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RKI Instruments M2A 65-2643RK-05-04 Operator's Manual

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65-2643RK-05-04
M2A Transmitter
Operator's Manual
Part Number: 71-0387
Revision: E
Released: 9/9/20
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments M2A 65-2643RK-05-04

  • Page 1 65-2643RK-05-04 M2A Transmitter Operator’s Manual Part Number: 71-0387 Revision: E Released: 9/9/20 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 WARNING Read and understand this instruction manual before operating instrument. Improper use of the gas monitor could result in bodily harm or death. Periodic calibration and maintenance of the gas monitor is essential for proper operation and correct readings. Please calibrate and maintain this instrument regularly! Frequency of calibration depends upon the type of use you have and the sensor types.
  • 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

    Table of Contents Chapter 1: Introduction ..........6 Overview .
  • Page 5 Chapter 7: Maintenance ..........33 Overview.

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2643RK-05-04 M2A Transmitter. This chapter also describes the 65- 2643RK-05-04 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

    Specifications Table 1 lists specifications for the M2A. Table 1: M2A Specifications Target Gas/Detection Range Oxygen: 0 - 25.0% volume, 0.1% increments Alarm Settings (Alarm 1/Alarm 2)* 19.5% volume (decreasing)/23.5% volume (increasing) Construction (housing) Explosion-proof junction box, NEMA 4X Area Classification Explosion-proof for Class I, Groups B, C, and D Sampling Method Diffusion...

  • Page 8: Chapter 2: Description

    Chapter 2: Description Overview This chapter describes the components of the M2A transmitter. The transmitter is a 4 - 20 mA type detector head. It consists of the oxygen detector, calibration adapter/splash guard, terminal PCB, the M2A junction box, and the detector junction box.
  • Page 9 M2A Junction Box The M2A’s cast aluminum junction box is dust and weather resistant. The junction box also protects the M2A and all connections made to it. Use the three 3/4 NPT conduit hubs to wire the remotely installed combustible gas detector and connect wiring from an external device, typically an RKI controller.
  • Page 10 Detector Housing Body The detector housing body protects the electronic components within the housing. Use the mounting threads at the top of the housing to screw the oxygen detector into the 3/4 NPT hub on the bottom of the detector junction box.

  • Page 11: Internal Description

    Internal Description This section describes the internal components of the M2A. The internal components of the M2A include the terminal PCB which provides for all the wiring connections to the M2A and the control PCB which displays the gas reading and has the control buttons. 3/4 NPT Conduit Opening, Plugged Control PCB Terminal PCB...
  • Page 12 Power/Signal Terminal Strip Relay Detector Terminal Strip Terminal Strips Programming Connector (Factory Use) Ribbon Cable Connector Ground Jumper Modbus Terminal Strip Termination Jumper Figure 4: Terminal PCB Component Location Power/Signal Terminal Strip The power/signal terminal strip is a three position plug-in style terminal strip located at the top of the left terminal column.
  • Page 13 The jacks retain the control PCB. Alarm 1 LED Alarm 2 LED RX LED 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...
  • Page 14 Table 2: M2A Control Button Functions Switch Function UP (YES) • Saves settings • Changes the displayed setting • Enters the Calibration Program • Enters Gas Type Mode (press with DOWN/NO button) • Enters Configuration Mode (press with ENTER button) DOWN (NO) •...

  • Page 15: Chapter 3: Installation & Startup

    Chapter 3: Installation & Startup Overview This chapter describes procedures to mount the M2A Transmitter in the monitoring environment and wire it to input power and devices. Mounting the M2A Transmitter Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site.
  • Page 16 Ø3.65 2.70 3/4 Conduit Hub 5.25 Rubber Spacer, Oxygen Detector 11.60 Max Calibration Adapter/ Splash Guard 1.13 Figure 7: Outline & Mounting Dimensions, Detector Junction Box 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.

  • Page 17: Wiring The M2A Transmitter

    Wiring the M2A Transmitter Wiring the Detector to the M2A WARNING: Always verify that the power to the M2A is off before you make wiring connections. Confirm that no power is being applied to the M2A. Remove the detector junction box’s cover from the junction box. Remove the M2A junction box’s cover from the junction box.
  • Page 18 14. Pull out the detector terminal strip and connect the two wires to the terminal strip as follows (see Figure 8). • Connect the wire corresponding to the detector’s green wire to the OXY “-” terminal. • Connect the wire corresponding to the detector’s white wire to the OXY “+” terminal. CAUTION: If shielded cable is used, leave the cable shield’s drain wire disconnected and insulated at the detector junction box.
  • Page 19 Wiring the M2A to a Controller and Alarm Devices WARNING: If the controller’s construction is not explosion-proof, the controller must be installed in an ordinary location. Do not install a non-explosion-proof controller in a classified location. If the controller’s construction is explosion-proof and the controller is installed in a classified location, install a conduit seal at the controller’s wire entry location that is consistent with the controller’s explosion-proof rating.

