RKI Instruments 65-2660RK-01-04 Operator's Manual
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RKI Instruments 65-2660RK-01-04 Operator's Manual

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65-2660XL-XX-04
M2A-XL Transmitter
Operator's Manual
Part Number: 71-0621
Revision: P1
Released: 12/15/22
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI Instruments 65-2660RK-01-04

  • Page 1 65-2660XL-XX-04 M2A-XL Transmitter Operator’s Manual Part Number: 71-0621 Revision: P1 Released: 12/15/22 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 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

    Table of Contents Chapter 1: Introduction ..........6 Overview .
  • Page 5 Chapter 7: Maintenance ..........35 Overview.

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the 65-2660XL-XX-04 M2A-XL Transmitter. This chapter also describes the 65-2660XL-XX-04 M2A-XL Transmitter Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the M2A-XL. About the M2A-XL Transmitter The M2A-XL transmitter is a fixed mount, continuous-monitoring detector head.

  • Page 7: Specifications

    Specifications Table 1 lists specifications for the M2A-XL. Table 1: M2A-XL Specifications Target Gas Carbon Dioxide (CO Detector 65-2660RK-01-04 65-2660RK-02-04 65-2660RK-03-04 65-2660RK-05-04 Detection Range 0 - 9,000 ppm 0 - 5,000 ppm 0 - 5.00% volume 0 - 50.0% volume...

  • Page 8: Chapter 2: Description

    Chapter 2: Description Overview This chapter describes the components of the M2A-XL transmitter. The transmitter is a 4 - 20 mA type detector head. It consists of the IR CO detector, calibration adapter/splash guard, terminal PCB, the M2A-XL 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 M2A-XL Junction Box The M2A-XL’s cast aluminum junction box protects the terminal PCB and wiring connections made to the terminal PCB. Use the three 3/4 NPT conduit hubs to wire the remotely installed IR detector and connect wiring from an external device, typically an RKI controller. The top hub is shipped with a factory installed and sealed conduit plug to avoid leaks into the junction box.

  • Page 10: Internal Description

    Magnetic Wand 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. Internal Description This section describes the internal components of the M2A-XL.
  • Page 11 Terminal PCB The terminal PCB is encapsulated in epoxy for protection against moisture and physical damage. It is mounted into the rear of the junction box with three standoffs and rests on a thin layer of foam. A banana jack is screwed into each of the standoffs and used for mounting the control PCB. The terminal PCB converts the electrical output from the detector to a signal which can be displayed by the OLED display, a 4 - 20 mA signal (that is proportional to the detection range), and an RS-485 Modbus output signal.
  • Page 12 Detector Terminal Strip The detector terminal strip is a four position plug-in style terminal strip and is the middle terminal strip in the left terminal column. All four terminals are used to connect the detector to the M2A- NOTE: The detector is factory-wired to the M2A-XL. See “Wiring the M2A-XL Transmitter” on page 17.
  • Page 13 PCB mounting standoffs and pushing it onto the banana jacks. The jacks retain the control PCB. Alarm 1 LED Alarm 2 LED RX LED Fail LED TX LED Magnetic Switches ENTER DOWN/NO RKI INSTRUMENTS UP/YES M2A-XL TRANSMITTER Push Button Control Switches OLED Display UP/YES DOWN/NO ENTER...
  • Page 14 Table 2: M2A-XL Control Button Functions Switch Function • Saves settings UP (YES) • Changes the displayed setting • Enters the Calibration Program • Enters Gas Type Mode (press with DOWN/NO button) • Enters Configuration Mode (press with ENTER button) •...

  • Page 15: Chapter 3: Installation & Startup

    Chapter 3: Installation & Startup Overview This chapter describes procedures to mount the M2A-XL Transmitter in the monitoring environment and wire it to input power and devices. Mounting the M2A-XL Transmitter 1. Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site.
  • Page 16 3/4 NPT 2.70 Female 3.65 9.00 MAX Rubber Spacer, J-Box IR CO2 Detector 5.25 Calibration Adapter/ Splash Guard Figure 6: Outline & Mounting Dimensions, Detector Junction Box 3. 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-XL junction box.

