RKI Instruments M2 Operator's Manual
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RKI Instruments M2 Operator's Manual

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65-2610RK-04
M2 Transmitter
Operator's Manual
Part Number: 71-0294RK
Revision: 0
Released: 12/27/13
GlobalTestSupply
www.
.com
Find Quality Products Online at:
sales@GlobalTestSupply.com

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Summary of Contents for RKI Instruments M2

  • Page 1 65-2610RK-04 M2 Transmitter Operator’s Manual Part Number: 71-0294RK Revision: 0 Released: 12/27/13 GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.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. 65-2610RK-04 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • 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

    Viewing & Changing M2 Parameters ........
  • Page 5 Using the M2 in a 4-wire Modbus System ....... . .

  • Page 6: Chapter 1: Introduction

    The M2 displays the current gas reading on an LCD display which is visible through the window in the cover (front face) and provides a 4 - 20 mA signal which indicates the target gas reading for use by a gas monitoring controller, recording device, or programmable controller.

  • Page 7: Specifications

    WARNING: When using the M2, you must follow the instructions and warnings in this manual to assure proper and safe operation of the M2 and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the M2 as described in this manual.

  • Page 8: Chapter 2: Description

    Chapter 2: Description Overview This chapter describes the components of the M2 transmitter. The transmitter is a 4 - 20 mA type detector head. It consists of the combustible gas detector, calibration adapter/ splash guard, terminal PCB, the M2 junction box, and the detector junction box. The two junction box configuration is intended for situations where the detector needs to be installed at an inaccessible location.
  • Page 9 Use the bottom 3/4” conduit hub to wire the remotely installed combustible gas detector. Use the junction box’s two mounting slots to mount the M2 to a vertical surface at the monitoring site. The window in the cover on the front of the junction box allows you to view the LCD display and use the magnetic wand to actuate the magnetic control switches so you can perform non-intrusive calibration.

  • Page 10: Internal Description

    This section describes the internal components of the M2. The internal components of the M2 include the terminal PCB which provides for all the wiring connections to the M2 and the control PCB which displays the gas reading and has the control buttons.
  • Page 11 The power/signal terminal strip is a three position plug-in style terminal strip located at the top of the left terminal column. It is used to connect 24 VDC power to the M2 and to connect the 4 - 20 mA output signal to a device.
  • Page 12 A two pin header with a termination jumper installed is located below the Modbus terminal strip. The jumper has no function unless the M2 is wired into a Modbus installation. See “Chapter 8: RS-485 Modbus Output” on page 36 for a description of using the M2 in a Modbus system.
  • Page 13 The M2 includes five status LEDs that are located above the display (see Figure 2). • Fail LED The fail LED turns on when the M2 is experiencing a fail condition. A fail condition can be caused by a detector failure or low detector signal. •...

  • Page 14: Chapter 3: Installation & Startup

    • For the M2 junction box, select a site where the junction box is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures. The site should be easily accessible.
  • 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 M2 junction box. See the “Parts List” on page 46 for available tubing. 65-2610RK-04 M2 Transmitter Operator’s Manual GlobalTestSupply www.

  • Page 16: Wiring The M2 Transmitter

    Wiring the M2 Transmitter WARNING: Always verify that the power to the M2 is off before you make wiring connections. Confirm that no power is being applied to the M2. Remove the detector junction box’s cover from the junction box.
  • Page 17 13. Reinstall the detector terminal strip into its socket. 14. If shielded cable is used between the detector junction box and the M2 junction box, connect the cable’s drain wire to an available chassis (earth) ground at the M2 junction box.
  • Page 18 Modbus output is used. NOTE: If the M2 is being wired to a PLC or DCS device, see “Appendix B: PLC and DCS Device Wiring” on page 48, then continue with step 8.

  • Page 19: Start Up

    If necessary, turn on the controller or other monitoring device that is connected to the The LCD display will indicate the firmware version when the M2 is first powered up and will then count down a one minute warm-up period before normal operation begins.
  • Page 20 To actuate a magnetic switch and perform the same operation as pressing a control switch button, touch the magnet in the end of the magnetic wand to the M2’s glass cover directly over the magnetic switch you wish to actuate. Touching the glass and removing the wand is the same as pressing and releasing a button.
  • Page 21 Press and release the ENTER button. The M2 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 M2 will return to normal operation.

  • Page 22: Chapter 4: Operation

    Chapter 4: Operation Overview This chapter describes the M2 in normal operation. This chapter also describes the M2 in alarm 1, alarm 2, and fail conditions and suggests responses to these conditions. Normal Operation Normal operation is defined as follows: •...

