RKI Instruments 65-2649XL-HC-04 Operator's Manual
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RKI Instruments 65-2649XL-HC-04 Operator's Manual

M2a-xl transmitter
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65-2649XL-HC-04
M2A-XL Transmitter
Operator's Manual
Part Number: 71-0644
Revision: P1
Released: 11/6/23
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2649XL-HC-04

  • Page 1 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Part Number: 71-0644 Revision: P1 Released: 11/6/23 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 For most applications, typical calibration frequencies are between 6 and 12 months but can be more often or less often based on your usage. 2 • 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 3 We do not assume indemnification for any accident or damage caused by the operation of this gas monitor and our warranty is limited to the replacement of parts or our complete goods. Warranty covers parts and labor performed at RKI Instruments, Inc. only, and does not cover field labor or shipment of parts back to RKI.

  • Page 4: Table Of Contents

    Selecting the Gas Type ............32 4 • 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......60 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2649XL-HC-04 M2A-XL Transmitter. This chapter also describes the 65-2649XL-HC-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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Specifications • 7...

  • 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 IR LEL Detector Calibration Adapter/ Splash Guard Figure 1: M2A-XL External Components 8 • Overview 65-2649XL-HC-04 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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual External 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 RKI INSTRUMENTS Opening for Wire Entry M2A-XL TRANSMITTER Junction Box Figure 2: M2A-XL Internal Components 10 • Internal Description 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 11 The 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). 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Internal Description • 11...
  • Page 12 Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 43 for a description of using the M2A-XL-XL in a Modbus system. 12 • Internal Description 65-2649XL-HC-04 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) 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Internal 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 • Internal Description 65-2649XL-HC-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, Plugged 2.82 3/4 NPT Conduit Port Ø 0.25, 2X 1.00 Figure 5: Outline & Mounting Dimensions, M2A-XL Junction Box 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Overview • 15...
  • Page 16 M2A-XL junction box. See the “Chapter 9: Parts List” on page 55 for available tubing. 16 • Mounting the M2A-XL Transmitter 65-2649XL-HC-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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Wiring the M2A-XL Transmitter • 17...
  • Page 18 (for G roups C and D environments) IR LEL Detector Calibration A dapter/Splash Guard Figure 7: Wiring the Detector to the M2A-XL 14. Reinstall the detector terminal strip into its socket. 18 • Wiring the M2A-XL Transmitter 65-2649XL-HC-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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Wiring the M2A-XL Transmitter • 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 • Wiring the M2A-XL Transmitter 65-2649XL-HC-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 38. Verify that the M2A-XL is in a fresh air environment (environment known to be free of combustible or toxic gas vapors and of normal oxygen content, 20.9%).
  • Page 22 4. Press and release the ENTER button. The M2A-XL 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-XL will return to normal operation. 22 • Start Up 65-2649XL-HC-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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Overview • 23...

  • Page 24: 4 - 20 Ma Signal Output Operation

    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 • 4 - 20 mA Signal Output Operation 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 25 NOTE: If the ENTER button is pressed while the M2A-XL is in an alarm 1 condition, the 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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Alarm Indications • 25...
  • Page 26 • The gas reading is replaced by the FAIL message. • 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 • Alarm Indications 65-2649XL-HC-04 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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Alarm Indications • 27...

  • Page 28: 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. 28 • Overview 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 29 (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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Viewing & Changing M2A-XL Parameters • 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 • Viewing & Changing M2A-XL Parameters 65-2649XL-HC-04 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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Viewing & Changing M2A-XL Parameters • 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 65-2649XL-HC-04 M2A-XL is factory setup for general hydrocarbons (HC). 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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Selecting the Gas Type • 33...
  • Page 34 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 34 • Selecting the Gas Type 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...

