Technical data

Calibration to a specific zero reference value:
To perform the calibration, the actual pressure must be lower than
1.0x10
-2
mbar. After pressing of the button labeled “set”, the actual
vacuum field of the LSC control system shows a value
corresponding to the zero adjustment value currently set (factory
setting 0.0010 mbar). The button labeled “adj” can now be used to
increment this value up to a maximum of 1.0x10
-2
mbar. As of this
value, the output starts again at 0.0010mbar. When the zero
calibration value is adapted to the applied zero reference value,
the new zero reference value will be saved automatically after 5
seconds if no key is pressed and the calibration will be performed.
If from now on the “adj” button is pressed at zero pressure, the
system will be calibrated to the set zero calibration value.
If “set” is entered without any other key depression, the zero
calibration value will be shown in a purely informative manner for 5
seconds, but no calibration will be performed.
7.4. Rubber valves
Special attention must be paid to the rubber valves. If the valves
are stiff, they must be dismantled, cleaned, slightly greased with
vacuum grease and reassembled.
7.5. Vacuum pump
For the maintenance of the vacuum pump, please refer to the
separate operating manual.
Additionally, we would like to emphasize the following points:
The oil level of the vacuum pump must be regularly checked at the
sight glass (in case of continuous operation at least once a week).
Top up oil to the required level via the oil inlet. Due to the
continuous operation with gas ballast, oil consumption cannot be
avoided. For topping-up see the operating manual of the pump.
Since spring 2004, most of the vacuum pumps delivered by
CHRIST have been equipped with an automatic oil recirculation
system. This system reuses the oil separated by the exhaust filter
to feed the pump. A manual removal is no longer necessary.
The first oil change must be carried out after approx. 100 operating
hours. Subsequent oil change intervals depend on the operating
conditions. In general, an oil change is necessary after approx.
500 to 1000 operating hours.
The oil change should always be carried out with warm pump.
Operating Manual Freeze Dryer ALPHA 1-4 LSC / ALPHA 2-4 LSC Maintenance • 83