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Chapter 2: Description
65-2670XL-XX-07 M2A-XL Transmitter
WARNING: If the top conduit hub is used for wiring, be sure to seal the threads to ensure
water does not enter the junction box. See “Wiring the M2A-XL Transmitter” on
page 18 for complete wiring instructions.
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.
Detector Junction Box
The detector junction box is intended to be installed remotely from the M2A-XL junction box.
The detector is factory installed in the bottom 3/4 NPT conduit hub. A terminal strip is provided
for wiring connections and the detector is factory wired to one side of this terminal strip. The
other side of the terminal strip is for user-supplied wiring to the detector terminal strip located in
the M2A-XL junction box. This wiring should go through the top 3/4 NPT conduit hub. Three
spacers installed on the back of the junction box controls the distance of the junction box from a
mounting surface. A ground boss near the top conduit hub provides an external earth ground
connection.
Detector
The CT-7 style detector consists of the detector housing body, detector housing cap, cap gasket,
and the plug-in sensor.
The table below outlines the M2A-XL part numbers and replacement detector part numbers for
the detectors.
Target Gas, Range
M2A-XL Part
Number
Detector Used
Cl
2
, 0 - 3 ppm
65-2670-CL2-04
65-2302-CL2
Cl
2
, 0 - 10 ppm
65-2670-CL210-4
65-2302-CL2-10
ClO
2
, 0 - 1 ppm
65-2670-CLO2-04
65-2302-CLO2
ClO
2
, 0 - 3 ppm
65-2670-CLO2-34
65-2302-CLO2-3
HCN, 0 - 15.0 ppm
65-2670-HCN-15
65-2302-HCN-15
NH
3
, 0 - 100 ppm
65-2670-NH3-1-4
65-2302-NH3-100
NH
3
, 0 - 500 ppm
65-2670-NH3-5-4
65-2302-NH3-500
SO
2
, 0-10.0 ppm
65-2670-SO2-10
65-2302-SO2-10