RKI Instruments Beacon 200 Rig Monitor, LEL/H2S - Manual (Page 13)

Beacon 200 Rig Monitor Operator’s Manual • 8
The H
2
S detector is factory wired through the middle cable bushing of the
Beacon 200 and has a 25 foot cable for remote installation. The mounting
bracket at the top of each junction box is used to mount the junction box.
The junction box protects the detector wiring connections. Three spacers
installed on the back of the junction box control the distance of the junction
box from a mounting surface and ensure that there is enough room to
perform a calibration. A cover on the front of the junction box allows access
to the interior of the junction box.
The detector housing body protects the sensing components within the
housing body. Use the removable cap near the bottom of the housing body
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 body. A cap gasket
seals the interface between the housing body and cap. A flame arrestor
guard is permanently bonded to the cap.
The calibration cup/splash guard is screwed onto the bottom of the flame
arrestor guard.
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. A
pre-amplifier, located between the sockets and two interconnect wires,
conditions the sensor’s signal before the signal reaches the controller. A
rubber boot and spacer are installed on the sensor face to ensure that the
sensor remains plugged into the detector housing body.
Detector Housing Cap
Detector Housing Body
Cap Gasket
Flame Arrestor
Guard
Calibration Cup/
Splash Guard
Plug-In H2S Sensor
Figure 4. H
2
S Detector Component Location