RKI Instruments 65-2640XL-05-04 Operator's Manual
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RKI Instruments 65-2640XL-05-04 Operator's Manual

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65-2640XL-05-04
M2A-XL Transmitter
Operator's Manual
Part Number: 71-0625
Revision: P1
Released: 12/21/22
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2640XL-05-04

  • Page 1 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Part Number: 71-0625 Revision: P1 Released: 12/21/22 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-05-04 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 ............33 4 • 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......60 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2640XL-05-04 M2A-XL Transmitter. This chapter also describes the 65-2640XL-05-04 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. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 1: Introduction • 7...

  • Page 8: Chapter 2: Description

    Terminal Mounting Hole (2x) Strip Window Magnetic Wand 3/4 NPT Conduit Hub M2A-XL Junction Box Detector Junction Box Combustible Gas Detector Calibration Adapter/ Splash Guard Figure 1: M2A-XL External Components 8 • Chapter 2: Description 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 9 The flame arrestor guard protects the flame arrestor from impact damage. Four color-coded leads extend from the top of the detector. The leads allow you to connect the detector to the terminal strip. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 2: Description • 9...

  • Page 10: Internal Description

    3/4 NPT Conduit Opening, Plugged Control PCB Terminal PCB RK I 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 65-2640XL-05-04 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). 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 2: Description • 11...
  • Page 12 Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 44 for a description of using the M2A-XL in a Modbus system. 12 • Chapter 2: Description 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 13 The push button switches are located along the bottom edge of the control PCB (see Figure 4). The UP/YES button is on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right. 65-2640XL-05-04 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 65-2640XL-05-04 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 65-2640XL-05-04 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 56 for available tubing. 16 • Chapter 3: Installation & Startup 65-2640XL-05-04 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. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 3: Installation & Startup • 17...
  • Page 18 2 inches (for Group B environments) or 18 inches (for Groups C and D environments) Detector J-Box Combustible Gas Detector Calibration Adapter/Splash Guard Figure 7: Wiring the Detector to the M2A-XL 18 • Chapter 3: Installation & Startup 65-2640XL-05-04 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. 65-2640XL-05-04 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 65-2640XL-05-04 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 40.
  • Page 22 SPAN w/Cal Gas?. 5. 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 65-2640XL-05-04 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. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 4: Operation • 23...

  • Page 24: 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). 24 • Chapter 4: Operation 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 25: Alarm Indications

    1 and alarm 2 relay settings in Configuration Mode. The following sections describe the standard factory setting for these relays which is N. DE-EN. The fail relay is factory set as N. EN and is not user-adjustable. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 4: Operation • 25...
  • Page 26 NOTE: If the M2A-XL 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. 26 • Chapter 4: Operation 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 27 • 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. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 4: Operation • 27...
  • Page 28 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. 28 • Chapter 4: Operation 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 29: Chapter 5: Configuration Mode

    Table 5 lists the M2A-XL parameters you can set. Table 5 also lists the factory set value for each parameter. Table 5: Configuration Parameters Parameter Description (Factory Set Value) ALARM-1 (level) The gas reading at which the M2A-XL initiates an alarm 1 condi- (10% LEL) tion. 65-2640XL-05-04 M2A-XL 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-XL automatically resets the alarm 2 circuit after the alarm 2 condition passes. 30 • Chapter 5: Configuration Mode 65-2640XL-05-04 M2A-XL 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-05-04 M2A-XL 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-XL returns to normal operation. 32 • Chapter 5: Configuration Mode 65-2640XL-05-04 M2A-XL 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-05-04 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-XL 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-05-04 M2A-XL 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-05-04 M2A-XL Transmitter Operator’s Manual Chapter 6: Gas Type Mode • 35...

  • Page 36: Chapter 7: Maintenance

    PCB and on the bottom of the terminal PCB. 3. If the power difficulties continue, contact RKI for further instruction. 36 • Chapter 7: Maintenance 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 37 • 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. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 37...

  • Page 38: 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 39 10. Add 1 minute to the length of time determined in Step 6. This is the response time for the detector. When performing a zero adjustment or span adjustment, gas must be applied for this length of time. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 39...

  • Page 40: Calibration

    Touching the glass and removing the wand is the same as pressing and releasing a button. Touching the glass and keeping the wand in place is the same as pressing and holding a button. 40 • Chapter 7: Maintenance 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 41 9. Unscrew the zero air cylinder from the fixed flow regulator. Leave the calibration adapter/ splash guard’s flexible tubing connected to the regulator. The M2A-XL will continue to display the minimum gas response on the display and retain the response level in its memory. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 41...
  • Page 42 SPAN Gas SAVED before indicating Leaving CAL Mode for a few seconds. NOTE: If the span adjustment fails, see “Troubleshooting” on page 36 for recommended actions. 42 • Chapter 7: Maintenance 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 43: 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. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 43...

  • Page 44: Chapter 8: Rs-485 Modbus Output

    Figure 10, the ground jumper should be installed. If the M2A-XL is wired in a Modbus system as shown in Figure 9, the ground jumper should be removed. 44 • Chapter 8: RS-485 Modbus Output 65-2640XL-05-04 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 be removed. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 45...
  • Page 46 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. 46 • Chapter 8: RS-485 Modbus Output 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 47 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 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 47...

  • Page 48: Using The M2A-Xl 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-XL Modbus Mode parameters you can set. Table 9 also lists the factory set value for each parameter. 48 • Chapter 8: RS-485 Modbus Output 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 49 NOTE: All M2As on a Modbus network must be configured with the same baud rate and parity, and each M2A-XL must have a unique slave ID. For an M2A-XL to participate on a network, the ENABLED/DISABLED setting must be set to ENABLE. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 49...

  • Page 50: 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 50 • Chapter 8: RS-485 Modbus Output 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 51 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-XL’s OLED display (not NULL Terminated). 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 51...
  • Page 52 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 52 • Chapter 8: RS-485 Modbus Output 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 53 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. 65-2640XL-05-04 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 53...
  • Page 54 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 54 • Chapter 8: RS-485 Modbus Output 65-2640XL-05-04 M2A-XL 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-05-04 M2A-XL Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 55...

  • Page 56: Chapter 9: Parts List

    Termination and ground jumper 61-0140RK-05 LEL detector, catalytic type, CSA classified 71-0625 65-2640XL-05-04 M2A-XL 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 57: 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 65-2640XL-05-04 M2A-XL Transmitter Appendix A: Control Button Quick Reference Guide • 57...
  • Page 58 Performed • Enable or Disable Modbus Modbus Mode Press and Hold DOWN/NO and • Slave ID ENTER for 5 • Baud Rate seconds • Parity • Response Delay 58 • Appendix A: Control Button Quick Reference Guide 65-2640XL-05-04 M2A-XL Transmitter...

  • Page 59: Appendix B: Plc And Dcs Device Wiring

    (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 65-2640XL-05-04 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 65-2640XL-05-04 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. 65-2640XL-05-04 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 65-2640XL-05-04 M2A-XL Transmitter...

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