OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 6
SAFETY PRECAUTIONS
“CAUTIONS”
<Caution against misoperation>
Do not tilt it by more than 30 degrees when carrying the compressor unit. Tilting it by more than 30 degrees
may cause oil sealed in the unit to move, preventing the cryocooler from operating normally.
This cryocooler is intended for the exclusive use indoors. It cannot be used outdoors. Failing to observe
this precaution may prevent the cryocooler from operating normally.
Do not use inverter for the main power source of the compressor unit. Operating with inverter may result in
the damage or malfunction of the compressor electric circuit.
Avoid using the transformer for the main power source of the compressor unit. If the transformer is
installed at the upstream of the unit, lacking phase protection circuit with the cryocooler occurs in a
malfunction. That may result in misoperation or malfunction. When using the transformer, install the other
lacking phase protection device in upstream of the transformer.
The cryocooler ON/OFF frequency must be less than 6 times per hour, and the
ON/OFF interval must be
more than 3 minutes. The frequent ON/OFF operation may result in damage of compressor capsule or
malfunction.
Do not get on the compressor unit or put an object on top of it. Failing to observe this precaution may
prevent the cryocooler from operating normally or cause injury.
Secure enough space around the compressor unit for heat radiation and maintenance. Failing to secure
enough space may result in misoperation or malfunction. (See the technical instruction of the compressor
unit used, for details.)
If the compressor unit used is the CSA-71A (air cooled, low voltage type), sufficient space is required for
venting. Failing to secure sufficient space may result in misoperation or malfunction. (See the CSA-71A
technical instruction, for details.)
If the compressor unit used is the CSA-71A (air cooled, low voltage type), it should be installed in a clean
environment. Installing it in a dusty environment such as inside a factory will require frequent cleaning of
the cooler fins or may result in misoperation or malfunction.
If the compressor unit used is a water-cooled type (CSW-71C, CSW-71D), use cooling water with
appropriate temperature, flow rate and water quality. Using inappropriate cooling water may result in
misoperation or malfunction. (See the technical instruction of the compressor unit used, for details.)
If the compressor unit used is a water-cooled type (CSW-71C, CSW-71D), do not use the demineralized
water for cooling water. Using demineralized water for cooling water may result in water leakage or
malfunction.
Be extremely careful not to damage the cylinder when mounting the cold head. Damaging the cylinder may
result in misoperation or malfunction.
Be sure to check the flat rubber gasket of the self seal coupling of the cold head and compressor unit for dirt,
dust or to see whether the flat rubber gasket is attached correctly, before connecting the flex lines.
Connecting the flex lines with an abnormal flat rubber gasket setting may cause escape of gas.
When connecting the flex lines to the cold head, be sure to start with the flex line on the "Return" side.
Starting with the flex line on the "Supply" side may cause misoperation.
This cryocooler (cold head, compressor unit,
compressor adsorber, flex lines) is shipped with a helium gas
at about 1.62 MPa (16.5 kgf/cm
2
G, 235 psig) sealed in. Be sure to adjust the pressure to an appropriate
value according to the cold head used before operating the equipment. Using the cryocooler at an improper
pressure may cause misoperation.
The cold head drive switch provided with the compressor unit is only used for maintenance. Be sure to turn
it OFF in normal operation. Using the compressor unit with the cold head drive switch turned ON may result
in misoperation or malfunction.
The coldhead employs the special seal to the 2nd stage. The 2nd stage displacer is fit tightly in the cylinder.
Make sure the 2nd stage temperature is less than 28 deg.C before starting up the cryocooler, or the
coldhead may make grinding noise.
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.
CAUTION
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