M2A-XL Transmitter Operator’s Manual
Chapter 2: Description
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Use the junction box’s two mounting holes to mount the M2A-XL 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. Removing the cover allows you to access the interior of the
junction box.
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.
Gas Detector
The gas detector senses the target gas and is mounted in a 3/4 NPT conduit port on the right
bottom side of the M2A-XL. A variety of detectors may be used with the M2A-XL. See the
sections below for descriptions of each type of detector.
Catalytic Detectors
The catalytic detectors have a 1/2 NPT thread and require a 3/4 NPT x 1/2 NPT reducer to install
in the detector port.
The table below outlines the M2A-XL part numbers and replacement detector part numbers for
the catalytic detectors.
Table 2: Catalytic Detectors
Target Gas, Range
M2A-XL Part
Number
Detector Used
Combustible Gas, 0 - 100% LEL
65-2640RK
61-0140RK (Catalytic UL version)
65-2640RK-05
61-0140RK-05 (Catalytic CSA version)
Hydrogen, 0 - 100% LEL
65-2641RK
NC-6205-01 (Catalytic UL version, hydrogen
specific)
65-2641RK-05
NC-6205-05 (Catalytic CSA version, hydrogen
specific)
Methane, 0 - 9000 ppm
65-2647RK
61-0140RKA (Catalytic UL version)
65-2647RK-05
61-0140RKA-05 (Catalytic CSA version)