  • Page 17: Wiring The M2A-Xl Transmitter

    Wiring the M2A-XL Transmitter Wiring the Detector to the M2A-XL WARNING: Always verify that the power to the M2A-XL is off before you make wiring connections. 1. Confirm that no power is being applied to the M2A-XL. 2. Remove the detector junction box’s cover from the junction box. 3.
  • Page 18 12. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by grasping the wall between two terminal positions with needle nose pliers and pulling. Be careful not to exert too much force on the wall to avoid damage to the terminal strip. 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.
  • Page 19 15. If shielded cable is used between the detector junction box and the M2A-XL junction box, connect the cable’s drain wire to an available chassis (earth) ground at the M2A-XL junction box. Do not connect the shield drain wire at the detector junction box. Wiring the M2A-XL 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.
  • Page 20 • If the PWR/SIG connections and one or more relays are used, route the connections to the M2A-XL in conduit. Use shielded cable in the conduit for the PWR/SIG connections and unshielded cable or individual wires for the relay connections. Make sure any wire or cable used for relay wiring is appropriately rated for the power that it will carry.

  • Page 21: Start Up

    “Adjusting the Fresh Air Reading.” Adjusting the Fresh Air Reading When the M2A-XL is shipped from RKI Instruments, Inc., it is factory calibrated. If a full calibration is desired at startup, see “Calibration” on page 39.
  • Page 22 WARNING: The M2A-XL is not an active gas monitoring device during the fresh air adjustment procedure. The 4-20 mA output signal will “freeze” at 3.5 mA and all relays will remain in their non-alarm state while the M2A-XL is in Calibration Mode.

  • Page 23: Chapter 4: Operation

    Chapter 4: Operation Overview This chapter describes the M2A-XL in normal operation. This chapter also describes the M2A- XL in alarm 1, alarm 2, and fail conditions and suggests responses to these conditions. Normal Operation Normal operation is defined as follows: •...

  • Page 24: 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-XL. During normal operation, this signal tracks the gas concentration on the OLED display.
  • Page 25 Table 4: Visual and Audible Alarm Indications Condition Cause Visual Indication(s) • Disconnected or misconnected • F LED is on Fail detector wiring • FAIL message replaces • Display reading at -10% of full gas reading scale or lower NOTE: There is a 30 second delay on the fail condition.
  • Page 26 Alarm 2 Condition Alarm 2 Condition Indications When the gas reading reaches the alarm 2 setpoint, the M2A-XL senses an alarm 2 condition. The M2A-XL alerts you to an alarm 2 condition as follows: • The A2 LED turns on. •...
  • Page 27 Low Power Alarm Low Power Alarm Indications The M2A-XL senses a low power condition when the DC power source is 9.5 volts or less. WARNING: While in a low power condition, the M2A-XL is not an active gas monitor. When the M2A-XL senses a low power condition, it alerts you as follows: •...

  • Page 28: Chapter 5: Configuration Mode

    Chapter 5: Configuration Mode Overview This chapter describes how to view and change M2A-XL 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-XL automatically returns to normal operation.
  • Page 29 Table 5: Configuration Parameters (Continued) Parameter Description (Factory Set Value) ALARM-1 (activation) Indicates if the alarm 1 circuit is activated by gas readings (Increase) increasing (Increase) or decreasing (Decrease) to the ALARM-1 Level. ALARM-1 (relay action) If set as N. DE-EN, the alarm 1 relay is de-energized in normal (N.
  • Page 30 Table 5: Configuration Parameters (Continued) Parameter Description (Factory Set Value) A2 OnDy (alarm 2 on delay) The amount of time the M2A-XL delays activation of the alarm 2 (1 secs) circuit once an alarm 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.
  • Page 31 5. If you do not wish to save the adjustments and want to exit Configuration Mode, press and release the DOWN/NO button. The DO OVER? YES/NO message will display. Press and release the DOWN/NO button. The ABORT? YES/NO message will display. Press the UP/ YES button to return to normal operation.

