RKI Instruments 65-2646RKS-SW Operator's Manual
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RKI Instruments 65-2646RKS-SW Operator's Manual

M2a transmitter
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65-2646RKS-SW
M2A Transmitter
Operator's Manual
Part Number: 71-0601
Revision: P1
Released: 8/8/22
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2646RKS-SW

  • Page 1 65-2646RKS-SW M2A Transmitter Operator’s Manual Part Number: 71-0601 Revision: P1 Released: 8/8/22 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 • 65-2646RKS-SW M2A 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 ........... 31 4 • 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers ......58 65-2646RKS-SW M2A Transmitter Operator’s Manual • 5...

  • Page 6: Chapter 1: Introduction

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

  • Page 8: Chapter 2: Description

    RKI controller. The top hub is shipped with a factory installed and sealed conduit plug to avoid leaks into the junction box. If necessary, the conduit plug can be removed and the top hub can be used for wiring. 8 • Chapter 2: Description 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 9 The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four pins to secure the sensor within the detector housing. A pre-amplifier, located between the sockets and two interconnect wires, conditions the sensor’s signal before the signal reaches the controller. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 2: Description • 9...
  • Page 10 The magnetic wand is a short plastic rod with a magnet in one end. It is used to actuate the magnetic control switches on the control PCB while the junction box cover is still installed so that non-intrusive calibration can be performed. 10 • Chapter 2: Description 65-2646RKS-SW M2A Transmitter Operator’s Manual...

  • Page 11: Internal Description

    The Modbus output may be used to connect the M2A to a Modbus network. The terminal PCB also controls three relays, one fail and two gas alarm relays. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 2: Description • 11...
  • Page 12 The Modbus terminal strip is a three position plug-in style terminal strip and is the bottom terminal strip in the left terminal column. It allows connection of the M2A into a Modbus network. 12 • Chapter 2: Description 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 13 Fail LED TX LED Magnetic Switches ENTER DOW N/NO RKI INSTRUMENTS UP/YES M2A TRANSMITTER Push Button Control Switches OLED Display UP/YES DOW N/NO ENTER Figure 5: Control PCB Component Location 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 2: Description • 13...
  • Page 14 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 23). 14 • Chapter 2: Description 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 15 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. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 2: Description • 15...

  • Page 16: Chapter 3: Installation & Startup

    5.00 3/4 NPT Conduit Port, 2.41 Plugged 3/4 NPT Conduit Port 5.86 5.23 8.6 max 3.4 max .47 (2X) .30 (2X) 1.02 Figure 6: Outline & Mounting Dimensions 16 • Chapter 3: Installation & Startup 65-2646RKS-SW M2A Transmitter Operator’s Manual...

  • Page 17: Wiring The M2A Transmitter

    The detector terminal strip and the alarm 1 relay terminal strip may be removed by grasping them with your fingers if the adjacent terminal strips have been removed. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 17...
  • Page 18 NOTE: If the M2A is being wired to a PLC or DCS device, see “Appendix B: PLC and DCS Device Wiring” on page 56, then continue with step 8. 18 • Chapter 3: Installation & Startup 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 19 You will connect the opposite end of the cable’s drain wire at the controller or device. • If the M2A will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 42. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 3: Installation & Startup • 19...

  • Page 20: Start Up

    2. Verify that all wiring connections are correct and secure. 3. Turn on the incoming power. 4. If necessary, turn on the controller or other monitoring device that is connected to the M2A. 20 • Chapter 3: Installation & Startup 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 21 “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 36.
  • Page 22 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 65-2646RKS-SW 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. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 4: Operation • 23...

  • Page 24: 4 - 20 Ma Signal Output Operation

    • Gas reading alternates with 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 24 • Chapter 4: Operation 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 25 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. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 4: Operation • 25...
  • Page 26 Responding to a Fail Condition 1. Verify that the detector wiring is correctly and securely connected. 2. Verify that the replaceable plug-in sensor in the detector housing is properly installed. 26 • Chapter 4: Operation 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 27 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. 65-2646RKS-SW 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. (25 ppm) 28 • Chapter 5: Configuration Mode 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 29 2 condition is initiated. It can be set in 1 sec- (1 secs) ond increments from 0 - 60 seconds, in 1 minute increments from 1 - 15 minutes, and in 15 minute increments from 15 - 60 minutes. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 5: Configuration Mode • 29...
  • Page 30 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. 30 • Chapter 5: Configuration Mode 65-2646RKS-SW M2A Transmitter Operator’s Manual...

