Freeze-dryer Alpha 1-4 LSCplus
Freeze-dryer Alpha 2-4 LSCplus
7 Malfunctions and error correction
Version 01/2011, Rev. 2.3 of 03/07/2017 • sb
Translation of the original operating manual
7.1.2.2 Aeration valve, media drain valve
A malfunction of the aeration valve or the media drain valve may have
several causes. One potential source are contaminants such as product
residues within the valve.
• Switch the freeze-dryer off and disconnect the mains plug.
• Clean the valve (see chapter 8.1.3 - "Aeration valve, media drain
valve").
• Put the freeze-dryer into operation again.
If there is still a leakage, the freeze-dryer must be checked by qualified
specialist personnel (see chapter 7.3 - "Service contact").
7.1.2.3 Pressure control valve
A malfunction of the pressure control valve may have several causes.
The inspection of the valve must be carried out by qualified specialist
personnel (see chapter 7.3 - "Service contact").
7.1.2.4 Rubber valves
In order to identify a leaking rubber valve, the valves must be checked
individually:
• Remove the rubber valve and seal the connection at the drying
chamber with a rubber stopper.
• Check the tightness under vacuum until the leaking valve has been
localised.
• Clean the valve or replace it if necessary.
7.1.2.5 Vacuum sensor
Vacuum sensors have a limited service life and can be ordered as spare
parts (e.g. VCP 63, order no. 312011).
Functional test:
• Connect the vacuum sensor directly to the suction side connector of the
vacuum pump.
If a final pressure of at least 0.011 mbar is reached (with a vacuum pump
that has reached its operating temperature), the sensor and the vacuum
pump are OK.
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