CTI-CRYOGENICS
HELIX TECHNOLOGY CORPORATION
3.4 Normal Operation
The components of the cryodyne cryocooler are
designed to operate without operator assistance. During
the first 100 hours of operation a slight drop in
compressor pump oil level may occur, but a drop is of no
concern as long as the oil level is visible. If oil level is
not visible, contact the Product Service Department.
The helium return pressure gauge should be checked
once a week and the reading noted in the operating log.
If the gauge reading falls outside the satisfactory
operating range as specified in your compressor manual,
refer to Section 5, Troubleshooting Procedures.
CAUTION
Never exceed operating compressor return pressure
higher than the value specified for your compressor.
Compressor damage can occur.
3.5 Shutdown Procedures
1.
Close the Hi-Vac valve between the cold head and
its vacuum chamber.
2.
Turn off the system power ON/OFF switch on the
compressor to shut down the compressor and cold
heads. If you desire to individually shut down a
cold head, a remote switching circuit should be
installed. Contact the Product Service Department
for assistance.
3.
It will take many hours to warm the cold head
cylinder to ambient temperature with no heat load
present. If a rapid warm-up is desired, break the
vacuum with a clean, dry gas, such as nitrogen or
argon. If this method is used, leave the valve open
to allow the expanding gas to escape as the cylinder
warms.
3.6 Storage
The cryocooler is fully protected during storage if kept
under positive helium pressure and all components left
connected. Periodically check the helium return pressure
gauge on the compressor. If the gauge reads below the
specified value in your compressor manual, add helium
as described in Section 6.2.
If the cold head is removed from your vacuum system,
be careful not to damage the cold head cylinder and
sealing surfaces.
3-2
P/N 8040272
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