RKI Instruments 65-2640XL-04 Operator's Manual
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RKI Instruments 65-2640XL-04 Operator's Manual

M2a transmitter
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65-2640XL-04
M2A Transmitter
Operator's Manual
Part Number: 71-0611
Revision: P1
Released: 10/20/22
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2640XL-04

  • Page 1 65-2640XL-04 M2A Transmitter Operator’s Manual Part Number: 71-0611 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 • 65-2640XL-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 ............33 4 • 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......60 65-2640XL-04 M2A Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2640XL-04 M2A Transmitter. This chapter also describes the 65-2640XL-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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 1: Introduction • 7...

  • Page 8: Chapter 2: Description

    3/4 NPT Conduit Hub Magnetic W and W indow 3/4 NPT Conduit Hub M2A-XL Junction Detector Junction Box Combustible G as Detector Calibration Adapter/ Splash Guard Figure 1: M2A External Components 8 • Chapter 2: Description 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 9 (near the M2A junction box is optimal for ease of calibration). The calibration adapter/splash guard also protects the detector from splashing water or direct water spray. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 9...

  • Page 10: 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 RK I IN STRUMENTS Opening for W ire Entry M2A-XL TRANSMITTER Junction Box Figure 2: M2A Internal Components 10 • Chapter 2: Description 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 11 4 - 20 mA output signal to another device such as a gas monitoring controller, chart recorder, or programmable controller (PLC). 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 11...
  • Page 12 Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 45 for a description of using the M2A in a Modbus system. 12 • Chapter 2: Description 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 13 • Saves settings UP (YES) • Changes the displayed setting • Enters the Calibration Program • Enters Gas Type Mode (press with DOWN/NO button) • Enters Configuration Mode (press with ENTER button) 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 13...
  • Page 14 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. 14 • Chapter 2: Description 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 15: Chapter 3: Installation & Startup

    Mount the detector junction box with the detector facing down as shown in Figure 6. 3/4 NPT 4.86 5.66 Conduit Port 2.82 3/4 NPT Conduit Port Ø 0.25, 2X 1.00 Figure 5: Outline & Mounting Dimensions, M2A Junction Box 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 15...
  • Page 16 M2A junction box. See the “Chapter 9: Parts List” on page 56 for available tubing. 16 • Chapter 3: Installation & Startup 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 17: Wiring The M2A Transmitter

    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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 17...
  • Page 18 CAUTION: If shielded cable is used, leave the cable shield’s drain wire disconnected and insulated at the detector junction box. You will connect the opposite end of the cable’s drain wire to the M2A junction box’s chassis (earth) ground. 18 • Chapter 3: Installation & Startup 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 19 15. 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 19...
  • Page 20 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. 20 • Chapter 3: Installation & Startup 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 21 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 21...

  • Page 22: 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 40.
  • Page 23 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 23...

  • Page 24: 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. 24 • Chapter 4: Operation 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 25: 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). 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 4: Operation • 25...

  • Page 26: 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. 26 • Chapter 4: Operation 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 27 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 4: Operation • 27...
  • Page 28 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 22. 28 • Chapter 4: Operation 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 29: Chapter 5: Configuration Mode

    If the currently displayed parameter is OK, press the ENTER button to proceed to the next parameter. Table 5 lists the M2A parameters you can set. Table 5 also lists the factory set value for each parameter. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 5: Configuration Mode • 29...
  • Page 30 If set as LATCH, you must press the ENTER button to reset the (LATCH) alarm 2 circuit after the alarm 2 condition passes. If set as SELF-RST, the M2A automatically resets the alarm 2 circuit after the alarm 2 condition passes. 30 • Chapter 5: Configuration Mode 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 31 If set to Disabled, the Auto Zero function is turned off. 4. When you have scrolled through all the adjustable parameters, SAVE IT? YES/NO appears on the display. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 5: Configuration Mode • 31...
  • Page 32 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. 32 • Chapter 5: Configuration Mode 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 33: 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 65-2640XL-04 is methane, but it may be different depending on the calibration. 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 34 See “Chapter 5: Configuration Mode” on page 29 for a complete description of Configuration Mode. 7. When you have reviewed and accepted the last item in Configuration Mode by pressing the ENTER button, display will ask SAVE IT? YES/NO. 34 • Chapter 6: Gas Type Mode 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 35 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 6: Gas Type Mode • 35...

  • Page 36: Chapter 7: Maintenance

    Verify a display reading of 0% LEL. Investigate significant changes in the reading. Quarterly Calibrate the M2A as described in “Calibration” on page 40. See “Calibration Frequency” on page 39 for a discussion of calibration frequency guidelines. 36 • Chapter 7: Maintenance 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 37: 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 37...
  • Page 38 • 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. 38 • Chapter 7: Maintenance 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 39: 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 combustible gas transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months.

  • Page 40: 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. 40 • Chapter 7: Maintenance 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 41 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 41...
  • Page 42 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. 42 • Chapter 7: Maintenance 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 43 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 43...

  • Page 44: Replacing The Combustible Gas Detector

    NOTE: Allow the replacement detector to warm up for 15 minutes before you continue with the next step. 11. Calibrate the replacement detector as described in “Calibration” on page 40. 44 • Chapter 7: Maintenance 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 45: Chapter 8: Rs-485 Modbus Output

    Figure 10, the ground jumper should be installed. If the M2A is wired in a Modbus system as shown in Figure 9, the ground jumper should be removed. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 45...
  • Page 46 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. 46 • Chapter 8: RS-485 Modbus Output 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 47 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 47...
  • Page 48 ID = 3 ID = 4 ID = 127 Up to 128 M2As can be connected without a repeater Figure 12: Multiple M2As in a Two Branch Configuration 48 • Chapter 8: RS-485 Modbus Output 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 49: 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 49...
  • Page 50 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. 50 • Chapter 8: RS-485 Modbus Output 65-2640XL-04 M2A Transmitter Operator’s Manual...

  • Page 51: 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 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 51...
  • Page 52 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). 52 • Chapter 8: RS-485 Modbus Output 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 53 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 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 53...
  • Page 54 This is zero based (e.g. January=0 and the 1st=0). Register 37 Register 37 is the calibration year. Register 38 Register 38 is the calibration outcome. Upper=Gas Operation Lower=Air Operation 54 • Chapter 8: RS-485 Modbus Output 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 55 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 65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 55...

  • Page 56: Chapter 9: Parts List

    M2A junction box 45-6132RK Termination jumper 61-0140RK LEL detector, catalytic type 71-0611 65-2640XL-04 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 81-0004RK-01...

  • Page 57: 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 65-2640XL-04 M2A Transmitter Operator’s Manual Appendix A: Control Button Quick Reference Guide • 57...

  • Page 58: 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 45. 58 • Appendix B: PLC and DCS Device Wiring 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 59 Alarm 1 Alarm Device Detector Controller Wiring (PLC, DCS) Alarm 2 Alarm Device Modbus Wiring Typical Alarm Wiring Shown Figure 13: PLC and DCS Device Wiring 65-2640XL-04 M2A Transmitter Operator’s Manual Appendix B: PLC and DCS Device Wiring • 59...

  • Page 60: 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 60 • Appendix C: Function Code 16 Registers 65-2640XL-04 M2A Transmitter Operator’s Manual...
  • Page 61 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. 65-2640XL-04 M2A Transmitter Operator’s Manual Appendix C: Function Code 16 Registers • 61...
  • Page 62 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 62 • Appendix C: Function Code 16 Registers 65-2640XL-04 M2A Transmitter Operator’s Manual...

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