  • Page 31: 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 65-2646RKS-SW 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 32 See “Chapter 5: Configuration Mode” on page 28 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. 32 • Chapter 6: Gas Type Mode 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 33 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 6: Gas Type Mode • 33...

  • Page 34: 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. 34 • Chapter 7: Maintenance 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 35 5. If the fail condition continues, signal is low enough to contact RKI for further instruction. cause a fail condition. • The detector is malfunctioning. • The terminal or display PCB is malfunctioning. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 35...

  • Page 36: 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 37 1. Connect the calibration kit sample tubing to the calibration cup hose barb. 2. Screw the calibration cup onto the detector. 3. Connect the fixed flow regulator to the calibration cup using the sample tubing. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 37...
  • Page 38 The display will indicate Leaving Cal Mode and the M2A will return to normal operation. 2. Screw the calibration gas cylinder into the fixed flow regulator. 3. Turn the regulator knob counterclockwise to open the regulator. 38 • Chapter 7: Maintenance 65-2646RKS-SW M2A Transmitter Operator’s Manual...

  • Page 39: Replacing Components Of The Co Detector

    1. Turn off or disconnect power to the M2A. 2. Unscrew the detector housing cap from the housing body. Make sure not to lose the cap gasket. See Figure 2 for an illustration of the CO detector. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 39...
  • Page 40 9. Turn on or plug in power to the M2A. CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the next step. 40 • Chapter 7: Maintenance 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 41 CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step. 15. Calibrate the replacement detector as described in “Calibration” on page 36. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 7: Maintenance • 41...

  • Page 42: 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 42 • Chapter 8: RS-485 Modbus Output 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 43 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. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 43...
  • Page 44 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. 44 • Chapter 8: RS-485 Modbus Output 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 45 ID = 3 ID = 4 ID = 127 Up to 128 M2As can be connected without a repeater Figure 13: Multiple M2As in a Two Branch Configuration 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 45...

  • Page 46: 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. 46 • Chapter 8: RS-485 Modbus Output 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 47 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. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 47...

  • Page 48: 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 48 • Chapter 8: RS-485 Modbus Output 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 49 0 = Not Energized 1 = Energized Alarm 1 Relay Status 0 = Not Energized 1 = Energized Register 3 Register 3 is the supply voltage (0.1 volt per count). 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 49...
  • Page 50 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 50 • Chapter 8: RS-485 Modbus Output 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 51 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. 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 51...
  • Page 52 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 52 • Chapter 8: RS-485 Modbus Output 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 53 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 65-2646RKS-SW M2A Transmitter Operator’s Manual Chapter 8: RS-485 Modbus Output • 53...

  • Page 54: Chapter 9: Parts List

    M2A junction box with foam pad, label, and conduit plug 33-7101RK Charcoal filter disk 45-6132RK Termination and ground jumper 71-0601 65-2646RKS-SW 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 55: Appendix A: Control Button Quick Reference Guide

    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 65-2646RKS-SW M2A Transmitter Operator’s Manual Appendix A: Control Button Quick Refer-...

  • Page 56: Appendix B: Plc And Dcs Device Wiring

    • If the M2A will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 42. 56 • Appendix B: PLC and DCS Device 65-2646RKS-SW M2A Transmitter Operator’s Manual...
  • Page 57 (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 65-2646RKS-SW M2A Transmitter Appendix B: PLC and DCS Device Wiring • 57...

  • Page 58: Appendix C: Function Code 16 Registers

    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 Register 9 Register 9 is the alarm 2 relay state. 0=Normally De-Energized 1=Normally Energized 58 • Appendix C: Function Code 16 Registers 65-2646RKS-SW M2A Transmitter...
  • Page 59 Register 16 is explained in Supported Modbus Functions in the M2A 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. 65-2646RKS-SW M2A Transmitter Appendix C: Function Code 16 Registers • 59...
  • Page 60 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 60 • Appendix C: Function Code 16 Registers 65-2646RKS-SW M2A Transmitter...

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