C30HVRT Compressor Unit Instruction Manual
Connecting helium supply line and air purging procedures
1. Remove the front panel of the compressor.
2. Attach the pressure regulator to a helium bottle.
3. Purge the pressure regulator and helium charging hose.
3-1 Turn the pressure regulator handle in clockwise
(*1)
slowly until it is felt hit.
Then turn approximately 1/8 to 1/6 further to slightly open the pressure
regulator.
3-2 Slowly open the bottle valve, and confirm the helium gas is flowing out from the
pressure regulator exit. After confirming the gas flow, close the pressure
regulator by turning its handle counter-clockwise and then connect the helium
charging hose to the pressure regulator.
3-3 Turn the handle clockwise again and confirm the lower side pressure gauge
indicates 0.1MPaG to 0.2MPaG. At this time, helium gas is flowing out from
the flared fitting of the charging hose. Allow helium gas to flow for 30 seconds
to purge the charging hose of air.
(*1)
In general, a pressure regulator opens by turning its handle clockwise.
4. Purge the helium filling fitting of the compressor and connect the charging hose.
4-1 While doing the procedure in 3-3, open the helium filling valve slightly (turn it
counter-clockwise). Allow a small amount helium gas to flow through the
helium filling valve and the helium filling fitting to purge the air between them.
4-2 Connect the 1/4 inch female flare end of the charging hose to the helium filling
fitting of the compressor while the helium gas flows out from both the helium
filling fitting and the charging hose.
4-3 After connecting them, close the helium filling valve by turning its knob
clockwise.
Filling helium gas to the compressor
1. Turn the pressure regulator handle attached to the helium bottle clockwise and
adjust the pressure until the lower side pressure gauge shows 1.8MPaG.
2. Open the helium filling valve by turning its knob slowly counter-clockwise. At
the same time monitor the value indicated on the helium pressure gauge of the
compressor goes up slowly.
3. When helium pressure reaches the appropriate value, close the helium filling
valve by turning its knob clockwise.
4. Confirm that the valve is closed firmly. Turn the handle of the pressure
regulator counter-clockwise to stop the gas flow. Then disconnect the charging
hose from the helium filling fitting of the compressor.
5. Return the front panel of the compressor unit to the original position.
ULVAC CRYOGENICS INCORPORATED
7-9
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