65-2427-05-01 H
2
S Detector • 7
65-2428-01 H
2
S Detector
The 65-2428-01 H
2
S detector consists of the detector housing body, detector housing cap, cap
gasket, rubber boot, spacer, and the plug-in sensor.
Figure 2: 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 3/4
NPT mounting threads at the top of the housing to screw the H
2
S detector into the bottom
conduit hubs of the junction box. Use the removable cap near the bottom of the housing to
access the plug-in sensor for maintenance or replacement. The cap protects the plug-in 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
H
2
S detector to the junction box terminal strip. The housing includes a four-socket pattern.
This socket pattern accepts the plug-in 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 sensor remains plugged into the detector housing body.
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
Spacer
Rubber Boot
H2S Plug-in Sensor
Flame
Arrestor
Guard
Detector
Housing Cap
Detector Housing Body
Cap Gasket
