Freeze-dryer Alpha 3-4 LSCbasic
7 Malfunctions and error correction
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Version 11/2018, Rev. 1.9 of 01/12/2021
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Translation of the original operating manuel
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7.1.2.2
Aeration valve, media drain valve
WARNING
Risk of poisoning/infection caused by contaminated condensate
(defrosting water)
The condensate may contain harmful substances originating from the
product.
Contact with the condensate may cause severe damage to health.
• Wear suitable protective clothes, gloves, and respiratory protection
when performing any work on the drain system (especially when
cleaning the valves and replacing the seals)!
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
• 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").
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7.1.2.3
Pressure control valve
A malfunction of the pressure control valve may have several causes.
NOTE
The inspection of the valve must be carried out by qualified specialist
personnel (see chapter 7.3 - "Service contact").
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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.
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7.1.2.5
Vacuum sensor
Vacuum sensors have a limited service life and can be ordered as spare
parts.
Capacitive vacuum sensors
Capacitive vacuum sensors may experience a measurement drift due to
long-term use, soiling or sudden aeration. In this case, the vacuum sensor
must be adjusted (see chapter 8.1.9 - " Vacuum sensor ").
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