RKI Instruments 65-2438 - Manual (Page 6)

2 • 65-2438 CO Detector
Description
This section describes the components of the CO detector. The detector consists of the CO
sensor, charcoal filter with rubber boot, detector housing body, detector housing cap, and
cap gasket.
Figure 1: CO Detector Component Location
Detector Housing, Housing Cap, & Cap Gasket
The detector housing body protects the sensing components within the housing. Use the
3/4” NPT mounting threads at the top of the housing to screw the CO detector into the
bottom conduit hubs of the junction box. Use the removable cap near the bottom of the
housing to access the sensor for maintenance or replacement. The cap protects the sensor
from damage and includes a flame arrestor which contains any sparks which may occur
within the detector housing. A cap gasket seals the interface between the housing and cap.
A flame arrestor guard is permanently bonded to the cap.
Two wires extend from the top of the detector housing body. Use these wires to connect
the CO detector to a controller. 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.
Plug-In Sensor
The sensor is secured within the sensor housing by four pins. 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 the face of the CO sensor with a rubber boot.
The charcoal filter prevents interference gases (hydrogen sulfide [H
2
S] and certain
hydrocarbons) from producing false CO readings.
Detector Housing Cap
Rubber Boot With
Charcoal Filter
Plug-In CO Sensor
Cap Gasket
Detector Housing Body
Flame Arrestor
Guard