OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 40
3-4 NORMAL OPERATION
3-4 NORMAL OPERATION
<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.
“IMPOTANT”
If the compressor unit used is the CSA-71A (air cooled, low voltage type), note that the noise level of the
whole equipment may exceed 70 dBA depending on the environment it is used in.
EXHAUST SOUND
Starting Cryocooler, you can hear the gas inlet/outlet sound from the Cold Head. The sound of the
Cold Head is 60 rpm at 50 Hz and 72 rpm at 60 Hz respectively. During this checking, the Compressor
operating pressure will be around 2.5 MPa (25.5 kgf/cm
2
G, 362 psig).
SUPPLY PRESSURE INDICATION
Monitor the compressor's supply He gas pressure. In the normal operation with adequate heat loads,
the supply helium gas pressure indicates between 2.1 and 2.3 MPa (21.4 and 23.5 kgf/cm
2
G, 304 and
333 psig). The operating pressure varies according to the heat load of cold head and temperature
around the equipment.
COLD STAGE TEMPERATURE
Monitor the Cold Head 1st and 2nd stage temperature. The final temperature of the Cold Head
depends on the heat load such as radiation heat, applied heat load and convection caused by bad
vacuum of the chamber. If the temperature becomes steady state but high, the total heat loads to the
Cold Head is too much. Check the heat loads.
FLEX LINES TEMPERATURE
Make sure that the temperature of the supply Flex Line from the Compressor to the Cold Head does not
exceed 40 deg.C (104 deg.F). If the Flex Line temperature is higher, check the conditions of air flow
and cooler fins for Air Cooled Compressor Unit, and water flow for Water Cooled Compressor Unit.
COOLING AIR FLOW (for Air Cooled Compressor Unit)
If the system is with Air-Cooled Compressor Unit, identify that the forced draught Fan located at the top
of the Compressor Unit is continuously operating and that cooling air is drawn in through the heat
exchanger and flows out from the top cover of the Compressor Unit. It is required to keep the enough
space around the compressor and the room temperature should be less than 28 deg.C (82.4 deg.F)to
get the refrigeration capacity. The maximum heat output from Compressor is 8.3 kW or 28,320 BTU/h,
therefore, a suitable air-conditioning should be prepared.
COOLING WATER FLOW (for Water Cooled Compressor Unit)
If the system is with Water-Cooled Compressor Unit, make sure that the sufficient cooling water is
flowing as shown in the specification described in “TECHNICAL INSTRUCTION” of Compressor Unit
used. The quality of the water should meet the specification (The specification is also described in
“TECHNICAL INSTRUCTION” of Compressor Unit used.) to prevent plugging or calcification.
WARNING
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