Compressor Unit Instruction Manual
ULVAC CRYOGENICS INCORPORATED 6-3
6.3 Charging Helium Gas
Please supply the equipments for charging helium gas (regulators, charging hoses,
adopters) that can be used at 2.0MPaG or above. ve.
If the helium pressure gauge of the compressor unit shows 0 MPaG, contamination caused
by air or moisture may occur in the system. If it occurs, contact our Service Engineering
Division or customer support center.
If the helium pressure gauge of the compressor unit shows 0 MPaG, contamination caused
by air or moisture may occur in the system. If it occurs, contact our Service Engineering
Division or customer support center.
When helium gas pressure is lowered, it is necessary to replenish the gas. Investigate
the cause of the pressure reduction bef lium gas. If there is a leakage, take
an adequate measure before charging. Improperly connected self-sealing coupling might
be one of the causes of the leakage.
When helium gas pressure is lowered, it is necessary to replenish the gas. Investigate
the cause of the pressure reduction before adding helium gas. If there is a leakage, take
an adequate measure before charging. Improperly connected self-sealing coupling might
be one of the causes of the leakage.
ore adding he
◇It is recommended to use the regulator which shows the range of 4〜6 MPaG as outlet
pressure.
◇It is recommended to use the regulator which shows the range of 4〜6 MPaG as outlet
pressure.
◇The gas charge inlet of the compressor unit is 1/4B male flare. ◇The gas charge inlet of the compressor unit is 1/4B male flare.
◇Use helium gas with purity of 99.999% or more. ◇Use helium gas with purity of 99.999% or more.
The filling method of helium gas is as follows: The filling method of helium gas is as follows:
１．When mounting the regulator on a new helium bottle, perform the following
procedures in order to purge the air and fill helium gas in the gas line between the
regulator and the bottle valve.
１．When mounting the regulator on a new helium bottle, perform the following
procedures in order to purge the air and fill helium gas in the gas line between the
regulator and the bottle valve.
ａ．Open the regulator a little. The regulator can be opened commonly by turning the
handle clockwise.
ａ．Open the regulator a little. The regulator can be opened commonly by turning the
handle clockwise.
ｂ．Slowly open the bottle valve, and purge the air in the gas line for several seconds. ｂ．Slowly open the bottle valve, and purge the air in the gas line for several seconds.
ｃ．Close the regulator. ｃ．Close the regulator.
If the bottle valve is opened ignoring the above procedures (1), the air between the regulator
and the bottle valve diffuses into the helium bottle and lowers the purity of helium gas.
If the bottle valve is opened ignoring the above procedures (1), the air between the regulator
and the bottle valve diffuses into the helium bottle and lowers the purity of helium gas.
２．Remove the front panel of the compressor unit. ２．Remove the front panel of the compressor unit.
３．Connect the helium charging hose as follows: ３．Connect the helium charging hose as follows:
ａ．Connect the charging hose to the ａ．Connect the charging hose to the regulator. regulator.
ｂ．Loosely connect the charging hose to the charge inlet on the compressor unit so
that helium gas can be slightly blown out here.
ｂ．Loosely connect the charging hose to the charge inlet on the compressor unit so
that helium gas can be slightly blown out here.
ｃ．Open the regulator until the outlet pressure reaches 0.1 to 0.2 MPaG. Allow ｃ．Open the regulator until the outlet pressure reaches 0.1 to 0.2 MPaG. Allow
CAUTION
CAUTION
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