  • Page 35: Chapter 7: Maintenance

    This ribbon cable plugs into a connector on the top edge of the control PCB and on the bottom of the terminal PCB. 3. If the power difficulties continue, contact RKI for further instruction. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Overview • 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 • Troubleshooting 65-2649XL-HC-04 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 combustible gas 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: The detector must be calibrated with a gas concentration between 10% and 100% of the channel’s full scale value (ie. between 10% LEL and 100% LEL). 38 • Calibration 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 39 CAL Mode for a few seconds before showing FreshAir Adjust?. If you want to exit Calibration Mode, press and release the DOWN/NO button. The M2A- XL will indicate Leaving CAL Mode and the M2A-XL will return to normal operation. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Calibration • 39...
  • Page 40 6. Unscrew the calibration gas cylinder from the fixed flow regulator. The M2A-XL will continue to display the maximum gas response on the display and retain the response level in its memory. 40 • Calibration 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...

  • Page 41: Replacing The Ir Lel Detector

    If necessary for environmental conditions, apply thread sealant or Teflon tape to the hub and/or detector threads to seal them. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Replacing the IR LEL Detector • 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 • Replacing the IR LEL Detector 65-2649XL-HC-04 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 Modbus Signal Name Label (RS-485 Name) Common 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Overview • 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 • Wiring the M2A-XL in a Modbus System 65-2649XL-HC-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 remain installed. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Wiring the M2A-XL in a Modbus System • 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 • Wiring the M2A-XL in a Modbus System 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...

  • Page 47: 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. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Using the M2A-XL in a 4-wire Modbus System • 47...
  • Page 48 NOTE: All M2A-XLs 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. 48 • Modbus Mode 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...

  • Page 49: Supported Modbus Functions

    1 = Initialization 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 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 49...
  • Page 50 Fail Relay Status 0 = Not Energized 1 = Energized Alarm 2 Relay Status 0 = Not Energized 1 = Energized Alarm 1 Relay Status 0 = Not Energized 1 = Energized 50 • Supported Modbus Functions 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 51 Register 26 Register 26 is the alarm 1 ON delay. Integer values are in seconds. Register 27 Register 27 is the alarm 1 OFF delay. Integer values are in seconds. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 51...
  • Page 52 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. Register 38 Register 38 is the calibration outcome. Upper=Gas Operation Lower=Air Operation 52 • Supported Modbus Functions 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 53 Function Code 16, Register 21, that value is automatically copied to Function Code 03, Register 40. The M2A firmware looks to Function Code 03, Register 40 for the remote configuration setting. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 53...
  • Page 54 Function Code 16, Register 21, that value is automatically copied to Function Code 03, Register 40. The M2A firmware looks to Function Code 03, Register 40 for the remote configuration setting. 54 • Supported Modbus Functions 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...

  • Page 55: Chapter 9: Parts List

    45-6132RK Termination and ground jumper 61-0190RK-HC HC LEL detector, IR type 71-0644 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual (this document) 81-0004RK-01 Calibration cylinder, 50% LEL propane in air, 34 liter steel 81-0004RK-03 Calibration cylinder, 50% LEL propane in air, 103 liter...

  • 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 • Supported Modbus Functions 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 57 Adjustable or Viewable Parameters Combination Performed • Enable or Disable Modbus Modbus Mode Press and Hold DOWN/NO and • Slave ID ENTER for 5 • Baud Rate seconds • Parity • Response Delay 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 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 • Supported Modbus Functions 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 59 4 - 20 mA In (S) (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 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 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 • Supported Modbus Functions 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 61 Register 14 is the noise filter. Integer value is in seconds (0-60 in 5 second increments). Register 15 Register 15 is the calibration timeout. Value is in minutes (5, 10, 15, 20, 25, or 30). 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 61...
  • Page 62 This register can be used to clear those flags. Table 17: Register 19, Clear Change Flags Bit(s) Value & Field [15:2] Unused Write “1” to this bit to clear “Gas Type Changed” flag 62 • Supported Modbus Functions 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual...
  • Page 63 Function Code 16, Register 21, that value is automatically copied to Function Code 03, Register 40. The M2A firmware looks to Function Code 03, Register 40 for the remote configuration setting. 65-2649XL-HC-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 63...

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