RKI Instruments 65-2641RK-04 Operator's Manual
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RKI Instruments 65-2641RK-04 Operator's Manual

M2a transmitter
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65-2641RK-04
M2A Transmitter
Operator's Manual
Part Number: 71-0331
Revision: F
Released: 8/28/20
RKI Instruments, Inc.
www.rkiinstruments.com

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  • Page 1 65-2641RK-04 M2A Transmitter Operator’s Manual Part Number: 71-0331 Revision: F Released: 8/28/20 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 3 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. This warranty does not apply to those items which by their nature are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced on a routine basis.

  • Page 4: Table Of Contents

    Selecting the Gas Type ........... 30 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 5 Appendix C: Function Code 16 Registers......... 54 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2641RK-04 M2A Transmitter. This chapter also describes the 65-2641RK- 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

    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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 8: Chapter 2: Description

    Mounting Slot (2x) Hub, Plugged Terminal Strip Magnetic W and W indow 3/4 NPT Conduit Hub Junction Detector Junction Box 3/4 NPT Conduit Hub Hydrogen Detector Calibration Adapter/ Splash Guard Figure 1: M2A External Components 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 9 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 10: Internal Description

    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. A factory adjust pot just above the programming connector is used to set the detector current. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 11 They are three-position plug-in style terminal strips. The relay terminal strips are used to connect devices such as lights and horns that are controlled by the relay contacts. The relay contacts are rated at 115 VAC, 5 amps. The relay contacts may also be used to control higher rated relays. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 12 The push button switches are located along the bottom edge of the control PCB (see Figure 4). The UP/YES button is on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 13 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 14: Chapter 3: Installation & Startup

    Mount the detector junction box with the detector facing down as shown in Figure 6. 4.59 5.00 3/4 NPT 2.41 Conduit Hub 5.86 5.23 1.02 .30 (2X) .47 (2X) Figure 5: Outline & Mounting Dimensions, M2A Junction Box 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 15 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 “Chapter 9: Parts List” on page 50 for available tubing. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 16: 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 17 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 18 • If the M2A will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 40. See Figure 8 below for field wiring connections to the M2A. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 19 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 20: 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 36. 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 21 Press and release the ENTER button. The M2A will perform a zero operation and the display will indicate SPAN w/Cal Gas?. Press and release the DOWN/NO button. The display will indicate Leaving CAL Mode and the M2A will return to normal operation. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 22: Chapter 4: Operation

    M2A. 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 23: 4 - 20 Ma Signal Output Operation

    F LED is on detector wiring • FAIL message replaces gas • Display reading at -10% of full scale reading or lower NOTE: There is a 30 second • Defective components delay on the fail condition. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 24 When the gas reading reaches the alarm 2 setpoint, the M2A senses an alarm 2 condition. The M2A alerts you to an alarm 2 condition as follows: • The A2 LED turns on. • The gas reading alternates with the ALARM-2 message. • The alarm 2 relay energizes. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 25 The message LowPower is indicated on the top line of the OLED display and the input voltage is displayed on the bottom line of the OLED display. • The fail relay de-energizes. NOTE: The low power alarm cannot be cleared using the ENTER button. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 26 When the input power increases above 10.0 volts, the M2A will begin its warm-up sequence. 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 20. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 27: Chapter 5: Configuration Mode

    The gas reading at which the M2A initiates an alarm 1 condition. (10% LEL) ALARM-1 (activation) Indicates if the alarm 1 circuit is activated by gas readings increasing (Increase) (Increase) or decreasing (Decrease) to the ALARM-1 Level. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 28 SELF-RST. 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 29 M2A will return to the first adjustable parameter. Go back to step 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 30: Chapter 6: Gas Type Mode

    Choices 0 - 100% LEL iBUTANE 0 - 100% LEL PROPANE 0 - 100% LEL HEXANE 0 - 100% LEL HYDROGEN 0 - 100% LEL METHANE 0 - 100% Volume METHANE 0 - 100% LEL 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 31 10. Press and release the UP/YES button to enter Calibration Mode. Normally, you must hold the UP/YES button for 5 seconds to enter Calibration Mode, but since a calibration is required, only a momentary push is needed to enter Calibration Mode after changing the gas type. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 32 Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 33: 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 34 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 35: Calibration Frequency

    3 to 6 months is adequate for most hydrogen transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months. If an application is not very demanding, for example detection in a clean, temperature controlled environment where hydrogen is not normally present and calibration adjustments are minimal at calibration, then a calibration frequency of every 6 months is adequate.

  • Page 36: 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 37 If you want to skip adjusting the span reading, press and release the DOWN/NO button. The display will indicate Leaving Cal Mode and the M2A will return to normal operation. Screw the calibration gas cylinder into the fixed flow regulator. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 38: Replacing The Hydrogen Detector

    Connect the detector leads to the terminal block the same way the old detector was wired (see Figure 7 on page 17). Screw the calibration adapter/splash guard onto the new detector. Reinstall the detector junction box cover. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 39 10. Turn on or plug in power to the M2A. 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 36. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 40: Chapter 8: Rs-485 Modbus Output

    M2A isn’t wired into a Modbus system or if it is wired into one as shown in Figure 10, the ground jumper should be installed. If the M2A is wired in a Modbus system as shown in Figure 9, the ground jumper should be removed. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 41 Modbus controller is connected to the “-” of the 24 VDC power supply. The ground jumper must be installed in this wiring configuration. Power Supply 10-30 VDC Detector Detector Additional Wiring Wiring M2As Common Input Terminals Modbus Controller Figure 10: Alternate Modbus Wiring 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 42 Not Installed Not Installed ID = 2 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 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 43: 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 44 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 45: 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 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 46 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. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 47 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. Register 32 Register 32 is the alarm 2 OFF delay. Integer values are in seconds. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 48 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 Register 40 Register 40 is the remote configuration register access level 0=None 1=Alarm Reset 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 49 Table 12: Register 16, Button Function 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 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 50: Chapter 9: Parts List

    M2A junction box with foam pad, label, and conduit plug 45-6132RK Termination and ground jumper 71-0331 65-2641RK-04 M2A Transmitter Operator’s Manual (this document) 81-0002RK-01 Calibration cylinder, 50% LEL hydrogen in air, 34 liter steel 81-0002RK-03 Calibration cylinder, 50% LEL hydrogen in air, 103 liter...

  • Page 51: 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 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 52: 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 40. 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 53 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 13: PLC and DCS Device Wiring 65-2641RK-04 M2A Transmitter Operator’s Manual...

  • Page 54: Appendix C: Function Code 16 Registers

    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 Register 10 Register 10 is the alarm 2 relay reset. 0=Latching 1=Self-Resetting 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 55 [15:2] Unused Write “1” to this bit to clear “Gas Type Changed” flag Write “1” to this bit to clear “Configuration Changed” flag Register 20 Register 20 is the AutoZero Disable. 0=AutoZero Enabled 1=AutoZero Disabled 65-2641RK-04 M2A Transmitter Operator’s Manual...
  • Page 56 Register 21 Register 21 is the Remote Configuration Register. 0=No Remote Configuration 1=Reset Alarm 65-2641RK-04 M2A Transmitter Operator’s Manual...

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