2 • 65-2428 H
2
S Detector
Description
This section describes the components of the H
2
S detector. The detector consists of the
detector housing body, housing cap, cap gasket, rubber boot, spacer, and the H
2
S sensor.
Figure 1: H
2
S Detector Component Location
Detector Housing Body, Housing Cap, & Cap Gasket
The detector housing body 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 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.
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 four pins. Through a series of chemical
and electrical reactions, the sensor produces an electrical output that is proportional to the
detection range of the detector.
Spacer
Rubber Boot
H2S Plug-in Sensor
Flame
Arrestor
Guard
Detector
Housing Cap
Detector Housing Body
Cap Gasket
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