Sumitomo SRDK Series - WARNING about explosion, escape of gas

OPERATION MANUAL Sumitomo Heavy Industries, Ltd.
SRDK Series CRYOCOOLER 5
SAFETY PRECAUTIONS
<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.
The minimum bending radius of the flex lines is 300 mm (11. 81 inches). Bending the flex lines at a smaller
angle may cause explosion or escape of gas, and so this should be avoided.
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.
Do not touch the cooler fin of the Compressor Unit during fin cleaning. Touching the fin may cause the injury.
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