RKI Instruments 65-2658XL-CH4-4 Operator's Manual
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RKI Instruments 65-2658XL-CH4-4 Operator's Manual

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65-2658XL-CH4-4
M2A-XL Transmitter
Operator's Manual
Part Number: 71-0622
Revision: P1
Released: 12/15/22
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2658XL-CH4-4

  • Page 1 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Part Number: 71-0622 Revision: P1 Released: 12/15/22 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 Typical calibration frequencies for most applications are between 6 and 12 months, but can be required more often or less often based on your usage. 2 • 65-2658XL-CH4-4 M2A-XL 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 ............32 4 • 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......60 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2658XL-CH4-4 M2A-XL Transmitter. This chapter also describes the 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the M2A-XL. About the M2A-XL Transmitter The M2A-XL transmitter is a fixed mount, continuous-monitoring detector head.

  • Page 7: Specifications

    M2A-XL and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the M2A- XL as described in this manual. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 1: Introduction • 7...

  • Page 8: Chapter 2: Description

    Mounting Hole (2x) Terminal Strip W indow Magnetic W and 3/4 NPT Conduit Hub Detector M2A-XL Junction Box Junction Box IR CH4 Detector Calibration Adapter/ Splash Guard Figure 1: M2A-XL External Components 8 • Chapter 2: Description 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 9 (near the M2A-XL junction box is optimal for ease of calibration). The calibration adapter/splash guard also protects the detector from splashing water or direct water spray. 65-2658XL-CH4-4 M2A-XL 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, Plugged Control PCB Terminal PCB RKI INSTRUMENTS 3/4 NPT Conduit Opening for Wire Entry M2A-XL T RANSMITTER M2A-XL Junction Box Figure 2: M2A-XL Internal Components 10 • Chapter 2: Description 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 11 S terminal is used if you want to connect the 4 - 20 mA output signal to another device such as a gas monitoring controller, chart recorder, or programmable controller (PLC). 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 2: Description • 11...
  • Page 12 Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 43 for a description of using the M2A-XL in a Modbus system. 12 • Chapter 2: Description 65-2658XL-CH4-4 M2A-XL 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) 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 2: Description • 13...
  • Page 14 The alarm 2 LED is on when the M2A-XL is experiencing an alarm 2 condition. • RX & TX LED’s These LED’s indicate data being received (RX) and transmitted (TX) when the M2A-XL’s Modbus output is operating. 14 • Chapter 2: Description 65-2658XL-CH4-4 M2A-XL 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 Plugged Conduit Port Ø 0.25, 2X 1.00 Figure 5: Outline & Mounting Dimensions, M2A-XL Junction Box 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 3: Installation & Startup • 15...
  • Page 16 M2A-XL junction box. See the “Chapter 9: Parts List” on page 55 for available tubing. 16 • Chapter 3: Installation & Startup 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 17: Wiring The M2A-Xl 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. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 3: Installation & Startup • 17...
  • Page 18 IR CH4 D etector D env ironments) Calibration A dapter/Splash Guard Figure 7: Wiring the Detector to the M2A-XL 14. Reinstall the detector terminal strip into its socket. 18 • Chapter 3: Installation & Startup 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 19 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. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 3: Installation & Startup • 19...
  • Page 20 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. 20 • Chapter 3: Installation & Startup 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 21: Start Up

    “Adjusting the Fresh Air Reading.” Adjusting the Fresh Air Reading When the M2A-XL is shipped from RKI Instruments, Inc., it is factory calibrated. If a full calibration is desired at startup, see “Calibration” on page 38.
  • Page 22 SPAN w/Cal Gas?. 11. Press and release the DOWN/NO button. The display will indicate Leaving CAL Mode and the M2A-XL will return to normal operation. 22 • Chapter 3: Installation & Startup 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 23: Chapter 4: Operation

    M2A-XL. 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. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 4: Operation • 23...

  • Page 24: 4 - 20 Ma Signal Output Operation

    • Gas reading alternates with ALARM-1 message • A2 LED is on Alarm 2 Increasing gas reading at or above the alarm 2 setpoint • Gas reading alternates with ALARM-2 message 24 • Chapter 4: Operation 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 25 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 the alarm 1 setpoint. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 4: Operation • 25...
  • Page 26 • 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. 26 • Chapter 4: Operation 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 27 2. When the input power increases above 10.0 volts, the M2A-XL will begin its warm-up sequence. 3. Verify that the M2A-XL enters normal operation after its warm-up sequence. If necessary, perform a fresh air adjustment. See “Adjusting the Fresh Air Reading” on page 21. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 4: Operation • 27...

  • Page 28: 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-XL parameters you can set. Table 5 also lists the factory set value for each parameter. 28 • Chapter 5: Configuration Mode 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 29 2 condition is initiated. 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. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 5: Configuration Mode • 29...
  • Page 30 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. 30 • Chapter 5: Configuration Mode 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 31 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-XL returns to normal operation. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 5: Configuration Mode • 31...

