RKI Instruments 65-2321RK - Manual (Page 7)

65-2321RK Oxygen Transmitter • 3
Oxygen Detector
The oxygen detector consists of the detector housing body, detector housing cap, cap
gasket, and the plug-in sensor.
Figure 2: Oxygen 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 oxygen 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 oxygen detector to the amplifier. One of the
wires is white and one of the wires is green.
The housing includes two sockets installed on a circuit board. These sockets accept the
plug-in sensor’s two pins to provide electrical connection for the sensor. The circuit board
with the sockets conditions the sensor’s signal before the signal reaches the amplifier.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and
protects it from damage. A foam gasket is installed inside the housing cap that seals
against the sensor face. A hydrophobic membrane on the outside of the cap face keeps
water and particulates away from the sensor face behind the cap. 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.
Plug-in Oxygen Sensor
The plug-in sensor is secured in the detector assembly by the housing cap. Through a
series of chemical and electrical reactions, the sensor produces a millivolt output that
corresponds to the detection range of the transmitter.
Plug-In Oxygen Sensor
Detector
Housing Cap
Housing Body
Cap Gasket
Hydrophobic
Membrane