Operating Manual Freeze Dryer ALPHA 1-2 LDplus Maintenance • 57
7.3.2.2. Adjustment to a specific zero reference value
To perform this adjustment, the actual pressure must be lower
than 1.0x10
-2
mbar. After pressing of the button labelled “set”, the
actual vacuum field of the LDplus control system shows a value
corresponding to the zero adjustment value currently set (factory
setting 0.0010 mbar). The button labelled “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 0.0010 mbar. When the zero
adjustment value is adapted to the applied zero reference value,
the new zero reference value will be saved automatically and
without any other key depression after 5 seconds and the
adjustment will be performed. If from now on the "adj" button is
pressed at zero pressure, the system will be adjusted to the zero
adjustment value set.
If “set” is entered without any other key depression, the zero
adjustment value will be shown in a purely informative manner for
5 seconds, but no adjustment 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 maintenance of the vacuum pump please refer to the separate
operating manual.
Additionally, we would like to emphasise the following points:
The oil level of the vacuum pump must be regularly checked using
the inspection 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.
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.
7.6. Exhaust Filter
If the unit is equipped with an exhaust filter (necessary if the
exhaust gases cannot be extracted into the open air or into a vent)
take care that the condensate in the filter does not rise too high.
The condensate is drained using a waste oil drain screw at the
filter.
(Please refer to separate operating manual!)
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