1 = Energized Alarm 1 Relay Status 0 = Not Energized 1 = Energized Register 3 Register 3 is the supply voltage (0.1 volt per count). 55 • Chapter 8: RS-485 Modbus Output 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 56 Integer values are in seconds. Register 27 Register 27 is the alarm 1 OFF delay. Integer values are in seconds. Register 28 Register 28 is the alarm 2 trigger. 0=Decreasing 1=Increasing 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 56...
  • Page 57 Register 36 is calibration month (upper byte) and day (lower byte). This is zero based (e.g. January=0 and the 1st=0). Register 37 Register 37 is the calibration year. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 57...
  • Page 58 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 58 • Chapter 8: RS-485 Modbus Output 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 59 NOTE: Register 40 in Function Code 03, the remote configuration register, must be set to 1 in order for Register 16 to work. Value & Field ENTER (used for “Alarm Reset”) 0=Not Pressed 1=Pressed 65-2646XL-05-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 59...

  • Page 60: Chapter 9: Parts List

    Charcoal filter disk 45-6132RK Termination and ground jumper 65-2438 CO replacement detector assembly (includes sensor), CSA version 71-0612 65-2646XL-05-04 M2A Transmitter Operator’s Manual (this docu- ment) 81-0076RK-01 Zero air calibration cylinder, 34 liter steel 81-0076RK-03 Zero air calibration cylinder, 103 liter...

  • Page 61: Appendix A: Control Button Quick Reference Guide

    • Enable or Disable Modbus Modbus Mode Press and Hold DOWN/NO and • Slave ID ENTER for 5 • Baud Rate seconds • Parity • Response Delay 65-2646XL-05-04 M2A Transmitter Operator’s Manual Appendix A: Control Button Quick Reference Guide • 61...

  • Page 62: Appendix B: Plc And Dcs Device Wiring

    • If the M2A will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 48. 62 • Appendix B: PLC and DCS Device Wiring 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 63 Alarm 1 Alarm Device Detector Controller Wiring (PLC, DCS) Alarm 2 Alarm Device Modbus Wiring Typical Alarm Wiring Shown Figure 15: PLC and DCS Device Wiring 65-2646XL-05-04 M2A Transmitter Operator’s Manual Appendix B: PLC and DCS Device Wiring • 63...

  • Page 64: Appendix C: Function Code 16 Registers

    The decimal point location is the same as specified in Register 1 of Function Code 03. Register 8 Register 8 is the alarm 2 trigger. 0=Decreasing 1=Increasing 64 • Appendix C: Function Code 16 Registers 65-2646XL-05-04 M2A Transmitter Operator’s Manual...
  • Page 65 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. 65-2646XL-05-04 M2A Transmitter Operator’s Manual Appendix C: Function Code 16 Registers • 65...
  • Page 66 Register 20 Register 20 is the AutoZero Disable. 0=AutoZero Enabled 1=AutoZero Disabled Register 21 Register 21 is the Remote Configuration Register. 0=No Remote Configuration 1=Reset Alarm 66 • Appendix C: Function Code 16 Registers 65-2646XL-05-04 M2A Transmitter Operator’s Manual...

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