Ametek Thermox 2000 ATEX Series User Manual page 150

Cell Replacement/Cleaning
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7-4 | Thermox Series 2000 WDG-HPII / HPIIC - ATEX
To replace or clean the cell, do the following (see Figure 7-2):
Disconnect power from the sensor and control unit and allow the
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sensor to cool before replacing parts inside the sensor.
CAUTION
Remove the sensor cover to expose sensor components.
Remove the cell clips.
Loosen the lower hex nut (not the top hex nut) while holding the top
of the cell housing with a backup wrench, then remove the entire cell
assembly. Note that loosening the cell may require a good deal of
torque.
If cleaning the cell, wash with water or alcohol. Dry the cell thor-
oughly before reinstalling and 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-
2.
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
lower 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
NOTE
hour).
Perform a primary calibration if you replaced the cell.