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RKI Instruments 65-2649XLHC4SS Operator's Manual

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65-2649XLHC4SS
M2A Transmitter
Operator's Manual
Part Number: 71-0691
Revision: P1
Released: 10/24/24
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2649XLHC4SS

  • Page 1 65-2649XLHC4SS M2A Transmitter Operator’s Manual Part Number: 71-0691 Revision: P1 Released: 10/24/24 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 • 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 3: Product Warranty

    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 • 65-2649XLHC4SS M2A Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......59 65-2649XLHC4SS M2A Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2649XLHC4SS M2A Transmitter. This chapter also describes the 65-2649XLHC4SS 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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 1: Introduction • 7...

  • Page 8: Chapter 2: Description

    Terminal 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 External Components 8 • Chapter 2: Description 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 9: M2A Junction Box

    (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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 2: Description • 9...

  • Page 10: Magnetic Wand

    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 Internal Components 10 • Chapter 2: Description 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 11: Terminal Pcb

    4 - 20 mA output signal to another device such as a gas monitoring controller, chart recorder, or programmable controller (PLC). 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 2: Description • 11...

  • Page 12: Detector Terminal Strip

    Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 43 for a description of using the M2A in a Modbus system. 12 • Chapter 2: Description 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 13: Control Pcb

    • 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) 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 2: Description • 13...

  • Page 14: Status Leds

    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 65-2649XLHC4SS 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, Plugged 2.82 3/4 NPT Conduit Port Ø 0.25, 2X 1.00 Figure 5: Outline & Mounting Dimensions, M2A Junction Box 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 15...
  • Page 16 3. Install 3/16 inch I.D. flexible polyurethane tubing to the fitting at the bottom of the calibration adapter/splash guard and route it to an accessible area that is close to the M2A junction box. See the “” on page 54 for available tubing. 16 • Chapter 3: Installation & Startup 65-2649XLHC4SS 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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 17...
  • Page 18 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. 18 • Chapter 3: Installation & Startup 65-2649XLHC4SS M2A 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. 65-2649XLHC4SS M2A 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 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 21: 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 39.

  • Page 22: Non-Intrusive Fresh Air Signal Adjustment

    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. 22 • Chapter 3: Installation & Startup 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 23: 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. 65-2649XLHC4SS M2A 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 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 25: Alarm 1 Condition

    NOTE: If the ENTER button is pressed while the M2A 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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 4: Operation • 25...

  • Page 26: Alarm 2 Condition

    • 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 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 27: Low Power Alarm

    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 21. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 4: Operation • 27...

  • Page 28: Chapter 5: Configuration Mode

    Table 5 lists the M2A 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 initiates an alarm 1 condition. (10% LEL) 28 • Chapter 5: Configuration Mode 65-2649XLHC4SS M2A Transmitter Operator’s Manual...
  • Page 29 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. 65-2649XLHC4SS M2A 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 65-2649XLHC4SS M2A 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 returns to normal operation. 65-2649XLHC4SS M2A 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’s gas type. The gas type determines the target gas and detection range. CAUTION: The 65-2649XLHC4SS M2A is factory setup for general hydrocarbons. 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. 65-2649XLHC4SS M2A 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 65-2649XLHC4SS M2A 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. 65-2649XLHC4SS M2A 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 65-2649XLHC4SS M2A 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: Determining Response Time

    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. 38 • Chapter 7: Maintenance 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 39: 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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 39...

  • Page 40: Calibration Gas Response Memory Feature

    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 will continue to display the minimum gas response on the display and retain the response level in its memory. 40 • Chapter 7: Maintenance 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 41: Adjusting The Span Setting

    At the end of the 1 minute period, the REMOVE CAL GAS message will stop appearing and the M2A will return to normal operation. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 41...

  • Page 42: Replacing The Ir Lel 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 39. 42 • Chapter 7: Maintenance 65-2649XLHC4SS M2A 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 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 43...

  • Page 44: Ground Jumper

    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. 44 • Chapter 8: RS-485 Modbus Output 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 45: Alternate Modbus Wiring For Existing Installations

    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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 45...

  • Page 46: Termination Jumper

    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 46 • Chapter 8: RS-485 Modbus Output 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 47: 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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 47...
  • Page 48 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. 48 • Chapter 8: RS-485 Modbus Output 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 49: 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 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 49...
  • Page 50 0 = Not Energized 1 = Energized Alarm 2 Relay Status 0 = Not Energized 1 = Energized Alarm 1 Relay Status 0 = Not Energized 1 = Energized 50 • Chapter 8: RS-485 Modbus Output 65-2649XLHC4SS M2A Transmitter Operator’s Manual...
  • Page 51 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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 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. 52 • Chapter 8: RS-485 Modbus Output 65-2649XLHC4SS M2A 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. 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 53...

  • Page 54: Function Code 16: Write Registers

    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 • Chapter 8: RS-485 Modbus Output 65-2649XLHC4SS M2A Transmitter Operator’s Manual...

  • Page 55: Chapter 9: Parts List

    Regulator, with gauge and knob, 0.5 liter/minute continuous flow, for 34 liter aluminum/58 liter/103 liter calibration cylinders (cylinders with inter- nal threads) 81-1103RK-01 Calibration adapter/splash guard, with diffuser holes 65-2649XLHC4SS M2A Transmitter Operator’s Manual Chapter 9: Parts List • 55...

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

    5 seconds • Enable or Disable Modbus Modbus Mode Press and Hold DOWN/NO and • Slave ID ENTER for 5 • Baud Rate seconds • Parity • Response Delay 56 • Appendix A: Control Button Quick Reference Guide 65-2649XLHC4SS M2A Transmitter...

  • Page 57: Appendix B: Plc And Dcs Device Wiring

    NOTE: If shielded cable is used for the PWR/SIG connections, leave the cable shield’s drain wire insulated and disconnected at the M2A. You will connect the opposite end of the cable’s drain wire at the controller or device. 65-2649XLHC4SS M2A Transmitter Appendix B: PLC and DCS Device Wiring • 57...
  • Page 58 (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 58 • Appendix B: PLC and DCS Device Wiring 65-2649XLHC4SS M2A Transmitter...

  • Page 59: 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 65-2649XLHC4SS M2A Transmitter Appendix C: Function Code 16 Registers • 59...
  • Page 60 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). 60 • Appendix C: Function Code 16 Registers 65-2649XLHC4SS M2A Transmitter...
  • Page 61 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 65-2649XLHC4SS M2A Transmitter Appendix C: Function Code 16 Registers • 61...
  • Page 62 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. 62 • Appendix C: Function Code 16 Registers 65-2649XLHC4SS M2A Transmitter...

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