  • Page 32: Chapter 6: Gas Type Mode

    Chapter 6: Gas Type Mode Overview This chapter describes how to use Gas Type Mode to select the M2A-XL’s gas type. The gas type determines the target gas and detection range. CAUTION: The 65-2660XL-XX-04 M2A-XL is factory setup for a specific range of carbon dioxide (CO ).
  • Page 33 Table 6: Gas Types Gas Type Detection Range Choices METHANE 0 - 100% Volume METHANE 0 - 100% LEL 0 - 5,000 ppm 0 - 9,000 ppm 0 - 100% volume 0 - 50.0% volume 0 - 5.00% volume METHANE 0 - 5.00% volume METHANE 0 - 8980 ppm*...
  • Page 34 9. After the M2A-XL completes its warm-up sequence, the display will indicate CAL NEEDED. Since the gas type has been changed, a successful calibration must be performed before the M2A-XL can enter normal operation. 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.

  • Page 35: Chapter 7: Maintenance

    Chapter 7: Maintenance Overview This chapter describes procedures for performing preventive maintenance, troubleshooting, calibrating the M2A-XL, and replacing field replaceable parts. Preventive Maintenance This section describes a recommended preventive maintenance schedule to ensure the optimum performance of the M2A-XL. It includes daily and biannual procedures. Daily Verify a display reading at the controller of the background concentration of CO .

  • Page 36: Troubleshooting

    Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the M2A-XL. NOTE: This troubleshooting guide describes M2A-XL problems only. If the M2A-XL is connected to a controller, see the controller operator’s manual for problems you may encounter with the controller.
  • Page 37 Table 7: Troubleshooting the IR CO Detector (Continued) Condition Symptom(s) Probable Causes Recommended Action • The M2A-XL is 1. Verify that the M2A-XL wiring is Flickering The display reading experiencing false properly shielded. See “Wiring Display flickers often. readings due to RFI the M2A-XL Transmitter”...

  • Page 38: Calibration Frequency

    Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 6 months is adequate for most infrared carbon dioxide transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 6 months.

  • Page 39: Determining Response Time

    Determining Response Time Since the detector junction box is installed remotely from the M2A-XL, the response time of the detector will depend on the length of flexible tubing that is attached to the calibration adapter/ splash guard. To determine the response time based on the length of tubing connected: 1.
  • Page 40 NOTE: The following procedure assumes the use of a calibration kit which includes a calibration gas cylinder, a 100% nitrogen cylinder and a fixed flow regulator with an on/ off knob. NOTE: The detector must be calibrated with a gas concentration between 10% and 100% of the channel’s full scale value (ie.
  • Page 41 Adjusting the Fresh Air Reading Since there is a background of CO in air of typically 300 - 600 ppm (0.03 - 0.06 %volume), it is necessary to use a calibration kit with a 100% nitrogen cylinder to set the zero signal of an M2A- XL with a low range detector (0 - 5000 ppm or 0 - 5.00% volume).
  • Page 42 Adjusting the Span Setting RKI Instruments, Inc. recommends using a calibration cylinder that is approximately 50% of the full scale value of your detector (for example, a calibration cylinder for the 0 - 5000 ppm range should have a concentration of approximately 2,500 ppm).

  • Page 43: Replacing The Ir Co Detector

    10. 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. 11. Store the components of the calibration kit in a safe place. Replacing the IR CO Detector 1.

