RKI Instruments M2 Rig Monitor - Manual (Page 10)

5 M2 Rig Monitor Operator’s Manual
The H
2
S detector is installed in the junction box’s bottom conduit hub and is factory wired
to the M2 through the left cable bushing in the M2 junction box with a 25 foot cable for
remote installation. The mounting bracket at the top of the 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. 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.
The calibration cup/splash guard is screwed onto the bottom of the flame arrestor guard.
Figure 3: H
2
S Detector Component Location
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.
12 VDC Battery Cable
A 50 foot cable with clamps for connection to a 12 VDC battery (customer supplied
battery not included) is factory-wired through the bottom cable bushing of the M2. One
end of the cable is connected to the power converter PCB.
Spacer
Rubber Boot
H2S Plug-in Sensor
Detector
Housing Cap
Flame
Arrestor
Guard
Calibration Cup/
Splash Guard
Detector Housing Body
Cap Gasket