Maintenance
Switch off the compressor unit and separate it from
mains power supply before changing 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.
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. All the self-sealing couplings which
are not in use shall be provided with pro-
tective caps.
Observe the instructions for the work given in Section
2.6.
Unscrew the high-pressure flexline from the compressor
unit (19/7).
Remove the side panels (19/11).
Unscrew the mounting angle (19/12) and remove the
cover (19/1).
Lift off the foam rubber insert (19/2). If the insert should
remain inside the cover, then it need not be removed
from the cover.
Unscrew the 2 screws (19/10) (M6x16, wrench size 10
mm)
Detach the self-sealing coupling (19/8) and slide the
adsorber towards the operator side during the process.
Unscrew the nut (19/3) and remove the washer (19/4),
the fixing element (19/5), and the tooth lock washer
(19/6).
Tilt the adsorber and pull it out at the side. The high-pres-
sure helium connection is left on the adsorber.
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; 1.6 MPa).
Seal the old adsorber with the protective caps and for-
ward it to Leybold for reconditioning.
Warning
The adsorber may contain pressure of up to
16 bar (232 psig; 1.6 MPa) even after it is
removed from the system.
Reattach the high-pressure flexline to the compressor
unit.
33
GA 12.137/2.02 - 05/2002
4.3 Changing the fuses for
the control voltage
Warning
Separate the compressor unit from mains
power supply before beginning any work.
See Fig. 20.
Unscrew the 6 hex head screws that hold the power
module (8 mm key). Pull out the power module a little bit
and fold it down.
Unscrew the 3 nuts that hold the power module’s cover
(7 mm key) and remove the cover.
Change the fuses.
Caution
Replace fuses F4 and F5 only with the cor-
rect ones: 0.315 A T.
Remount the power module in reverse order.
4.4 Leybold service
If you send equipment to LEYBOLD indicate whether it is
free of substances damaging to health or whether it is
contaminated. If it is contaminated also indicate the
nature of hazard. To do so, you must use a preprinted
form which we shall send to you upon request.
A copy of this form is printed at the end of the Operating
Instructions: “Declaration of Contamination of Vacuum
Equipment and Components“.
Either fasten this form at the equipment or simply enclo-
se it with the equipment.
This declaration of contamination is necessary to com-
ply with legal requirements and to protect our staff.
LEYBOLD must return any equipment without a declara-
tion of contamination to the sender’s address.
