Instruction Manual

ManualsBrandsMartin Christ ManualsEquipmentAlpha 1-2 LDplus

Freeze-dryer Alpha 1-2 LDplus

7 Malfunctions and error correction

Version 11/2006, Rev. 2.0 of 02/12/2014 • sb

Translation of the original operating manual

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 (e.g. VSP62/63, order no. 125468).

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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