Part 3 SES 2000 AUTOCLAVE
Page 30 of 43 ST-SM8l
PART 3 MAINTENANCE
Safety Valve (Fig. 3 item 5 and Fig. 7)
3.49 Test the safety valve as follows:
CAUTION
Ensure reservoir access cover is fitted
Fig. 2 (item 16)
Note
To cancel the safety valve test, switch-off the on/off
switch for 4 seconds, then switch it on again. This will
vent all pressure and water to the reservoir.
a Refer to Routine Calibration Procedure and carry
out the instructions in section 3.48 and run the
autoclave up to 134°C.
b When 134°C is reached, switch-off power at the
power on/off switch.
c Enter the ‘Engineering Mode’ (see section 3.27).
d Switch-on the heater by pressing and holding-in
switch 4 (Fig. 7).
e With the heater switched-on, the temperature will
rise without control from the controller. The safety
valve should start to vent at approximately 138.5°C
(read from the chart recorder). The temperature
and pressure should increase until the safety
valve operates and maintains pressure below a
maximum of 2.9bar (42 p.s.i.) at 142.5°C.
Operational Test
3.50 The safety valve should be checked every 12
months for correct function and test of set pressure, full
flow and reseat pressures. Particular care should be
taken with the use of sealing compounds and PTFE
tape to ensure that they do not enter the valve.
3.51 It is recommended that adjustments, maintenance
and repair of safety valves should only be carried out by
Eschmann personnel or accredited agents. Removal
and installation of the valve is a straightforward
procedure, but on installation, wrap
PTFE tape around
the valve threaded pipe fitting.
Controller Board with Daughter Board
Controller Board without Daughter Board
Fig. 8 Autoclave Controller Boards
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