Boekel Scientific 25515016 Cement Autoclave - Manual (Page 5)

Current Type AC
Frequency, Cycles 50/60
Maximum Current Demand, Amperes 15.7
Maximum Power Consumption, Watts 1800
4. Operation
4.1 Trial Runs
It is suggested that three or more trial runs be made before using the autoclave to learn
how to operate it and to determine its characteristics. In these trial runs the autoclave
should be loaded with dummy specimens but should be operated step by step. Time
records of temperature, pressure and data on other significant factors should be kept to
provide a basis for establishing a uniform procedure. During the runs, an accurate check
can be made on the pressure gage reading which corresponds to 420° F, (should be 295
PSIG).
Each autoclave has been carefully tested before shipment. During testing, the regulator
was set to maintain an average pressure to 295 PSIG as indicated by the pressure gage.
It is possible, however, that the setting of the regulator may be altered in transit. The
need for readjustment will become apparent in the first trial run when the autoclave
assembly reaches equilibrium and the regulator makes and breaks the heating circuit
three or four times. The range adjustment screw should be gradually adjusted so that the
regulator opens the circuit (pilot light cuts off) when the pressure gage attains 295 PSIG.
Usually the regulator will close the circuit at 5 PSIG below 295, provided the differential
adjustment screw is turned clockwise as far as possible. The position of this screw
should be checked occasionally. The thermometer should also be checked to see that it
indicates temperature correctly at 420° F with the pressure gage reading of 295 PSIG.
4.2 Preliminary Adjustments
1) Clean and dry thoroughly the interior of the cylinder before adding any water. Put
600cc of distilled water in the cylinder.
2) Clean the gasket groove located inside the bolt circle of the cylinder flange. It is very
important that this groove not be scratched or otherwise marred during cleaning.
Coat both sides of a fresh gasket with a high temperature lubricant, such as dry
graphite, applied either by aerosol or brush.
The coating will reduce the adherence of the gasket.
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