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

    Chapter 8: RS-485 Modbus Output Overview This chapter describes the M2A-XL’s RS-485 Modbus output and how to configure the M2A-XL to make use of it. It also discusses how to wire the M2A-XL into a Modbus system. The M2A-XL provides an RS-485 serial communications interface. It is a Modbus Slave Device, supporting 2-wire RS-485 Modbus RTU serial communications.
  • Page 45 Ground Jumper The M2A-XL includes a 2-pin ground header (see Figure 3 on page 11) that is used when the M2A-XL is used in a Modbus system. Every M2A-XL is supplied with a ground jumper (a jumper block) installed onto this header. If the M2A-XL 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.
  • Page 46 Alternate Modbus Wiring For Existing Installations Although the wiring shown in Figure 9 is recommended, it is possible to wire the M2A-XL 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 47 Termination Jumper The M2A-XL includes a 2-pin termination header (see Figure 3 on page 11) that is used when the M2A-XL is used in a Modbus system. Every M2A-XL is supplied with a termination jumper (a jumper block) installed onto this header. If the M2A-XL is not used in a Modbus system, this jumper has no function.

  • Page 48: Using The M2A-Xl In A 4-Wire Modbus System

    Using the M2A-XL in a 4-wire Modbus System Although the M2A-XL 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 49 Table 9: Configuration Parameters Modbus Mode Available Settings & Description Parameter 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-XL 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 50: Supported Modbus Functions

    Supported Modbus Functions The M2A-XL 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 51 Table 11: Register 2, Operating State, Alarms & Relays Bit & Field Assignments (Continued) Bit(s) Value [10] Configuration Change 0=Not Changed 1=Changed Calibration Activity Flag 0=No Calibration Activity 1=Calibration Activity Has Occurred Fail Status 0 = Fail Not Asserted 1 = Fail Asserted [7:6] Alarm 2 Status 0 = No Alarm...
  • Page 52 Registers 4 - 11 The 16 bytes in these registers contain the same ASCII text information that is displayed on the M2A-XL’s OLED display (not NULL Terminated). Register 12 Register 12 is the range (full scale readout). Register 13 Register 13 is the alarm 1 set point. The decimal point location is the same as specified in Register 1.
  • Page 53 Register 29 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. Register 32 Register 32 is the alarm 2 OFF delay.
  • Page 54 Calibration Outcome Codes: 1=Sensor Missing 2=Sensor Too Weak 3=Signal Too Strong 4=Not Enough Span 5=Negative Reading 6=Span Gas Value Is Not OK 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 14=Operation Not Performed Register 39...

  • Page 55: Chapter 9: Parts List

    Chapter 9: Parts List Table 13 lists replacement parts and accessories for the M2A-XL 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) 18-0400RK-01 Detector junction box, with spacers 18-0440-01-01 M2A junction box 45-6132RK...

  • Page 56: Appendix A: Control Button Quick Reference Guide

    Appendix A: Control Button Quick Reference Guide The M2A-XL’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 “?”...
  • Page 57 Table 14: Control Button Quick Reference Chart Mode Entered or Button Function Adjustable or Viewable Parameters Combination Performed • Enable or Disable Modbus Modbus Mode Press and Hold DOWN/NO and • Slave ID ENTER for 5 • Baud Rate seconds •...

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

    Appendix B: PLC and DCS Device Wiring The M2A-XL can be wired to a PLC or DCS device if desired. 1. 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 59 See Figure 13 below for field wiring connections to the M2A-XL. 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 60: Appendix C: Function Code 16 Registers

    Appendix C: Function Code 16 Registers The M2A-XL supports Function Code 16 that allows writing to the M2A-XL. 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 61 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 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.
  • Page 62 Register 19 Register 19 is for clearing change flags. When parameters are changed at the M2A-XL, 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 &...
  • Page 63 65-2660XL-XX-04 M2A-XL Transmitter Appendix C: Function Code 16 Registers • 63...

This manual is also suitable for:

M2a-xl65-2660rk-02-0465-2660rk-03-0465-2660rk-05-04

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