RKI Instruments 65-2646RK0504SS Operator's Manual
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RKI Instruments 65-2646RK0504SS Operator's Manual

M2a transmitter
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65-2646RK0504SS
M2A Transmitter
Operator's Manual
Part Number: 71-0668
Revision: P1
Released: 2/9/24
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2646RK0504SS

  • Page 1 65-2646RK0504SS M2A Transmitter Operator’s Manual Part Number: 71-0668 Revision: P1 Released: 2/9/24 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 • 65-2646RK0504SS M2A 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 ............34 4 • 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......62 65-2646RK0504SS M2A Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2646RK0504SS M2A Transmitter. This chapter also describes the 65-2646RK0504SS 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 1: Introduction • 7...

  • Page 8: Chapter 2: Description

    3/4 NPT Conduit Hub Terminal Magnetic Strip Wand Window 3/4 NPT Conduit Hub Junction Detector Junction Box Carbon Monoxide 3/4 NPT Detector Conduit Hub Calibration Adapter/ Splash Guard Figure 1: M2A External Components 8 • Chapter 2: Description 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 9 3/4 NPT conduit hub. An O-ring seals the interface between the junction box cover and the junction box base. A locking set screw on the junction box cover allows you to secure the junction box cover and prevent it from being removed. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 2: Description • 9...
  • Page 10 The disc-shaped charcoal filter is secured to the face of the CO sensor with a rubber boot. The charcoal filter prevents interference gases (hydrogen sulfide [H S] and certain hydrocarbons) from producing false CO readings. 10 • Chapter 2: Description 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 11: Internal Description

    PCB which displays the gas reading and has the control buttons. 3/4" NPT Conduit Opening, Plugged Control PCB Terminal PCB 3/4" NPT Conduit RKI INSTRUMENTS Opening for Wire Entry M2A TRANSMITTER M2A Junction Box Figure 3: M2A Internal Components 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 2: Description • 11...
  • Page 12 4 - 20 mA output signal to another device such as a gas monitoring controller, chart recorder, or programmable controller (PLC). 12 • Chapter 2: Description 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 13 Modbus installation. See “Chapter 8: RS- 485 Modbus Output” on page 47 for a description of using the M2A in a Modbus system. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 2: Description • 13...
  • Page 14 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 • Chapter 2: Description 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 15 Since displaying the Information Screen only requires the use of one switch, the wand may be used to show the Information Screen (see “Information Screen” on page 25). 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 2: Description • 15...
  • Page 16 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. 16 • Chapter 2: Description 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 17: Chapter 3: Installation & Startup

    Mount the detector junction box with the detector facing down as shown in Figure 7. 4.59 5.00 3/4 NPT 2.41 Conduit Hub, 5.86 5.23 1.02 .30 (2X) .47 (2X) Figure 6: Outline & Mounting Dimensions, M2A Junction Box 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 17...
  • Page 18 M2A junction box. See the “Chapter 9: Parts List” on page 59 for available tubing. 18 • Chapter 3: Installation & Startup 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 19: 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 19...
  • Page 20 2 inches (for Group B environments) or 18 Detector J-Box inches (for Groups C and D environments) Carbon Monoxide Detector Calibration Adapter/Splash Guard Figure 8: Wiring the Detector to the M2A 20 • Chapter 3: Installation & Startup 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 21 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 21...
  • Page 22 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. 22 • Chapter 3: Installation & Startup 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 23: 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 41.
  • Page 24 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. 24 • Chapter 3: Installation & Startup 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 25: 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 4: Operation • 25...

  • Page 26: 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 26 • Chapter 4: Operation 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 27 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 4: Operation • 27...
  • Page 28 • 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. 28 • Chapter 4: Operation 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 29 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 23. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 4: Operation • 29...

  • Page 30: 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. (25 ppm) 30 • Chapter 5: Configuration Mode 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 31 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 5: Configuration Mode • 31...
  • Page 32 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. 32 • Chapter 5: Configuration Mode 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 33 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 5: Configuration Mode • 33...

