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Typical calibration frequencies for most applications are between 6 and 12 months, but can be required more often or less often based on your usage. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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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.
Selecting the Gas Type ..........24 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
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Appendix C: Function Code 16 Registers........49 (Appendix C available from RKI Instruments, Inc. Not included in manual as normally provided with M2 detector head.)
Chapter 1: Introduction Overview This chapter briefly describes the 65-2619RK-CH4-4 M2 Transmitter. This chapter also describes the 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the M2. About the M2 Transmitter The M2 transmitter is a fixed mount, continuous-monitoring detector head.
Modbus register assignments. See “Supported Modbus Functions” on page 40 for information on the current Modbus register assignments. The firmware version is shown on the Information Screen described on page 16. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
W and W indow 3/4" NPT Conduit Hub M2 Junction Box Detector Junction Box IR LEL Detector Calibration Adapter/ Splash Guard Figure 1: M2 External Components 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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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. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
The column on the right consists of the relay terminal strips. A 20 position connector at the bottom of the terminal PCB is used to connect the terminal PCB to the 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
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The relay contacts are rated at 115 VAC, 5 amps. The relay contacts may also be used to control higher rated relays. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
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Since displaying the Information Screen only requires the use of one switch, the wand may be used to show the Information Screen (see “Information Screen” on page 16). 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
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The alarm 2 LED is on when the M2 is experiencing an alarm 2 condition. • RX & TX LED’s These LED’s indicate data being received (RX) and transmitted (TX) when the M2’s Modbus output is operating. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...
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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 45 for available tubing. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
To make wiring more convenient, use wire colors that correspond to the detector wire colors: red, white, green, and black. NOTE: Consult RKI Instruments, Inc. for cable lengths longer than 200 feet. Connect the detector leads to the terminal block in the detector junction box.
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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 47, then continue with step 8. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
“Adjusting the Fresh Air Reading.” Adjusting the Fresh Air Reading When the M2 is shipped from RKI Instruments, Inc., it is factory calibrated. If a full calibration is desired at startup, see “Calibration” on page 31. Verify that the M2 is in a fresh air environment (environment known to be free of combustible or toxic gas vapors and of normal oxygen content, 20.9%).
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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. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
M2. Release the DOWN/NO button when you are done viewing the Information Screen. The display will return to the normal operation screen within a couple of seconds. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
• Display reading at -10% of full gas reading scale or lower NOTE: There is a 30 second • Defective components delay on the fail condition. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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The M2 alerts you to an alarm 2 condition as follows: • The A2 LED turns on. • The gas reading alternates with the ALARM-2 message. • The alarm 2 relay energizes. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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The message LowPower is indicated on the top line of the LCD and the input voltage is displayed on the bottom line of the LCD. • The fail relay de-energizes. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...
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When the input power increases above 19.0 volts, the M2 will begin its warm-up sequence. Verify that the M2 enters normal operation after its warm-up sequence. If necessary, perform a fresh air adjustment. See “Adjusting the Fresh Air Reading” on page 14. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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SELF-RST. 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. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
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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 M2 returns to normal operation. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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 65-2619RK-CH4-4 M2 is factory setup for methane (CH ). Do not change the Gas Type setting.
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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. See “Calibration” on page 31 for calibration instructions. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
Unscrew the calibration gas cylinder from the fixed flow regulator. 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. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
3. Increase the alarm on delay misconnected, or setting in Configuration Mode. intermittent. 4. If the frequent or suspect alarm difficulties continue, contact RKI for further instruction. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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5. If the calibration/response guard has become difficulties continue, replace the kinked, blocked, or detector. disconnected. 6. If the calibration/response difficulties continue, contact RKI for further instruction. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
6 months is adequate for most infrared combustible gas transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 6 months. If an application is not very demanding, for example detection in a clean, temperature controlled environment where calibration adjustments are minimal at calibration, then a calibration frequency of every 9 to 12 months is adequate.
M2 will freeze the display reading at the highest response to the calibration gas. The calibration gas can then be removed and the M2 will continue to display this reading and retain it in its memory until the span adjustment procedure is completed. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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Screw the calibration gas cylinder into the fixed flow regulator. Turn the regulator knob counterclockwise to open the regulator. Allow calibration gas to flow for the length of time determined in “Determining 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
(see Figure 6 on page 12). Screw the calibration adapter/splash guard onto the new detector. Reinstall the detector junction box cover. 10. Turn on or plug in power to the M2. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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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 31. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...
The recommended Modbus wiring for the M2 is illustrated in Figure 8 below. In this configuration, 5 wires are used for wiring the M2 into a Modbus system. Figure 8 also illustrates typical alarm device wiring. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
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Instead, the Common terminal on the Modbus controller is connected to the “-” of the 24 VDC power supply. Power Supply 24 VDC Detector Detector Additional Wiring Wiring Common Input Terminals Modbus Controller Figure 9: Alternate Modbus Wiring 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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ID = 3 ID = 4 ID = 127 Up to 128 M2s can be connected without a repeater. Figure 11: Multiple M2s in a Two Branch Configuration 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...
If the currently displayed parameter setting is OK, press the ENTER button to proceed to the next parameter. Table 9 lists the M2 Modbus Mode parameters you can set. Table 9 also lists the factory set value for each parameter. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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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. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www.
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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). 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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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 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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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 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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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.
• If the M2 will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus Output” on page 35. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...
The decimal point location is the same as specified in Register 1 of Function Code 03. Register 8 Register 8 is the alarm 2 trigger. 0=Decreasing 1=Increasing 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...
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Register 17 Register 17 is the calibration month (MSB) and day (LSB). This is zero-based (e.g. January=0 and the 1st=0). Register 18 Register 18 is the calibration year. 65-2619RK-CH4-4 M2 Transmitter Operator’s Manual GlobalTestSupply www. .com Find Quality Products Online at:...
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