  • Page 23: 4 - 20 Ma Signal Output Operation

    • When the M2 is in its warm-up period, the signal output will be fixed at 3.5 mA (zero). • When the M2’s gas type is changed, the M2 will enter Configuration Mode for you to verify the parameter settings.
  • Page 24 • LowPower message and actual voltage of incoming DC power If the M2 is in both an alarm 1 and an alarm 2 condition, both alarm LEDs are on and the display alternates between the gas reading and the ALMS 1&2 message. NOTE: You can select normally energized (N.
  • Page 25 NOTE: If the M2 is in both an alarm 1 and alarm 2 condition, both the A1 and A2 LEDs will be on, the gas reading will alternate with the ALMS 1&2 message, and both alarm relays will energize. Responding to an Alarm 2 Condition Follow your established procedure for a high level combustible gas condition.
  • Page 26 NOTE: The low power alarm cannot be cleared using the ENTER button. When the voltage increases to 19.0 volts, the low power alarm is cleared and the M2 will begin its warm-up sequence. Responding to a Low Power Condition Determine and correct the cause of the low power condition.

  • Page 27: 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 M2 parameters you can set. Table 5 also lists the factory set value for each parameter. 65-2610RK-04 M2 Transmitter Operator’s Manual GlobalTestSupply www.
  • Page 28 15 minute increments from 15 - 60 minutes. A1 OffDy (alarm 1 off delay) The amount of time the M2 delays turning off the alarm 1 circuit once an (0 sec.) alarm 1 condition passes. This parameter appears only if the alarm 1 relay reset setting is set to SELF-RST.
  • Page 29 If you wish to change some of the adjustments made, press and release the DOWN/ NO button. The DO OVER? YES/NO message will display. Press and release the UP/ YES button. The Re-do Config message will display and the M2 will return to the first adjustable parameter. Go back to step 3 and continue.

  • Page 30: Chapter 6: Gas Type Mode

    Chapter 6: Gas Type Mode Overview This chapter describes how to use Gas Type Mode to select the M2’s gas type. The gas type determines the target gas and detection range. CAUTION: The target gas is factory set and does not normally need to be changed. The standard setting for the 65-2610RK-04 is methane, but it may be different depending on the calibration.
  • Page 31 Gas Type Updated, the display will indicate the target gas and the detection range for a few seconds, and then the M2 will enter Configuration Mode automatically so that the parameter settings in Configuration Mode can be verified or changed.
  • Page 32 NOTE: When calibrating an M2 after changing the gas type, the M2 will not ask if you want to calibrate, or whether you want to perform a fresh air adjustment, span adjustment or zero adjustment. Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations.

  • Page 33: Chapter 7: Maintenance

    Response Time” on page 31. Verify that the display reading is within ± 20% of the gas concentration. NOTE: If the reading is not within ± 20% of the gas concentration, calibrate the M2 as described in “Calibration” on page 32.

  • Page 34: Troubleshooting

    The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the M2. NOTE: This troubleshooting guide describes M2 problems only. If the M2 is connected to a controller, see the controller operator’s manual for problems you may encounter with the controller.
  • Page 35 Condition Symptom(s) Probable Causes Recommended Action Flickering The display reading • The M2 is 1. Verify that the M2 wiring is experiencing false properly shielded. See “Wiring Display flickers often. readings due to RFI the M2 Transmitter” on page 11.

  • Page 36: Calibration Frequency

    3 months will be necessary. Determining Response Time Since the detector junction box is installed remotely from the M2, the response time of the detector will depend on the length of flexible tubing that is attached to the calibration adapter/splash guard.

  • Page 37: Calibration

    To actuate a magnetic switch and perform the same operation as pressing a control switch button, touch the magnet in the end of the magnetic wand to the M2’s glass cover directly above the magnetic switch you wish to actuate. Touching the glass and removing the wand is the same as pressing and releasing a button.
  • Page 38 10. Press and release the ENTER button. The M2 will perform a fresh air adjustment and the display will indicate SPAN w/Cal Gas?.

  • Page 39: Replacing The Combustible Gas Detector

    UP/YES and DOWN/NO buttons, then press and release the ENTER button. The M2 will perform a span operation. The display will indicate SPAN Gas PASS for a few seconds, then indicate SPAN Gas SAVED before indicating Leaving CAL Mode for a few seconds.
  • Page 40 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 32. 65-2610RK-04 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...

