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O&M Manual
Rev-J (11/18)
Part 5 – Sensor Assembly
5.1
Chlorine Dioxide Sensor Preparation
The ClO
2
sensor supplied with the Q46H 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.
Figure 21 - ClO2 Sensor Assembly
Follow the procedure below to prepare the ClO
2
sensor for operation:
1. Unscrew the electrolyte chamber from the assembled sensor and also remove the vent screw
from the side of the sensor body.
2. Remove the front nut from the bottom of the chamber and discard the protective membrane.
O-rings are contained in grooves on both the bottom and top of the chamber. Be sure that
these o-rings remain in place.
3. From the package of membranes supplied with the sensor, place a new membrane into the
front nut.
The membrane is clear and is separated from other membranes by a blue
paper spacer.
4. Screw the front nut on to the chamber until you feel the o-ring compress. Hand tight
compression is all that is needed. Do not use tools to tighten. The membrane should be flat
across the bottom of the chamber without wrinkles.
5. Fill the chamber with electrolyte until the level reaches the bottom of the internal threads.
