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9.15 The Water Sensing Electrodes
The two electrodes that control the water level of the jacket are located
in a stainless steel bottle, or housing, connected to the rear of the
autoclave. The housing is connected to the jacket by upper and lower
copper tubes, which allows the jacket water to flow in and out of the
housing. The water level in the housing will be identical to the water
level in the jacket.
The High Electrode, which is physically higher when looking at the top
of the housing, determines the operational water level in the jacket.
The Low Electrode, which is physically lower when looking at the top
of the housing, protects the heaters by switching them off when there is
too little water in the jacket.
To clean or replace the electrodes proceed as follows (refer to drawings
on the next page:
Caution!
Before starting, ensure the electric cord is disconnected and there
is no pressure in the chamber or jacket.
1. Take off the autoclave cover (see para. 9.2 “Removing the
Autoclave’s Outer Covers”).
2. Discharge the steam pressure and drain the water from the jacket by
opening the water drain valve located at the rear of the autoclave.
(See sec 9.17)
3. Remove the electrical connections from the terminals of the
electrodes. Mark the wires for each electrode to avoid miss wiring
when reinstalling the electrodes.
4. Unscrew the locking nut and remove the electrode from the top of
the housing.
5. Replace the electrode with a new one or reinstall the same
electrode after cleaning.
5.1 To clean the electrode use a damp cloth or sponge. A mild
soapy solution may be used, rinse thoroughly. DO NOT use
any harsh chemicals
5.2 When positioning the new electrode, make sure to position the
high electrode tip so it is in line with the center of the
chamber. Position the low electrode so that it’s tip is
approximately 1”, but not les than 1”, lower than the high
electrode tip.
6. Tighten the locking nut to prevent any steam or water from leaking
out.
7. Reconnect the electrical wires to the electrode terminals. Making
sure to connect the correct wire to the proper electrode. If these
connections are reversed, the steam generator will not heat.
8. Close the drain valve and turn the autoclave on. The unit will
automatically fill with water. Observe that the unit is heating. Wait
for the unit to reach 30 psig, then check for leaks around the
locking nuts.
9. Reassemble the cover.
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