65-2670XL-XX-07 M2A-XL Transmitter
Chapter 2: Description
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Detector Housing Body
The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the detector into the 3/4 NPT hub on the
bottom of the detector junction box. Two wires extend from the top of the detector housing body.
Use these wires to connect the detector to the terminal strip. One of the wires is color-coded for
each detector type.
The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four pins to
secure the sensor within the detector housing. A pre-amplifier, located between the sockets and
two interconnect wires, conditions the sensor’s signal before the signal reaches the controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. An adhesive backed gasket inside the detector
housing cap helps ensure that the sensor remains plugged into the detector housing body.It retains
the plug-in sensor and protects it from damage. Unscrew the detector cap to access the plug-in
sensor for maintenance or replacement. A cap gasket seals the interface between the housing and
cap.
Plug-In Sensor
The sensor is secured within the detector assembly by the housing cap. Through a series of
chemical and electrical reactions, the sensor produces an electrical output that corresponds to the
detection range of the transmitter.
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.
Hydrophobic Membrane
Plug-in Sensor
Detector
Housing Cap
Cap Gasket
Detector Housing Body
(different for each detector type)
Figure 2: Detector Component Location
