Cell Replacement - Ametek Thermox WDG Insitu User Manual

Cell Replacement

1.
2.
3.
4.
Wire End
Wrench Flats
on Inner Tube
Figure 7-2. Cell assembly.
5.
7-4 | Thermox Series 2000 WDG Insitu Analyzer
Disconnect power from the sensor and control unit and allow the sen-
sor to cool before replacing parts inside the sensor.
Removing the Cell
Remove the inner probe assembly.
Mark the position of the U-bolt in relation to the heater by drawing a
line on either side of the U-bolt on the top of the heater. This will help
you to determine how far the heater should be placed into the inner
probe assembly during reassembly.
Place a mark on the left hex nut of the cell assembly and one on the
inner probe assembly at the end with the wrench flats. This is so that
you can match the orientation of the white cell lead wire.
For example, if the white cell lead wire is positioned at 3 o'clock, place
a mark at 3 o'clock on the left hex nut of the cell assembly and inner
probe assembly. See Figure 7-1 for the location of the left hex nut.
Using a 3/8" nut driver, loosen the U-bolts around the heater but don't
remove them. Remove the 10-32 screw and lock washer on the sheet
metal plate using a flat blade screwdriver (Figure 7-2).
You may find it easier to involve two people to complete the next steps

if the probe is longer than 18 inches.
NOTE
Left Hex Nut
Metal O-Ring
Position a 1" open-end wrench on the wrench flats of the inner probe
assembly (Figure 7-2). Place another 1" open-end wrench on the left
hex nut of the cell assembly and break the seal by unscrewing the left
hex nut.
Right Hex Nut
Cell Housing
Cell Assembly
Cell End