OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 47
5-4 HELIUM GAS CHARGING
PROCEDURE
1） Remove the protective cap from the gas charge coupling on the Compressor Unit. Connect a
pressure regulator and charging line to a helium bottle (purity 99.999% up). Connect a gas charging
tool to the Compressor Unit after closing the valve of gas charging tool.
2） Open the valve of pressure regulator slightly and slowly. Purge a Helium Gas for about 30 seconds
to vent the contamination in the charging line. Reduce the helium gas flow by controlling the valve of
pressure regulator and keep the slight helium gas flow.
3） Purge the air in the gas charging tool for about 5 seconds by opening the valve of gas charging tool.
Reduce the helium gas flow by controlling the valve of gas charging tool and keep the slight helium
gas flow.
4） Connect a charging line to a gas charging tool. Shut the valve of gas charging tool immediately.
5） Set the pressure regulator around 1.65 - 1.70 MPa (16.8 - 17.3 kgf/cm
2
G, 239 - 246 psig).
6） Open the valve of gas charging tool slightly and slowly. Charge Helium gas till the pressure gauge of
the Compressor Unit indicates specified filling pressure and shut the valve. See “TECHNICAL
INSTRUCTION” for more detail of the pressure, Cold Head used.
COLD HEAD MODEL STATIC PRESSURE
RDK-408D2 4K Cold Head
RDK-408D 4K Cold Head
RDK-415D 4K Cold Head
1.60 - 1.70 MPa at 20 deg.C (68 deg.F)
(16.3 - 17.3 kgf/cm
2
G, 232 - 246 psig)
RDK-408S2 10K Cold Head
RDK-408S 10K Cold Head
RDK-400B Single Stage Cold Head
1.45 - 1.55 MPa at 20 deg.C (68 deg.F)
(14.8 - 15.8 kgf/cm
2
G, 210 - 225 psig)
7） Shut the valve of gas charging tool and pressure regulator. Disconnect the charging line and gas
charging tool from the Compressor Unit.
8） Set the protective cap to gas charge coupling on the Compressor Unit.
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