7-4 | Thermox Series 2000 WDG-IV / IVC / IVCM
Cell Replacement/Cleaning
Disconnect power from the sensor and control unit and allow the sen-
sor to cool before replacing parts inside the sensor.
Use Figure 7-2:
1. Remove the sensor cover to expose sensor components.
2. Remove the cell clips.
3. While holding the top of the cell housing with a backup wrench,
loosen the lower hex nut (not the top hex nut), then remove the entire
cell assembly.
Loosening the cell may require a good deal of torque.
4. If cleaning the cell, wash with water or alcohol. Dry the cell thoroughly
before reinstalling. Always use a new cell O-ring.
If replacing the cell, discard the old cell and cell O-ring and retrieve
the new cell with supplied cell O-ring. Avoid touching the bare cell.
Instead, hold the cell by one of its hex nuts.
5. Place the cell O-ring on top of the cell housing as shown in Figure 7-2.
6. Insert the new cell into the cell housing. Do not touch the bare cell
when reinserting. Tighten the cell into the cell housing using the low-
er hex nut (the upper hex nut is pre-tightened at the factory). The cell
O-ring provides a seal for the system. Make sure it is evenly crushed
when tightening the cell.
Before performing a primary calibration, first connect power to the
sensor and allow it to heat up and stabilize (approximately one hour).
7. Perform a primary calibration if you replaced the cell.
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