Sumitomo SRDK Series - Shut-Down Operation

OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 39
3-3 SHUT DOWN
3-3 SHUT-DOWN OPERATION
<Warning about explosion, escape of gas>
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.
<Caution against misoperation>
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.
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.
Shut down operation for the Cryocooler as mentioned below;
1） Turn off the “Drive Switch”.
For Air Cooled Compressor Unit For Water Cooled Compressor Unit
2） Turn off the “Main Power Switch”.
For Air Cooled Compressor Unit For Water Cooled Compressor Unit
WARNING
CAUTION