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RKI Instruments 65-2670-XX-04 Operator's Manual

M2a transmitter
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65-2670-XX-04
M2A Transmitter
Operator's Manual
Part Number: 71-0518
Revision: D
Released: 6/24/21
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2670-XX-04

  • Page 1 65-2670-XX-04 M2A Transmitter Operator’s Manual Part Number: 71-0518 Revision: D Released: 6/24/21 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 Frequency of calibration depends upon the type of use you have and the sensor types. Typical calibration frequencies for most applications are between 3 and 6 months, but can be required more often or less often based on your usage. 65-2670-XX-04 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 ..........32 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers........60 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2670-XX-04 M2A Transmitter. This chapter also describes the 65-2670-XX-04 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

    ± 10% of reading or ± 5% of full scale (whichever is greater) These are the RKI factory settings. You can change the alarm settings in Configuration Mode. See “Viewing & Changing M2A Parameters” on page 29. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 8 When using the M2A, you must follow the instructions and warnings in this manual to assure proper and safe operation of the M2A and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the M2A as described in this manual. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 9: Chapter 2: Description

    Mounting Slot (2x) 3/4 NPT Conduit Hub Terminal Strip Magnetic Wand Window 3/4 NPT Conduit Hub Detector Junction Box Junction Box Detector 3/4 NPT Calibration Adapter/ Conduit Hub Splash Guard Figure 1: M2A External Components 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 10 , 0 - 10 ppm 65-2670-CL210-4 65-2302-CL2-10 , 0 - 1 ppm 65-2670-CLO2-04 65-2302-CLO2 , 0 - 3 ppm 65-2670-CLO2-34 65-2302-CLO2-3 , 0 - 100 ppm 65-2670-NH3-1-4 65-2302-NH3-100 , 0 - 500 ppm 65-2670-NH3-5-4 65-2302-NH3-500 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 11 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 12: Internal Description

    PCB is used to connect the terminal PCB to the control PCB with a ribbon cable. A 5 position connector on the left side of the terminal PCB is used by factory or field service personnel to program the M2A. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 13 The relay contacts are rated at 115 VAC, 5 amps. The relay contacts may also be used to control higher rated relays. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • 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. 65-2670-XX-04 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 16: Chapter 3: Installation & Startup

    Figure 7 shows the outline and mounting dimensions for the detector junction box. 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: M2A Junction Box Dimensions 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 17 Teflon tubing to an accessible area that is close to the M2A junction box. Use the flexible tubing on the other end to connect to a regulator during calibration. See the “Chapter 9: Parts List” on page 55 for available tubing. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 18: 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 19 Table Detector J-Box Gas Type Table Gas Type + W ire yellow Detector CLO2 violet Calibration Adapter/Splash Guard Figure 8: Wiring the Detector to the M2A 14. Reinstall the detector terminal strip into its socket. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 20 • If the M2A will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 44. See Figure 9 below for field wiring connections to the M2A. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 21: Start Up

    Verify that the display is indicating the target gas and current gas reading after the warm-up period is complete and normal operation begins. 0 ppm 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 22 “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 38. Verify that the M2A 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 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 24: Chapter 4: Operation

    This information may be useful if you need to contact the factory with questions about the 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 25: 4 - 20 Ma Signal Output Operation

    During the 30 second delay, the signal output follows the detector output. In the case of a downscale reading, the display and the signal output continue to track the reading down to -99% of full scale (1.15 mA). 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 26: Alarm Indications

    When the gas reading reaches the alarm 1 setpoint, the M2A senses an alarm 1 condition. The M2A alerts you to an alarm 1 condition as follows: • The A1 LED turns on. • The gas reading alternates with the ALARM-1 message. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 27 The M2A indicates a fail condition for any of the following: • The detector wiring is disconnected or incorrectly connected. • The plug-in sensor is not properly plugged into the socket in the detector housing body. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 28 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 22. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 29: Chapter 5: Configuration Mode

    If the currently displayed parameter is OK, press the ENTER button to proceed to the next parameter. Table 5 lists the M2A parameters you can set. Table 5 also lists the factory set value for each parameter. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 30 2 condition is initiated. It can be set in 1 second increments from 0 - 60 seconds, in 1 minute increments from 1 - 15 minutes, and in 15 minute increments from 15 - 60 minutes. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 31 3 and continue. 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 32: Chapter 6: Gas Type Mode

    Table 6: Gas Types Gas Type Detection Range Choices 0 - 100 ppm 0 - 300 ppm 0 - 200 ppm 0 - 100 ppm 0 - 3.00 ppm 0 - 10.0 ppm 0 - 75.0 ppm 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 33 DO OVER? YES/NO. Press the UP/YES button and the display will indicate Re-do 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 34 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 35: Chapter 7: Maintenance

    PCB is securely installed. 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 36 The detector fresh air 5. If the fail condition continues, signal is low enough contact RKI for further instruction. to cause a fail condition. • The detector is malfunctioning. • The terminal or display PCB is malfunctioning. 65-2670-XX-04 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 3 to 6 months is adequate for most transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months.