  • Page 32: Chapter 6: Gas Type Mode

    This chapter describes how to use Gas Type Mode to select the M2A-XL’s gas type. The gas type determines the target gas and detection range. CAUTION: The 65-2658XL-CH4-4 M2A-XL is factory setup for 0 - 100% volume methane ). Do not change the Gas Type setting.
  • Page 33 Config, then display the target gas and the detection range for a few seconds before returning to Configuration Mode. Repeat steps 6 - 8 until the settings are as desired. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 6: Gas Type Mode • 33...
  • Page 34 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 34 • Chapter 6: Gas Type Mode 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 35: Chapter 7: Maintenance

    PCB and on the bottom of the terminal PCB. 3. If the power difficulties continue, contact RKI for further instruction. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 35...
  • Page 36 • 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. 36 • Chapter 7: Maintenance 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 37: Calibration Frequency

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

  • Page 38: Calibration

    NOTE: While in the calibration program, if there is no switch activity for the calibration time- out period the unit will return to normal operation. See “Viewing & Changing M2A-XL Parameters” on page 28 for instructions to set the calibration time-out. 38 • Chapter 7: Maintenance 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 39 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. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 39...
  • Page 40 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. between 10% volume and 100% volume). 40 • Chapter 7: Maintenance 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 41: Replacing The Ir Ch Detector

    7. Connect the detector leads to the terminal block the same way the old detector was wired (see Figure 7 on page 18). 8. Screw the calibration adapter/splash guard onto the new detector. 9. Reinstall the detector junction box cover. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 41...
  • Page 42 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 38. 42 • Chapter 7: Maintenance 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 43: Chapter 8: Rs-485 Modbus Output

    The MODBUS terminal strip is located on the terminal PCB (see Figure 3 on page 11). 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 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 43...
  • Page 44 An M2A-XL 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-XL must still be removed. 44 • Chapter 8: RS-485 Modbus Output 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 45 An M2A-XL 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-XL must still remain installed. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 45...
  • Page 46 ID = 3 ID = 4 ID = 127 Up to 128 M2As can be connected without a repeater Figure 12: Multiple M2A-XLs in a Two Branch Configuration 46 • Chapter 8: RS-485 Modbus Output 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 47: Using The M2A-Xl In A 4-Wire Modbus System

    2. To exit Modbus Mode, press and release the DOWN/NO button. The M2A-XL will return to normal operation. To continue in Modbus Mode, press and release the UP/YES button. The current ENABLED/DISABLED setting will appear. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 47...
  • Page 48 Master’s preparedness to receive responses might be delayed. 4. When you have scrolled through all the adjustable parameters, SAVE IT? YES/NO appears on the display. 48 • Chapter 8: RS-485 Modbus Output 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 49: Supported Modbus Functions

    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) 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 49...
  • Page 50 Alarm 1 Status 0 = No Alarm 1 = Unacknowledged Alarm 2 = Acknowledged Alarm 3 = Unused Code Overscale Status 0 = Not Overscale 1 = Overscale 50 • Chapter 8: RS-485 Modbus Output 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 51 Registers 20 - 22 are the Gas Units String (NULL Terminated). Register 23 Register 23 is the alarm 1 trigger. 0=Decreasing 1=Increasing Register 24 Register 24 is the alarm 1 normal relay state. 0=Normally De-Energized 1=Normally Energized 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 51...
  • Page 52 The decimal point location is the same as specified in Register 1. Register 34 Register 34 is noise filter. Integer values in seconds. 0-60 in 5 second increments. 52 • Chapter 8: RS-485 Modbus Output 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...
  • Page 53 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” on page 60. 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 53...
  • Page 54 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 54 • Chapter 8: RS-485 Modbus Output 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual...

  • Page 55: Chapter 9: Parts List

    45-6132RK Termination and ground jumper 61-0192RK-CH4 detector, 0 - 100% volume, IR type 71-0622 65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual (this document) 81-0013RK-01 Calibration cylinder, 50% volume CH in nitrogen, 34 liter steel 81-0076RK-01 Zero air calibration cylinder, 34 liter steel...

  • Page 56: Appendix A: Control Button Quick Reference Guide

    • Alarm Off Delay (if self-resetting) • Zero Suppression • Noise Filter • Calibration Time-out Period Gas Type Mode Press and Hold Gas Type UP/YES and DOWN/NO for 5 seconds 56 • Appendix A: Control Button Quick Reference Guide 65-2658XL-CH4-4 M2A-XL Transmitter...
  • Page 57 Performed • Enable or Disable Modbus Modbus Mode Press and Hold DOWN/NO and • Slave ID ENTER for 5 • Baud Rate seconds • Parity • Response Delay 65-2658XL-CH4-4 M2A-XL Transmitter Appendix A: Control Button Quick Reference Guide • 57...

  • Page 58: Appendix B: Plc And Dcs Device Wiring

    • If the M2A-XL will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 43. 58 • Appendix B: PLC and DCS Device Wiring 65-2658XL-CH4-4 M2A-XL Transmitter...
  • Page 59 (24 VDC) - 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 65-2658XL-CH4-4 M2A-XL Transmitter Appendix B: PLC and DCS Device Wiring • 59...

  • Page 60: Appendix C: Function Code 16 Registers

    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. Register 8 Register 8 is the alarm 2 trigger. 0=Decreasing 1=Increasing 60 • Appendix C: Function Code 16 Registers 65-2658XL-CH4-4 M2A-XL Transmitter...
  • Page 61 Register 16 is explained in Supported Modbus Functions in the M2A-XL 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. 65-2658XL-CH4-4 M2A-XL Transmitter Appendix C: Function Code 16 Registers • 61...
  • Page 62 Write “1” to this bit to clear “Configuration Changed” flag 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 65-2658XL-CH4-4 M2A-XL Transmitter...

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