  • Page 20: Start Up

    Alarm Device RKI Controller Power Terminals Fail Alarm (24 VDC) + Device 4 - 20 mA In (S) Alarm 1 (24 VDC) - Alarm Device Detector Wiring Alarm 2 Alarm Device Modbus Typical Alarm Wiring Wiring Shown Figure 9: Wiring the M2A Junction Box to a Controller and Alarm Devices Re-install the control PCB (and ribbon cable if necessary).
  • Page 21 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 22: Chapter 4: Operation

    Chapter 4: Operation Overview This chapter describes the M2A in normal operation. This chapter also describes the M2A 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

    4 - 20 mA Signal Output Operation The output at the S terminal of the power/signal terminal strip is a 4 - 20 mA signal that corresponds to the detection range of the M2A. During normal operation, this signal tracks the gas concentration on the OLED display.
  • Page 24 Table 4: Visual and Audible Alarm Indications Condition Cause Visual Indication(s) Low Power DC power source less than 9.5 volts. • F LED is on • LowPower message and actual voltage of incoming DC power If the M2A 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.
  • Page 25 NOTE: If the M2A 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 an increasing oxygen concentration condition.
  • Page 26 When the voltage increases to 10.0 volts, the low power alarm is cleared and the M2A will begin its warm-up sequence. Responding to a Low Power Condition Determine and correct the cause of the low power condition. 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.

  • Page 27: Chapter 5: Configuration Mode

    Chapter 5: Configuration Mode Overview This chapter describes how to view and change M2A parameters using Configuration Mode. It is accessed using the program buttons. Configuration Mode includes a 5-minute time-out feature. If you do not press a control button for 5 minutes, the M2A automatically returns to normal operation.
  • Page 28 Table 5: Configuration Parameters (Continued) Parameter Description (Factory Set Value) ALARM-1 (relay action) If set as N. DE-EN, the alarm 1 relay is de-energized in normal (N. DE-EN) operation and energizes when an alarm 1 condition is initiated. If set as N. EN, the alarm 1 relay is energized in normal operation and de-energizes when an alarm 1 condition is initiated.
  • Page 29 Table 5: Configuration Parameters (Continued) Parameter Description (Factory Set Value) ZeroSupp The zero suppression feature helps prevent “jumpy” readings near the (0.5% volume) fresh air reading. For example, if the zero suppression is 0.5%, the M2A will display a reading of 20.9% for gas readings from 20.4% to 21.4%. It is settable from 0 to 6% volume.

  • 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 M2A’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 65-2643RK-05-04 is oxygen.
  • Page 31 Table 6: Gas Types Gas Type Detection Range Choices ASH3 0 - 1.50 ppm 0 - 50.0 ppm CLO2 0 - 1.00 ppm CLO2 0 - 3.00 ppm 0 - 500 ppm 0 - 200 ppm 0 - 15.0 ppm CLO2 0 - 5.00 ppm 0 - 5.00 ppm...
  • Page 32 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. 11.

  • Page 33: Chapter 7: Maintenance

    Chapter 7: Maintenance Overview This chapter describes procedures for performing preventive maintenance, troubleshooting, calibrating the M2A, and replacing field replaceable parts. Preventive Maintenance This section describes a recommended preventive maintenance schedule to ensure the optimum performance of the M2A. It includes daily and quarterly procedures. Daily Verify a display reading of 20.9% volume.
  • Page 34 Table 7: Troubleshooting the Oxygen Detector (Continued) Condition Symptom(s) Probable Causes Recommended Action Frequent or The M2A alerts you to • The M2A is 1. Verify that the M2A wiring is experiencing false properly shielded. See “Wiring the Suspect frequent or suspect readings due to RFI M2A Transmitter”...

  • Page 35: Calibration Frequency

    3 to 6 months is adequate for most oxygen 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 combustible and toxic gases are not normally present and calibration adjustments are minimal at calibration, then a calibration frequency of every 6 months is adequate.

  • Page 36: Calibration

    Turn the regulator’s on/off knob clockwise to close the regulator. Unscrew the regulator from the calibration cylinder. Disconnect the calibration adapter/splash guard’s flexible tubing from the regulator. NOTE: Do not disconnect the flexible tubing from the calibration adapter/splash guard. 10. Add 1 minute to the length of time determined in step 6. This is the response time for the detector. When performing a fresh air adjustment or zero adjustment, gas must be applied for this length of time.
  • Page 37 air adjustment, the M2A will freeze the display reading at the highest response and the M2A will continue to display this reading and retain it in its memory until the fresh air adjustment procedure is completed. When calibration gas is applied to the M2A during a zero adjustment, the M2A will freeze the display reading at the lowest response to the calibration gas.

  • Page 38: Replacing Components Of The Oxygen Detector

    Unscrew the calibration gas cylinder from the fixed flow regulator. The M2A will continue to display the minimum gas response on the display and retain the response level in its memory. Adjust the oxygen reading up or down to match the 100% nitrogen cylinder oxygen concentration of 0% by using the UP/YES and DOWN/NO buttons.
  • Page 39 Replacing the Oxygen Detector NOTE: In most cases, it is only necessary to replace the plug-in oxygen sensor. Turn off or unplug power to the M2A. Remove the detector junction box cover. Unscrew the calibration adapter/splash guard from the detector housing cap. Disconnect the detector leads from the terminal block in the detector junction box.

