Cell Replacement/Cleaning - Ametek Thermox CEM/O2 User Manual

Cell Replacement/Cleaning

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7-2 | Thermox CEM/O2 Analyzer
Disconnect power from the sensor and control unit and allow the sen-
sor to cool before replacing parts inside the sensor.
Use Figure 7-1:
Open the sensor cabinet door to expose sensor components.
Remove the cell clips.
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.
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NOTE
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.
Place the cell O-ring on top of the cell housing as shown in Figure 7-1.
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.
Place the ceramic spacer ring over the top hex nut.
Reinstall the cell clips. The clip that goes inside the open end of the
cell must be fully seated. The bottom cell clip must be placed on top of
the ceramic spacer ring.
Before performing a primary calibration, first connect power to the
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sensor and allow it to heat up and stabilize (approximately one hour).
NOTE
Perform a primary calibration if you replaced the cell.