RKI Instruments 65-2485RK-02 - Manual (Page 8)

4 • 65-2485RK-02 Multi Point 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.
H
2
S Detector
The detector consists of the detector housing body, detector housing cap, cap gasket,
rubber boot, spacer, and H
2
S sensor.
Figure 3: H
2
S Detector Component Location
Detector Housing, Housing Cap, & Cap Gasket
The detector housing protects the sensing components within the housing. Use the
mounting threads at the top of the housing to screw the H
2
S detector into a 3/4” NPT hub.
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. Use these wires to connect the H
2
S
detector to the multi-point detector. 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.
Rubber Boot and Spacer
A rubber boot and spacer are installed between the detector housing cap and the sensor.
They help ensure that the detector remains plugged into the detector housing body.
Sensor
The sensor is secured within the sensor housing by the detector housing cap. It has four
Cap Gasket
Detector Housing Body
Detector
Housing Cap
Flame
Arrestor
Guard
H2S Plug-in Sensor
Rubber Boot
Spacer