GA 12.107/5.02 - 12/97
OUTLET
INLET
COOLING
WATER
LOW PRESSURE
HIGH PRESSURE
L E Y B O L D
20
Warning
Detaching the flexlines with the cold head at
low temperature can, when they heat up,
result in a rise in pressure beyond the per-
missible 28 bar (406 psig) operating pres-
sure for the disconnected flexline. All the
self-sealing couplings which are not in use
shall be provided with protective caps.
Observe the instructions for the work given in Section
2.6.
Unscrew the high-pressure flexline from the compressor
unit (11/3).
Loosen the nut (11/5) with a 13-mm open-end wrench.
Use the assembly wrench supplied to detach the self-
sealing coupling (11/2).
Remove the adsorber (11/4).
Remove the protective caps from the new adsorber and
install the new adsorber in reverse order.
The new adsorber is filled with helium of highest purity to
a level of 16 bar (232 psig).
Maintenance
Key to Fig. 11
1
Helium filling and discharge
connection
2
Self-sealing coupling
3
High-pressure helium connection
4
Adsorber
5
Nut (behind the base plate)
Fig. 11 Maintenance
4.2 Replacing the Adsorber
The adsorber is provided to keep the oil vapor out of the
flow of helium gas. It will have to be replaced after about
18,000 hours of operation. Otherwise oil can collect in
the cold head as a result of incomplete adsorption of the
oil vapors. This will cause a reduction in cooling perform-
ance; extreme contamination of the helium gas may
cause the cold head to cease functioning entirely.
Caution
When making this replacement use only the
appropriate adsorber supplied by Leybold;
refer to Section 1.4.
Switch off the compressor unit in preparation for re-
placing the adsorber.
Allow the cold head to warm up before disconnecting the
flexlines.
Detaching the flexlines with the cold head at low tempe-
rature can cause a loss of helium.
1
2
3
4
5
Summary of Contents for RW 6000-1
Page 23: ...GA 12 107 5 02 12 97 Notes 23...
