ATI Q46D Dissolved Oxygen System Part 8 – PID Controller
52
O&M Manual
Rev-N (4/21)
lead electrode around the post and replace the nut and washer. Tighten the nut firmly
but do not over tighten as damage to the sensing module can result. Wrap the remainder
of the lead around the sensor body. There is no need to secure the other end of the
lead.
9.32 Pressure Compensator Rebuild
On the side of the electrolyte chamber is a pressure compensator gland assembly. Refer
to Figure 18 - Flow Type D.O. Sensor Assembly for an exploded view of this assembly.
Normally, this assembly does not require service, but it is possible that the pressure
gland inside this assembly might be punctured if excessive pressure is applied.
Rebuilding the gland is relatively easy using the parts supplied with the sensor.
You will need either a torque wrench (preferred) or a wide bladed screwdriver to remove
the retaining nut. Unscrew the nut and set it aside. Then carefully remove the old gasket
and membrane. A small tweezers is useful in handling the replacement parts.
Carefully place a new membrane (clear material) into the gland recess. Place a white
gasket on top of the clear membrane. Replace the retaining nut, tightening it just enough
to ensure that the white gasket material compresses for a good seal. To test the
integrity, put a new membrane on the bottom of the chamber and fill the chamber with
water. Look for any liquid leaks coming from the gland area. If you note leakage, tighten
the nut a bit more.
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