RKI Instruments 65-2643XL-05-04 Operator's Manual
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RKI Instruments 65-2643XL-05-04 Operator's Manual

M2a-xl transmitter
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65-2643XL-05-04
M2A-XL Transmitter
Operator's Manual
Part Number: 71-0645
Revision: P1
Released: 11/16/23
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2643XL-05-04

  • Page 1 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Part Number: 71-0645 Revision: P1 Released: 11/16/23 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 For most applications, typical calibration frequencies are between 3 and 6 months but can be more often or less often based on your usage. 2 • 65-2643XL-05-04 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 ............33 4 • 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......61 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2643XL-05-04 M2A-XL Transmitter. This chapter also describes the 65-2643XL-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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Specifications • 7...

  • Page 8: Chapter 2: Description

    3/4 NPT Conduit Hub Terminal Mounting Hole (2x) Strip Window Magnetic Wand 3/4 NPT Conduit Hub M2A-XL Junction Box Detector Junction Box Oxygen Detector Calibration Adapter/ Splash Guard Figure 1: M2A-XL External Components 8 • Overview 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 9 A ground boss near the top conduit hub provides an external earth ground connection. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual External Description • 9...
  • Page 10 The sensor is secured within the detector assembly by the housing cap. Through a series of chemical and electrical reactions, the sensor produces an electrical output that corresponds to the detection range of the transmitter. 10 • External Description 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 11: Internal Description

    3/4 NPT Conduit Opening, Plugged Control PCB Terminal PCB RK I INSTRU MENTS 3/4 NPT Conduit Opening for Wire Entry M2A-XL T RANSMITTER M2A-XL Junction Box Figure 3: M2A-XL Internal Components 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Internal Description • 11...
  • Page 12 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). 12 • Internal Description 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 13 Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 45 for a description of using the M2A-XL in a Modbus system. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Internal Description • 13...
  • Page 14 The push button switches are located along the bottom edge of the control PCB (see Figure 5). The UP/YES button is on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right. 14 • Internal Description 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 15 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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Internal Description • 15...

  • Page 16: Chapter 3: Installation & Startup

    Mount the detector junction box with the detector facing down as shown in Figure 7. 3/4 NPT 4.86 5.66 Conduit Port, 2.82 3/4 NPT Plugged Conduit Port Ø 0.25, 2X 1.00 Figure 6: Outline & Mounting Dimensions, M2A-XL Junction Box 16 • Overview 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 17 M2A-XL junction box. See the “Chapter 9: Parts List” on page 57 for available tubing. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Mounting the M2A-XL Transmitter • 17...

  • Page 18: 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. 18 • Wiring the M2A-XL Transmitter 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 19 Oxygen Detector inches (for Groups C and D environments) Calibration Adapter/Splash Guard Figure 8: Wiring the Detector to the M2A-XL 15. Reinstall the detector terminal strip into its socket. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Wiring the M2A-XL Transmitter • 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 • Wiring the M2A-XL Transmitter 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 21 6. 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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Wiring the M2A-XL Transmitter • 21...

  • Page 22: 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. 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 23 4. Press and release the ENTER button. The M2A-XL will perform a span operation and then the display will indicate ZERO 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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Start Up • 23...

  • Page 24: 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. 24 • Overview 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 25: 4 - 20 Ma Signal Output Operation

    ALARM-1 message Alarm 2 Increasing gas reading at or above the • A2 LED is on alarm 2 setpoint • Gas reading alternates with ALARM-2 message 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual 4 - 20 mA Signal Output Operation • 25...
  • Page 26 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. 26 • Alarm Indications 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 27 • 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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Alarm Indications • 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 22. 28 • Alarm Indications 65-2643XL-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- (19.5%) tion. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Overview • 29...
  • Page 30 (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 • Viewing & Changing M2A-XL Parameters 65-2643XL-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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Viewing & Changing M2A-XL Parameters • 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 • Viewing & Changing M2A-XL Parameters 65-2643XL-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 65-2643XL-05-04 is oxygen. 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 Use the UP/YES and DOWN/NO buttons to adjust a setting. See “Chapter 5: Configuration Mode” on page 29 for a complete description of Configuration Mode. 34 • Selecting the Gas Type 65-2643XL-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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Selecting the Gas Type • 35...

  • Page 36: 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. 36 • Overview 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 37 5. If the fail condition continues, air signal is low contact RKI for further enough to cause a instruction. fail condition. • The detector is malfunctioning. • The terminal or display PCB is malfunctioning. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Troubleshooting • 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 oxygen 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 fresh air adjustment or zero adjustment, gas must be applied for this length of time. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Determining Response Time • 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 • Calibration 65-2643XL-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 maximum gas response on the display and retain the response level in its memory. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Calibration • 41...
  • Page 42 At the end of the 1 minute period, the REMOVE CAL GAS message will stop appearing and the M2A-XL will return to normal operation. 42 • Calibration 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 43: Replacing Components Of The Oxygen Detector

    4. Disconnect the detector leads from the terminal block in the detector junction box. Note the position of the color-coded leads as you remove them. 5. Unscrew the detector from the detector junction box. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Replacing Components of the Oxygen Detector • 43...
  • Page 44 CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step. 11. Calibrate the replacement detector as described in “Calibration” on page 40. 44 • Replacing Components of the Oxygen Detector 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

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

    The MODBUS terminal strip is located on the terminal PCB (see Figure 4 on page 12). 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 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Overview • 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 be removed. 46 • Wiring the M2A-XL in a Modbus System 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 47 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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Wiring the M2A-XL in a Modbus System • 47...
  • Page 48 ID = 3 ID = 4 ID = 127 Up to 128 M2As can be connected without a repeater Figure 13: Multiple M2A-XLs in a Two Branch Configuration 48 • Wiring the M2A-XL in a Modbus System 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 49: Using The M2A-Xl In A 4-Wire Modbus System

    Table 9 lists the M2A-XL Modbus Mode parameters you can set. Table 9 also lists the factory set value for each parameter. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Using the M2A-XL in a 4-wire Modbus System • 49...
  • Page 50 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. 50 • Modbus Mode 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 51: 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 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 51...
  • Page 52 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 52 • Supported Modbus Functions 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 53 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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 53...
  • Page 54 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 54 • Supported Modbus Functions 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 55 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. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 55...
  • Page 56 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. 56 • Supported Modbus Functions 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 57: Chapter 9: Parts List

    Termination and ground jumper 65-1025RK Plug-in oxygen sensor 65-2514RK Oxygen detector 71-0645 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual (this document) 81-0076RK-01 Zero air calibration cylinder, 34 liter steel 81-0076RK-03 Zero air calibration cylinder, 103 liter 81-0078RK-01 Calibration cylinder, 100% nitrogen, 34 liter steel (used for setting oxygen...

  • Page 58: Appendix A: Control Button Quick Reference Guide

    DOWN/NO for 5 seconds Modbus Mode Press and Hold • Enable or Disable Modbus DOWN/NO and • Slave ID ENTER for 5 • Baud Rate seconds • Parity • Response Delay 58 • Supported Modbus Functions 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 59: 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 45. 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 59...
  • Page 60 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 14: PLC and DCS Device Wiring 60 • Supported Modbus Functions 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

  • Page 61: 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 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 61...
  • Page 62 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). 62 • Supported Modbus Functions 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...
  • Page 63 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 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Supported Modbus Functions • 63...
  • Page 64 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. 64 • Supported Modbus Functions 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual...

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