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Thermo-
couple port
Test Port
Fitting a New Wandering Thermocouple
The autoclave is fitted with two thermocouple entry ports located behind the large patch
panel on the right-hand side of the autoclave. The large port is intended for multiple test
probes for use during Performance Qualification and the smaller port is intended for use with
the wandering thermocouple used for Load Sensed Process Timing. To remove the old
thermocouple first unplug it from its connection to the main control board and then undo and
remove the compression nut from the fitting (see diagram).
Using a suitable blunt instrument, from the inside of the pressure vessel push out the silicone
rubber bung from the fitting, and remove it from the thermocouple. Next, insert the new
thermocouple, It may be necessary to re-slit the bung to do this. Place the nut washer and
bung in position on the new thermocouple and re-fit. It is advisable to apply some silicone
sealant (such as bath sealant) to the joint to assist sealing. The joint should be checked for
leaks when the autoclave is first pressurised. Replacement bungs are available from
Priorclave, or alternatively use a No. 21 (large port) or a No. 13 (small port) silicone rubber
bung and trim the top end by about 5mm.
46
Trimmed & Split
Washer
Silicone Rubber
Bung
Compression Nut
Vessel Fitting
Entry Port Fitting Detail
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