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

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M2 Transmitter
Operator's Manual
Part Number: 71-0107RK
Revision: D
Released: 10/7/10
RKI Instruments, Inc.
www.rkiinstruments.com

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  • Page 1 M2 Transmitter Operator’s Manual Part Number: 71-0107RK Revision: D Released: 10/7/10 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. M2 Transmitter Operator’s Manual...

  • Page 3: Product Warranty

    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

    Specifications Table 1 lists specifications for the M2. Table 1: M2 Specifications Target Gas/Detection Combustible Gas/Carbon Dioxide (CO Range • Catalytic LEL: 0 - 100% LEL, 1% LEL increments (CH calibration unless otherwise specified. H specific detector available) • IR (infrared) CH LEL: 0 - 100% LEL, 1% LEL increments •...
  • Page 8 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 9: Chapter 2: Description

    The M2’s cast aluminum junction box is dust and weather resistant. The junction box also protects the M2 and all connections made to it. Use the two 3/4 in. conduit hubs to mount the detector to the junction box (factory installed in the bottom hub) and connect wiring from an external device (top hub).
  • Page 10 The gas detector senses the target gas and is mounted in a 3/4” conduit hub on the right bottom side of the M2. A variety of detectors may be used with the M2. Table 2 below lists the detectors that can be used with the M2.
  • Page 11 Detector Housing Body Cap Gasket Oxygen Sensor Detector Housing Cap Flame Arrestor Guard Figure 2: 65-2514RK Oxygen Detector, CSA M2 Transmitter Operator’s Manual...
  • Page 12 The charcoal filter disk scrubs out interfering gases to which the CO sensor responds such as H S and certain hydrocarbons. Detector Housing Cap Gasket CO Sensor Rubber Boot w/Charcoal Filter Disk Detector Housing Figure 4: 65-2433RK-05 CO Detector, CSA M2 Transmitter Operator’s Manual...
  • Page 13 Cap Gasket CO Plug-in Sensor Charcoal Filter w/Rubber Boot Detector Housing Cap Hydrophobic Membrane Figure 5: 65-2496RK CO Detector Non-Explosion Proof Detector Housing Cap Gasket H2S Sensor Detector Housing Figure 6: 65-2423RK-05 H S Detector, CSA M2 Transmitter Operator’s Manual...
  • Page 14 You can then push the appropriate ESM-01 calibration cup onto the sensor. Detector Housing Body (different for each detector type) Cap Gasket Sensor (different for each detector type) Detector Housing Splash Guard (removable) Figure 8: ESM-01 Type Detector M2 Transmitter Operator’s Manual...

  • Page 15: 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 16 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 17 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 50 for a description of using the M2 in a Modbus system.
  • Page 18 The M2 includes five status LEDs that are located above the display (see Figure 9). • 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 19: Chapter 3: Installation & Startup

    Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site. • Select a site where the M2 is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures.
  • Page 20 Figure 12: Outline & Mounting Dimensions, IR Combustible & CO .25 Dia. Mounting 5.20 Hole, 2X 4.60 3/4 NPT Conduit 2.75 5.46 6.10 8.1 max 2.6 max 1 1/2-20 For Calibration Cup 1.10 Figure 13: Outline & Mounting Dimensions, Oxygen, Partial Pressure Type M2 Transmitter Operator’s Manual...
  • Page 21 Figure 14: Outline & Mounting Dimensions, Oxygen, Capillary Type Ø .25 Mouting Holes (2X) 2.75 4.60 3/4 Conduit Hub 5.46 7.0 max 1.50 max 1 1/2-20 For Calibration Cup Figure 15: Outline & Mounting Dimensions, Replaceable Sensor, Non Explosion Proof, S, CO, and Oxygen M2 Transmitter Operator’s Manual...
  • Page 22 Figure 16: Outline & Mounting Dimensions, CSA Type H S, CO, and Oxygen Ø .25 Mouting Holes (2X) 2.75 4.60 3/4 Conduit Hub 5.46 9.82 max 4.37 max Figure 17: Outline & Mounting Dimensions, ESM-01 Toxic M2 Transmitter Operator’s Manual...

