Related Manuals for RKI Instruments M2A
Summary of Contents for RKI Instruments M2A
- Page 1 M2A Transmitter UL 2075 Version Operator’s Manual Part Number: 71-0379 Revision: P2 Released: 6/25/21 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. 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.
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Page 4: Table Of Contents
Viewing & Changing M2A Parameters ........ - Page 5 Replacing Components of the M2A ........
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Page 6: Chapter 1: Introduction
The M2A displays the current gas reading on an OLED 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 recording device. -
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. -
Page 8: Chapter 2: Description
Chapter 2: Description Overview This chapter describes external and internal components of the M2A Transmitter. External Description This section describes the junction box and all external components of the M2A transmitter. 3/4 NPT Conduit Hub, Plugged Magnetic Junction Box Cover... - Page 9 Use the junction box’s two mounting holes to mount the M2A 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 OLED display and use the magnetic wand to actuate the magnetic control switches so you can perform non-intrusive calibration.
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Page 10: Internal Description
Two columns of plug-in style terminal strips are used to make all wiring connections to the M2A. The column on the left consists of the power/signal, detector, and Modbus terminal strips. The column on the right consists of the relay terminal strips. - 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 M2A and to connect the 4 - 20 mA output signal to a device.
- Page 12 M2A’s programs. Control Buttons The M2A includes three push button switches that allow you to enter the M2A’s operating modes, navigate through the modes, update settings, and save changes to the settings. The push button switches are located along the bottom edge of the control PCB (see Figure 3).
- Page 13 The M2A includes five status LEDs that are located above the display (see Figure 3). • Fail LED The fail LED turns on when the M2A is experiencing a fail condition. A fail condition can be caused by a detector failure or low detector signal. •...
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Page 14: 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 M2A is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures. •... -
Page 15: Wiring The M2A Transmitter
WARNING: If the M2A is installed in a hazardous location, use appropriately rated conduit, conduit fittings, and appropriate construction technique that complies with the local electrical code. - Page 16 The number of cables or wires needed will depend on whether the M2A is wired to a recording device or just to power and whether any relays are used.
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Page 17: Start Up
If necessary, turn on the recording device that is connected to the M2A. The OLED display will indicate the firmware version when the M2A is first powered up and will then count down a one minute warm-up period before normal operation begins. During normal operation, the display will indicate the target gas and current gas reading. - Page 18 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 32. Verify that the M2A 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%).
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Page 19: 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 20: 4 - 20 Ma Signal Output Operation
Calibration Mode is entered and a calibration is performed. In this situation, the signal output will be fixed at 3.5 mA from the time Gas Type Mode is entered until the M2A is calibrated and returns to normal operation. -
Page 21: Alarm Indications
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 22 The alarm 2 relay energizes. 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.
- Page 23 The fail relay de-energizes. NOTE: The low power alarm cannot be cleared using the ENTER button. 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.
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Page 24: Chapter 5: Configuration Mode
If you are installing a new M2A, it has been setup at the factory. Use Configuration Mode only if you want to change the M2A’s setup. If you want to change the detector type see “Chapter 6: Gas Type Mode”... - Page 25 15 - 60 minutes. A1 OffDy (alarm 1 off delay) The amount of time the M2A delays turning off the alarm 1 circuit once an alarm (0 sec.) 1 condition passes. This parameter appears only if the alarm 1 relay reset setting is set to SELF-RST.
- Page 26 OVER? YES/NO message will display. Press and release the UP/YES button. The Re-do Config message will display and the 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.
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Page 27: 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. The combustible gas/CO and toxic/oxygen M2As have a different terminal PCB and run on different firmware. - Page 28 To save the gas type, press and release the UP/YES button. The display will indicate Gas Type Updated, the display will indicate the target gas and the detection range for a few seconds, and then the M2A will enter Configuration Mode automatically so that the parameter settings in Configuration Mode can be verified or changed.
- Page 29 11. See “Calibration” on page 32 for calibration instructions. NOTE: When calibrating an M2A after changing the gas type, the M2A 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.
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Page 30: Chapter 7: Maintenance
Daily Verify a display reading of zero. Investigate significant changes in the reading. Biannually Calibrate the M2A as described in “Calibration” on page 32. See “Calibration Frequency” on page 31 for a discussion of calibration frequency guidelines. Troubleshooting The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the M2A. -
Page 31: Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 6 to 12 months is adequate for most M2A applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 6 months. -
Page 32: 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 M2A’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 33 This feature enables one person to perform a calibration if the detector is mounted remotely from the M2A. When zero air is applied to the M2A during a fresh air adjustment, the M2A will freeze the display reading at the lowest response and the M2A will continue to display this reading and retain it in its memory until the fresh air adjustment procedure is completed.
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Page 34: Replacing Components Of The M2A
UP/YES and DOWN/NO buttons, then press and release the ENTER button. The M2A 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 35: Parts List
Allow the replacement sensor to warm up for 15 minutes before you continue with the next step. Calibrate the detector as described in “Calibration” on page 32. Parts List Table 8 lists replacement parts and accessories for the M2A Transmitter. Table 8: Parts List Part Number... - Page 36 Table 8: Parts List Part Number Description 81-1051RK Regulator, with gauge and knob, 0.5 LPM, for 34 liter aluminum/58 liter/103 liter calibration cylinders (cylinders with internal threads) 81-1117RK Calibration cup M2A Transmitter Operator’s Manual...
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Page 37: 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 9 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 38: Appendix B: Plc And Dcs Device Wiring
NOTE: If shielded cable is used for the PWR/SIG connections, leave the cable shield’s drain wire insulated and disconnected at the M2A. You will connect the opposite end of the cable’s drain wire at the recording device. M2A Transmitter Operator’s Manual... - Page 39 See Figure 8 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...
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