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

    Chapter 8: RS-485 Modbus Output Overview This chapter describes the M2A’s RS-485 Modbus output and how to configure the M2A to make use of it. It also discusses how to wire the M2A into a Modbus system. The M2A provides an RS-485 serial communications interface. It is a Modbus Slave Device, supporting 2-wire RS-485 Modbus RTU serial communications.
  • Page 41 Recommended Modbus Wiring The recommended Modbus wiring for the M2A is illustrated in Figure 10 below. In this configuration, 5 wires are used for wiring the M2A into a Modbus system. Figure 10 also illustrates typical alarm device wiring. The ground jumper must be removed in this wiring configuration.
  • Page 42 Adding an M2A to an Existing M2 Modbus Installation with Alternate Wiring 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. Termination Jumper The M2A includes a 2-pin termination header (see Figure 4 on page 12) that is used when the M2A is used in a Modbus system.

  • Page 43: Using The M2A In A 4-Wire Modbus System

    Using the M2A in a 4-wire Modbus System Although the M2A 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 44 Table 9: Configuration Parameters Modbus Mode Parameter Available Settings & Description Enabled/Disabled Can be set to ENABLED or DISABLED (factory setting). Enables or disables the Modbus output. Slave ID The Slave ID can be set to values from 1 (factory setting) to 247. The M2A will only receive messages from the Master which are addressed to this Slave ID (except for broadcast messages which are received by all slaves).

  • Page 45: Supported Modbus Functions

    Supported Modbus Functions The M2A supports Function Code 03: Read Holding Registers and Function Code 16: Write Registers. Function Code 03: Read Holding Registers There are a total of 40 registers available to be read via this Function Code. Registers 1 - 2 The format (bit &...
  • Page 46 Table 11: Register 2, Operating State, Alarms & Relays Bit & Field Assignments (Continued) Bit(s) Value Fail Status 0 = Fail Not Asserted 1 = Fail Asserted [7:6] Alarm 2 Status 0 = No Alarm 1 = Unacknowledged Alarm 2 = Acknowledged Alarm 3 = Unused Code [5:4] Alarm 1 Status...
  • Page 47 Registers 15 - 19 Registers 15 - 19 are the Gas Name ASCII String (NULL Terminated). Registers 20 - 22 Registers 20 - 22 are the Gas Units String (NULL Terminated). Register 23 Register 23 is the alarm 1 trigger. 0=Decreasing 1=Increasing Register 24...
  • Page 48 Register 33 Register 33 is zero suppression. Toxics and LEL: 0%-6% of full scale Oxygen: 0%-0.7% Oxygen The decimal point location is the same as specified in Register 1. Register 34 Register 34 is noise filter. Integer values in seconds. 0-60 in 5 second increments.
  • Page 49 Function Code 16: Write Registers There are 21 registers in Function Code 16 that can be used to write to the M2A. This manual only describes Register 16 because it can be used to reset an alarm condition. For a complete description of Function Code 16, see “Appendix C: Function Code 16 Registers”...

  • Page 50: Chapter 9: Parts List

    Chapter 9: Parts List Table 13 lists replacement parts and accessories for the M2A 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) 07-0033RK Detector housing cap gasket 18-0400RK-01 Detector junction box, with spacers 18-0431-01-01...

  • Page 51: Appendix A: Control Button Quick Reference Guide

    Appendix A: Control Button Quick Reference Guide The M2A’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. While in these modes, display prompts showing a “?” require you to respond by pressing either the UP/YES (for yes) or DOWN/NO (for no) button.

  • Page 52: Appendix B: Plc And Dcs Device Wiring

    Appendix B: PLC and DCS Device Wiring The M2A can be wired to a PLC or DCS device if desired. Guide multi conductor shielded cable or cables or wires in conduit through the top conduit hub of the junction box. The number of cables or wires needed will depend on whether any relays are used and whether the Modbus output is used.
  • Page 53 See Figure 14 below for field wiring connections to the M2A. 24 VDC Power Supply 24 VDC + Alarm Device Power 24 VDC - Fail Alarm Device 4 - 20 mA In (S) (24 VDC) - Alarm 1 Alarm Device Detector Controller Wiring...

  • Page 54: Appendix C: Function Code 16 Registers

    Appendix C: Function Code 16 Registers The M2A supports Function Code 16 that allows writing to the M2A. There are 21 registers in this Function Code. Register 1 Register 1 is the alarm 1 set point. Value must be an integer. Any decimals are omitted. Register 2 Register 2 is the alarm 1 trigger.
  • Page 55 Register 10 Register 10 is the alarm 2 relay reset. 0=Latching 1=Self-Resetting Register 11 Register 11 is the alarm 2 ON delay. Integer value is in seconds. Register 12 Register 12 is the alarm 2 OFF delay. Integer value is in seconds. Register 13 Register 13 is the zero suppression.
  • Page 56 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 65-2643RK-05-04 M2A Transmitter Operator’s Manual...

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