  • Page 23: Wiring The M2 Transmitter

    Wiring the M2 Transmitter WARNING: Always verify that the power source is OFF before making any wiring connections. Remove the junction box cover. Grasp the control PCB by its edges. Gently pull until the control PCB is pulled away from the banana jacks. Take care not to pull too hard and damage the cable which connects the control and terminal PCB’s.
  • Page 24 OXY +, green wire to terminal labeled OXY -. Green White Figure 20: Partial Pressure Oxygen Detector Wiring Green White Figure 21: Capillary Oxygen Detector Wiring Green White Figure 22: CSA Capillary Type Oxygen Detector Wiring M2 Transmitter Operator’s Manual...
  • Page 25 Figure 24: H S/CO Detector Wiring, CSA • Non Explosion Proof CO or H S gas detector Red wire to terminal labeled TOXIC +, black wire to terminal labeled TOXIC -. Black Figure 25: H S/CO Detector Wiring M2 Transmitter Operator’s Manual...
  • Page 26 The number of cables or wires needed will depend on whether the M2 is wired to a gas monitoring controller or just to power, whether any relays are used, and whether the Modbus output is used. Use the following recommendations to determine how to wire the M2: •...
  • Page 27 • If the PWR/SIG 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 28: Start Up

    Versions” on page 40 or “Calibration, Oxygen Version” on page 43. Verify that the M2 is in a fresh air environment (environment known to be free of the target gas and combustible or toxic gas vapors and of normal oxygen content, 20.9%).
  • Page 29 Press and release the UP/YES button. ENTER will alternate with FreshAir on the top display line and the current gas reading will be on the bottom display line. Press and release the ENTER button. The M2 will perform a zero operation and the display will indicate SPAN w/Cal Gas?.

  • Page 30: 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 31: 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) for all gas types except oxygen. For oxygen types, the output will be fixed at 17.4 mA (20.9% oxygen) while the M2 is in warm-up.
  • Page 32 • 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 33 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 or toxic gas condition or an increasing oxygen concentration condition.
  • Page 34 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 35: Chapter 5: Configuration Mode

    If the currently displayed parameter is OK, press the ENTER button to proceed to the next parameter. Table 6 lists the M2 parameters you can set. Table 6 also lists the factory set value for each parameter. M2 Transmitter Operator’s Manual...
  • Page 36 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 37 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 38: 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. The combustible gas/CO and toxic/ oxygen M2s have a different terminal PCB and run on different firmware. Your M2 will only have gas type choices available that it can support.
  • Page 39 0 - 5.00 ppm GEH4 0 - 1.50 ppm 0 - 3.00 ppm CLO2 0 - 1.00 ppm B2H6 0 - 5.00 ppm ASH3 0 - 1.50 ppm 0 - 6.00 ppm 0 - 200 ppm M2 Transmitter Operator’s Manual...
  • Page 40 “Calibration, Oxygen Version” on page 43 for calibration instructions. 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 41: Chapter 7: Maintenance

    Verify a display reading of zero (20.9% for an oxygen M2). Investigate significant changes in the reading. Monthly This procedure describes a test to verify that the M2 responds properly to the target gas. NOTE: Performing a response test on the M2 may cause alarms. If you do not want external alarms to actuate, disable any external alarms during the response test to avoid unwanted external alarm indications.
  • Page 42 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, Combustible Gas, CO2, and Toxic Versions” on page 40 or “Calibration, Oxygen Version”...

  • Page 43: 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 44 Condition is disconnected or • Controller 2. Verify that the wiring between the misconnected. indicates a fail M2 and the controller is correct condition • The wiring from the and secure. M2 to the controller 3. Calibrate the M2. is disconnected or 4.

  • Page 45: Calibration Frequency

    3 to 6 months for M2s that do not have an IR detector and every 6 to 12 months for M2s that have an IR detector is adequate for most M2 applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc.
  • Page 46 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 47 Turn the regulator knob clockwise to close the regulator. Unscrew the zero air cylinder from the fixed flow regulator leaving the calibration cup on the detector. The M2 will continue to display the minimum gas response on the display and retain the response level in its memory.

