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O&M Manual
Rev-N (4/21)
Part 5 – Sensor Assembly
5.1 Oxygen Sensor Preparation
The oxygen sensor supplied with the Q46D is shipped dry. It will not operate until it is prepared
by adding electrolyte and a membrane. Preparation of the sensor for operation must be done
carefully. The procedure should be done by a qualified technician, and it should only be done
when the system is ready for operation. Until then, it is best to leave the sensor in the condition in
which it is received.
Submersible oxygen sensors are made up of two separate parts, a submersion holder that also
contains the temperature compensating element and a sensing module. The sensing module
screws into the holder, with an o-ring providing a watertight connection. Figure 16 - Submersible
Sensor Assembly below shows the assembly.
Figure 16 - Submersible Sensor Assembly
Sensing modules contain the main measuring components, and are the main component
requiring service. Figure 17 below shows an exploded view of the D.O. sensing module.
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