  • Page 34: 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 65-2646RK0504SS is carbon monoxide. Gas Type Mode includes a 5-minute time-out feature. If you do not press a button for 5 minutes, the M2A automatically returns to normal operation.
  • Page 35 Use the UP/YES and DOWN/NO buttons to adjust a setting. See “Chapter 5: Configuration Mode” on page 30 for a complete description of Configuration Mode. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 6: Gas Type Mode • 35...
  • Page 36 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 36 • Chapter 6: Gas Type Mode 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 37: Chapter 7: Maintenance

    PCB and on the bottom of the terminal PCB. 3. If the power difficulties continue, contact RKI for further instruction. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 37...
  • Page 38 • 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. 38 • Chapter 7: Maintenance 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 39: 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 carbon monoxide transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months.
  • Page 40 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. 40 • Chapter 7: Maintenance 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 41: 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 41...
  • Page 42 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. 42 • Chapter 7: Maintenance 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 43 At the end of the 1 minute period, the REMOVE CAL GAS message will stop appearing and the M2A will return to normal operation. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 43...

  • Page 44: Replacing Components Of The Co Detector

    3. Unscrew the detector housing cap from the detector housing body. Make sure not to lose the cap gasket. 4. Unplug and remove the CO sensor with the rubber boot and charcoal filter attached. 5. Remove the rubber boot and charcoal filter from the old sensor. 44 • Chapter 7: Maintenance 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 45 If necessary for environmental conditions, apply thread sealant or Teflon tape to the hub and/or detector threads to seal them. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 45...
  • Page 46 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 41. 46 • Chapter 7: Maintenance 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 47: 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 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 47...
  • Page 48 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. 48 • Chapter 8: RS-485 Modbus Output 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 49 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 49...
  • Page 50 ID = 3 ID = 4 ID = 127 Up to 128 M2As can be connected without a repeater Figure 14: Multiple M2As in a Two Branch Configuration 50 • Chapter 8: RS-485 Modbus Output 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 51: 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 51...
  • Page 52 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. 52 • Chapter 8: RS-485 Modbus Output 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 53: 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 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 53...
  • Page 54 0 = Not Energized 1 = Energized Alarm 2 Relay Status 0 = Not Energized 1 = Energized Alarm 1 Relay Status 0 = Not Energized 1 = Energized 54 • Chapter 8: RS-485 Modbus Output 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 55 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 55...
  • Page 56 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. 56 • Chapter 8: RS-485 Modbus Output 65-2646RK0504SS M2A Transmitter Operator’s Manual...
  • Page 57 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. 65-2646RK0504SS M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 57...
  • Page 58 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. 58 • Chapter 8: RS-485 Modbus Output 65-2646RK0504SS M2A Transmitter Operator’s Manual...

  • Page 59: Chapter 9: Parts List

    Charcoal filter disk 45-6132RK Termination and ground jumper 65-2438 CO replacement detector assembly (includes sensor), CSA version 71-0668 65-2646RK0504SS M2A Transmitter Operator’s Manual (this docu- ment) 81-0076RK-01 Zero air calibration cylinder, 34 liter steel 81-0076RK-03 Zero air calibration cylinder, 103 liter...

  • Page 60: 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 60 • Appendix A: Control Button Quick Reference Guide 65-2646RK0504SS M2A Transmitter...

  • Page 61: 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 15: PLC and DCS Device Wiring 65-2646RK0504SS M2A Transmitter Appendix B: PLC and DCS Device Wiring • 61...

  • Page 62: 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 62 • Appendix C: Function Code 16 Registers 65-2646RK0504SS M2A Transmitter...
  • Page 63 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). 65-2646RK0504SS M2A Transmitter Appendix C: Function Code 16 Registers • 63...
  • Page 64 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 64 • Appendix C: Function Code 16 Registers 65-2646RK0504SS M2A Transmitter...
  • Page 65 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. 65-2646RK0504SS M2A Transmitter Appendix C: Function Code 16 Registers • 65...

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