  • Page 38: Calibration

    RKI Instruments, Inc. recommends using a ClO generator to set the ClO detector’s response reading. The flow rate on the generator needs to be set to 0.5 LPM and RKI Instruments, Inc. recommends that 0.5 ppm ClO be used. If a ClO generator is used for calibration, the steps related to the use of a calibration gas cylinder in the instructions below can be disregarded.
  • 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 will indicate Leaving CAL Mode and the M2A will return to normal operation. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 40 Using the 0.5 LPM regulator that is normally recommended for M2As will result in an inaccurate calibration. 4. Allow calibration gas to flow for the length of time determined in “Determining Response Time” on page 37. 5. Turn the regulator knob clockwise to close it. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 41: Replacing Components Of The 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 42 7. Plug the sensor back into the four-socket pattern in the detector housing body. 8. Make sure the cap gasket is in place and screw the detector housing cap back onto the detector housing body. 9. Turn on or reconnect power to the M2A. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 43 For ClO : Allow the replacement detector to warm up for 2-3 hours before you continue with the next step. 11. Calibrate the replacement detector as described in “Calibration” on page 38. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 44: Chapter 8: Rs-485 Modbus Output

    The MODBUS terminal strip is located on the terminal PCB (see Figure 4 on page 13). 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 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 45 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 46 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 47 Not Installed Not Installed Not Installed ID = 2 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 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 48: 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 49 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. 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 50: Supported Modbus Functions

    5 = Calibration 6 = Post-Calibration 7 = Low Power 8 = Setup [11] Gas Type Change 0=Not Changed 1=Changed [10] Configuration Change 0=Not Changed 1=Changed Calibration Activity Flag 0=No Calibration Activity 1=Calibration Activity Has Occurred 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 51 Register 13 is the alarm 1 set point. The decimal point location is the same as specified in Register 1. Register 14 Register 14 is the alarm 2 set point. The decimal point location is the same as specified in Register 1. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 52 Register 29 is the alarm 2 normal relay state. 0=Normally De-Energized 1=Normally Energized Register 30 Register 30 is the alarm 2 relay reset. 0=Latching 1=Self-Resetting Register 31 Register 31 is the alarm 2 ON delay. Integer values are in seconds. 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 53 8=Calculated Zero Is Too High 9=Zero Failure 10=Span Failure 11=Calibration Is Overscale 12=LEL Sensor Offset Is Too High 13=LEL Null Operation Failed 14=Operation Not Performed Register 39 Register 39 is the auto-zero disable. 0=AutoZero Enabled 1=AutoZero Disabled 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 54 Register 40 in Function Code 03, the remote configuration register, must be set to 1 in order for Register 16 to work. Table 12: Register 16, Button Function Value & Field ENTER (used for “Alarm Reset”) 0=Not Pressed 1=Pressed 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 55: Chapter 9: Parts List

    CT-7 Series detector, 0 - 200 ppm ammonia (includes sensor) 65-2302-NH3-5 CT-7 Series detector, 0 - 500 ppm ammonia (includes sensor) 71-0518 65-2670-XX-04 M2A Transmitter Operator’s Manual (this document) 81-0076RK-01 Zero air calibration cylinder, 34 liter steel 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 56 Regulator, fixed flow, 0.25 LPM, with gauge and knob, for 34 liter aluminum, 58 liter, and 103 liter cylinders (cylinders with internal threads) 81-1116RK Calibration adapter/splash guard 81-9029RK-02 Calibration cylinder, 100 ppm NH in nitrogen, 58 liter 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 57: Appendix A: Control Button Quick Reference Guide

    Gas Type UP/YES and 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 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 58: Appendix B: Plc And Dcs Device Wiring

    M2A. 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 44. 65-2670-XX-04 M2A 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 15: PLC and DCS Device Wiring 65-2670-XX-04 M2A Transmitter Operator’s Manual...

  • Page 60: 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 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 61 This register can be used to clear those flags. Table 16: Register 19, Clear Change Flags Bit(s) Value & Field [15:2] Unused Write “1” to this bit to clear “Gas Type Changed” flag Write “1” to this bit to clear “Configuration Changed” flag 65-2670-XX-04 M2A Transmitter Operator’s Manual...
  • Page 62 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 65-2670-XX-04 M2A Transmitter Operator’s Manual...

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