RKI Instruments 65-2422RK-05 - Manual (Page 7)

65-2422RK-05 H
2
S Transmitter • 3
H
2
S Detector
The H
2
S detector includes the detector housing body, detector housing cap, cap gasket,
rubber boot, spacer, and the plug-in H
2
S sensor.
Figure 2: H
2
S Detector Component Location
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 H
2
S detector into the 3/4” NPT
hub on the bottom of the junction box. Two wires extend from the top of the detector
housing body. Use these wires to connect the H
2
S detector to the amplifier. One of the
wires is red and one of the wires is black.
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.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and
protects it from damage. The housing cap also includes a flame arrestor which contains
any sparks that may occur within the detector and a flame arrestor guard which protects
the flame arrestor from damage. Unscrew the detector cap to access the plug-in sensor for
maintenance or replacement. A cap gasket seals the interface between the housing and
cap.
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.
Plug-In H
2
S Sensor
The sensor is secured within the sensor housing by the four pins. Through a series of
Spacer
Rubber Boot
H2S Plug-in Sensor
Flame
Arrestor
Guard
Detector
Housing Cap
Detector Housing Body
Cap Gasket