RKI Instruments 65-2340RKSS - Manual (Page 7)

65-2340RKSS Toxic Gas Transmitter • 3
Toxic Detector
The toxic detector consists of the detector housing body, detector housing cap,
splashguard, cap gasket, and the plug-in sensor.
Figure 2: Toxic 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 toxic 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 toxic detector to the amplifier. One of the
wires is black and one of the wires is color coded depending on the detector type. See
Figure 4 on page 7 for the color code assignments.
The housing body includes a 12 position connector at the bottom of the housing body. The
plug-in sensor mates to this connector. A pre-amplifier located between the connector and
the two interconnect wires conditions the sensor’s signal before the signal reaches the
controller. Each plug-in sensor type (Cl
2
for example) requires a different pre-amplifier, so
there is a different detector housing body for each gas type.
Housing Cap, Cap Gasket, & Splashguard
The housing cap screws onto the detector housing. It retains the plug-in sensor and
protects it from damage. A removable splashguard is screwed onto the detector cap to
protect the sensor from impact damage, direct water spray, and splashing. Unscrew the
detector cap to access the sensor for maintenance or replacement. A cap gasket seals the
interface between the housing and cap.
Plug-In Sensor
The plug-in sensor is secured in the detector assembly by the housing cap. There is a
different sensor for each target gas. Through a series of chemical and electrical reactions,
the sensor produces an electrical output that corresponds to the detection range of the
sensor.
Amplifier
The amplifier converts the electrical output from the detector to a 4 to 20 mA signal that
corresponds to the detection range and transmits the signal to a gas monitoring controller.
Splash Guard
(removable)
Sensor
(different for each detector type)
Detector Housing
Cap
Cap Gasket
Detector Housing Body
(different for each detector type)