  • Page 48: Calibration, Oxygen Version

    For an ESM-01 detector, pull the calibration cup off of the ESM-01 sensor and screw the splashguard back onto the detector housing cap. The M2 will continue to display the maximum gas response on the display and retain the response level in its memory.
  • Page 49 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 50 Turn the regulator knob clockwise to close the regulator. Unscrew the zero air cylinder from the fixed flow regulator leaving the calibration cup on the detector. The M2 will continue to display the maximum gas response on the display and retain the response level in its memory.

  • Page 51: Replacing Components Of The M2

    At the end of the 1 minute period, the REMOVE CAL GAS message will stop appearing and the M2 will return to normal operation.
  • Page 52 H S and certain hydrocarbons. If you are experiencing unexplained upscale readings on a CO M2, the charcoal filter may be saturated and no longer scrubbing out interfering gases and it may be necessary to change the charcoal filter.
  • Page 53 Turn off or disconnect power to the M2. Unscrew the detector housing cap from the housing body. Make sure not to lose the cap gasket. See Figure 4 for an illustration of the CO detector. Remove the rubber retaining boot with the charcoal filter disk from the sensor.
  • Page 54 NOTE: Allow the replacement sensor to warm up for 15 minutes before you continue with the next step. Calibrate the detector as described in “Calibration, Combustible Gas, CO2, and Toxic Versions” on page 40 M2 Transmitter Operator’s Manual...

  • Page 55: 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 32 M2s to be connected together without the need for a repeater. Figure 30 & Figure 31 below illustrate typical M2 wiring configurations. If more than 32 M2s need to be connected together, RS-485 repeater(s) should be used such that no more than 32 M2s reside on any given network segment.
  • Page 56 Figure 28: Recommended Modbus Wiring Alternate Modbus Wiring For Existing Installations Although the wiring shown in Figure 28 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 57 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 30 &...

  • Page 58: 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 59 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 60: 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 61 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). Register 12 Register 12 is the range (full scale readout).
  • Page 62 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. M2 Transmitter Operator’s Manual...
  • Page 63 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 M2 Transmitter Operator’s Manual...
  • Page 64 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 B from RKI Instruments, Inc.

  • Page 65: Parts List

    Parts List Table 15 lists replacement parts and accessories for the M2 Transmitter. Table 15: Parts List Part Number Description 06-1248RK Calibration kit sample tubing (3/16 in. x 5/16 in.; specify length when ordering) 07-0033RK Cap gasket, for CSA type CO and H...
  • Page 66 Oxygen detector, capillary type 65-2514RK Oxygen detector, CSA version, capillary type 71-0107RK M2 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 steel...
  • Page 67 ), for ESM-01, use 0.5 LPM flow 81-1138RK-CL2 Calibration cup, for ESM-01 Cl2, use 0.5 LPM flow 81-1138RK-NH3 Calibration cup, for ESM-01 NH3, use 0.25 LPM flow 81-1190RK Splashguard, for ESM-01 detector cap ES-1531-CO CO sensor, plug-in M2 Transmitter Operator’s Manual...
  • Page 68 ESM-01 plug-in sensor, 0 - 75.0 ppm ammonia, diffusion type only ESM-K01-D-CL2 ESM-01 plug-in sensor, 0 - 3.00 ppm chlorine, diffusion type only NC-6205-01 Hydrogen specific LEL detector, catalytic type, UL version NC-6205-05 Hydrogen specific LEL detector, catalytic type, CSA version M2 Transmitter Operator’s Manual...

  • Page 69: 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 16 shows which button combinations perform these functions and which parameters are available for adjustment while in the operational modes.

  • Page 70: Appendix B: 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 71 Register 18 is the calibration year. 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 17: Register 19, Clear Change Flags Bit(s) Value &...
  • Page 72 Register 20 Register 20 is the AutoZero Disable. 0=AutoZero Enabled 1=AutoZero Disabled M2 Transmitter Operator’s Manual...

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