65-2496RK/65-2499RK CO Detector • 3
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 CO detector into a 3/4” NPT hub.
Two wires extend from the top of the detector housing body. Use these wires to connect
the detector to a controller. One of the wires is black and one of the wires is red.
The housing body includes a four-socket pattern at the bottom of the housing body. The
plug-in sensor mates to this socket pattern. A pre-amplifier located between the sockets
and the two wires conditions the sensor’s signal before the signal reaches the controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the sensor and the rubber
boot with the charcoal filter and protects them from damage. A hydrophobic membrane
on the outside of the cap face keeps water and particulates away from the charcoal filter
and sensor face behind the cap. Unscrew the detector cap to access the charcoal filter and
sensor for maintenance or replacement. A cap gasket seals the interface between the
housing and cap.
Plug-In Sensor
The plug-in sensor is secured in 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 detector.
Charcoal Filter
The disc-shaped charcoal filter is secured to face of the CO sensor with a rubber boot. The
charcoal filter prevents interference gases such as hydrogen sulfide (H
2
S) and certain
hydrocarbons from producing false CO readings.
Junction Box
The junction box allows you to install the CO detector at a mounting site that is remote
from a controller and protects the detector wiring connections. Two conduit hubs allow
you to mount the CO detector to the junction box and connect the wiring from the
detector to a controller. Three spacers installed on the back of the junction box control the
distance of the junction box from a mounting surface and ensure that there is enough
room to install a calibration cup on the detector during calibration. A terminal block
within the junction box facilitates the wiring connections. A cover on the front of the
junction box allows access to the interior of the junction box.
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