Section 7 Maintenance
7-6
ULVAC CRYOGENICS INCORPORATED
The following describes how to adjust the helium pressure.
(1) Reducing helium pressure
1. Using an appropriate screw driver, unscrew the six screws at the front panel of the
compressor and remove the panel (See Figure 7-8).
2. Open the Helium fill valve inside the compressor slowly by turning its knob
counter-clockwise. Allow a slight amount of helium gas to escape.
3. Wait until the helium pressure gauge reads the appropriate value described above.
When the pressure reaches the desired value, close the valve by turning its knob
clockwise.
4. Attach the front panel of the compressor with the six screws removed in the above
step.
Immediately after the compressor is shut down, some areas inside may remain hot. Wait at
least 15 minutes until it cools down to conduct the work safely. Failure to observe this
warning may result in severe bodily injury.
re adjustment must be done when the equipment inside the compressor are at room
Wait for about three hours until it cools down before performing this work.
WARNING
Pressu
temperature.
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