OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 46
5-4 HELIUM GAS CHARGING
5-4 HELIUM GAS CHARGING
<Warning about explosion, escape of gas>
This cryocooler (cold head, compressor unit, compressor adsorber, flex lines) contains a high-
pressure (about 1.62 MPa (16.5 kgf/cm
2
G, 235 psig)) helium gas sealed in. Hitting the
equipment with a sharp edge or touching it with a pointed object may cause explosion or escape
of gas. Handle the equipment with extreme care.
<Caution against misoperation>
Pay attention to the contamination when charging a helium gas. The contamination may result in
occurrence of the noise from the Cold Head or decreasing the cooling capacity.
“IMPORTANT”
The filling pressure of the cryocooler varies in accordance with the compressor and coldhead
temperature. Make sure the cryocooler is powered off and compressor and coldhead temperatures are
almost same as room temperature before adjusting the helium gas pressure.
Charge helium gas, if the pressure indication of the Compressor Unit is lower than specified value.
After stopping the cryocooler, the pressure indication on the Indoor Unit pressure gauge shows lower than
actual filling pressure, because of the low temperature of the coldhead. The coldhead temperature and
compressor unit temperature needs to be equal to ambient temperature to check the actual filling
pressure.
The filling pressure indication depends on the temperature of cryocooler components, such as Coldhead,
Outdoor Unit, Indoor Unit and Flex Lines. In case the room temperature is relatively low, the filling pressure
indicates lower. In case the room temperature is relatively high, the filling pressure indicates higher.
Refer to the ambient temperature to adjust the filling pressure precisely.
REQUIRED TOOLS
The following tools are required to charge helium gas to the Cryocooler system.
Table 5.2 REQUIRED TOOLS FOR HELIUM GAS CHARGE
TOOLS REMARK
1 Gas charging tool for the Compressor Unit.
2 3/4“ Open-end wrench.
3 5/8“ Open-end wrench.
4 Pressure regulator for helium gas bottle
5 Helium gas bottle Purity of 99.999% up
WARNING
CAUTION
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