  • Page 41: Chapter 8: Rs-485 Modbus Output

    The Modbus protocol supports a maximum of 247 unique slave addresses (1-247). The M2’s line driver provides for up to 128 M2s to be connected together without the need for a repeater. Figure 10 & Figure 11 below illustrate typical M2 wiring configurations. If more than 128 M2s need to be connected together, RS-485 repeater(s) should be used such that no more than 128 M2s reside on any given network segment.
  • Page 42 Figure 8: Recommended Modbus Wiring Alternate Modbus Wiring For Existing Installations Although the wiring shown in Figure 8 is recommended, it is possible to wire the M2 into a Modbus system with only 4 wires in situations where a pre-existing system is being replaced and wiring is already in place.
  • Page 43 When the M2 is installed in a Modbus system, this jumper must be installed in an M2 that is at the end of a Modbus line. Any M2 in a Modbus system that is not at the end of a line must have the termination jumper removed (see Figure 10 &...

  • Page 44: Using The M2 In A 4-Wire Modbus System

    Using the M2 in a 4-wire Modbus System Although the M2 is a 2-wire Modbus RTU device, it can be used with a 4-wire Modbus controller if the system wiring is modified as follows: • Connect the controller’s TxD0 and RxD0 wires together and use this connection as the 2-wire Modbus D0 signal.
  • Page 45 All M2s on a Modbus network must be configured with the same baud rate and parity, and each M2 must have a unique slave ID. For an M2 to participate on a network, the ENABLED/DISABLED setting must be set to ENABLE.

  • Page 46: Supported Modbus Functions

    The M2 supports Function Code 03: Read Holding Registers and Function Code 16: Write Registers. The register assignments detailed below were implemented in M2 firmware version 5.0. Please see revision B of the M2 manual if you have an M2 with a firmware version previous to 5.0.
  • Page 47 Register 3 is the supply voltage (0.1 volt per count). Registers 4 - 11 The 16 bytes in these registers contain the same ASCII text information that is displayed on the M2’s LCD (not NULL Terminated). 65-2610RK-04 M2 Transmitter Operator’s Manual GlobalTestSupply www.
  • Page 48 Register 28 Register 28 is the alarm 2 trigger. 0=Decreasing 1=Increasing Register 29 Register 29 is the alarm 2 normal relay state. 0=Normally De-Energized 1=Normally Energized 65-2610RK-04 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 49 7=Calculated Zero Is Too Low 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 65-2610RK-04 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 50 Function Code 16: Write Registers There are 21 registers in Function Code 16 that can be used to write to the M2. This manual only describes Register 16 because it can be used to reset an alarm condition. For a complete description of Function Code 16, request Appendix C from RKI Instruments, Inc.

  • Page 51: Parts List

    Parts List Table 13 lists replacement parts and accessories for the M2 Transmitter. Table 13: Parts List Part Number Description 06-1248RK Calibration kit sample tubing (3/16 in. x 5/16 in.; specify length when ordering) 07-0203RK Rubber retaining boot for charcoal filter...

  • Page 52: Appendix A: Control Button Quick Reference Guide

    Appendix A: Control Button Quick Reference Guide The M2’s control buttons allow access to operational modes, resetting of alarms, and display of the Information Screen. Table 14 shows which button combinations perform these functions and which parameters are available for adjustment while in the operational modes.

  • Page 53: Appendix B: Plc And Dcs Device Wiring

    If the PWR/SIG terminal strip connections and one or more relays are used, route the connections to the M2 in conduit. Use shielded cable in the conduit for the PWR/SIG connections and unshielded cable or individual wires for the relay connections.
  • Page 54 See Figure 12 below for field wiring connections to the M2. 24 VDC Power Supply 24 VDC + Alarm Device 24 VDC - Power Fail Alarm 4 - 20 mA In (S) Device (24 VDC) - Alarm 1 Alarm Device...

  • Page 55: Appendix C: Function Code 16 Registers

    The M2 supports Function Code 16 that allows writing to the M2. There are 21 registers in this Function Code. The register assignments detailed below were implemented in M2 firmware version 5.0. Please see revision B of the M2 manual if you have an M2 with a firmware version previous to 5.0.
  • Page 56 Register 15 is the calibration timeout. Value is in minutes (5, 10, 15, 20, 25, or 30). Register 16 Register 16 is explained in “Supported Modbus Functions” in the M2 manual. Register 17 Register 17 is the calibration month (MSB) and day (LSB).
  • Page 57 Register 19 Register 19 is for clearing change flags. When parameters are changed at the M2, a flag is raised at the controller. This register can be used to clear those flags. Table 16: Register 19, Clear Change Flags Bit(s) Value &...

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