OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 43
5-1 GENERAL INFORMATION FOR THE MAINTENANCE
5 MAINTENANCE
<Warning about electric shock>
This cryocooler includes a high-voltage section. Touching it may result in electric shock.
Handle it with extreme care.
Make sure no power is applied to the compressor unit before connecting or disconnecting the
cold head power cable. Failing to observe this precaution may result in electric shock.
Be sure to turn off and Lock Out with OFF position the main power of the customer's power
source before connecting or disconnecting the input power cable to the Compressor Unit, and
then remove the input power cable from the main power. Failing to observe this precaution
may result in electric shock.
Do not change the setting of the dial above the main power switch of the compressor unit under
any circumstances. Failing to observe this precaution may result in electric shock.
Be sure to turn off and Lock Out with OFF position the customer's main power before performing
maintenance work such as replacement of fuses. Failing to observe this precaution may result
in electric shock.
<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.
Do not disassemble the equipment for purposes other than maintenance specified in this
service manual under any circumstances. Disassembling the equipment may result in electric
shock, explosion or escape of gas.
The cold head, compressor unit, compressor adsorber and flex lines are pressurized with helium
gas. Purge the helium gas from all pressurized components before disposing. Open the
purging valve gradually or it may result in serious injury.
Do not break the vacuum with the low temperature of cold head second stage when removing
the cold head from the vacuum chamber. Breaking the vacuum may result in serious damage,
explosion or escape of gas. Keep the Flex Lines connected and maintain the high vacuum of
the chamber and wait until the cold head second stage temperature rises up to 100K before
removing the cold head.
<Warning about rotating part>
If the compressor unit used is the CSA-71A (air cooled, low voltage type), a venting fan is
provided in the exhaust section at the top of the compressor unit. Do not insert foreign
substances from the exhaust port under any circumstances. Failing to observe this precaution
may result in injury or malfunction.
The Adsorber weight is about 11.0kg. When replace the adsorber, be careful of handling so that
it may not get hurt.
WARNING
WARNING
WARNING
WARNING
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