M2A Transmitter Operator’s Manual 11
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. A variety of detectors may be used with the M2A. 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 part numbers and replacement detector part numbers for the catalytic
detectors.
Table 2: Catalytic Detectors
Figure 2: Catalytic Sensors
Target Gas, Range M2A 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)
Detector Part Numbers
61-0140RK
61-0140RKA
NC-6205-01
UL Version
Detector Part Numbers
61-0140RK-05
61-0140RKA-05
NC-6205-05
CSA
Version
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