Martin Christ Beta 2-8 LDplus - Manual (Page 56)

56 Error Correction Operating Manual Freeze Dryer BETA 1-8 LDplus / BETA 2-8 LDplus
Check if the whole surface of the ground-in socket of the
mountable drying chamber has been greased evenly and
completely with vacuum grease.
When using drying chambers with several connections for rubber
valves the valves should be taken off and the connections should
be sealed with rubber stoppers. To check the valves they are
connected one after the other and tested under vacuum.
Check the vacuum sensor for pollution such as water residue.
The vacuum sensor has a limited life time due to its design
principle (see also chapter 7.3.1). Vacuum sensors are available
as a spare part.
Check the vacuum display with a suitable testing unit (if available).
In order to locate a possible leak we recommend that the vacuum
measuring sensor is directly connected to the vacuum flange of
the vacuum pump. If the warm vacuum pump reaches a final
pressure of at least 0.011 mbar, the vacuum pump and the
measuring system can be presumed to be in working order. There
is probably a leak in the unit if insufficient vacuum is not caused by
an insufficient ice condenser temperature.
Check the oil level in the vacuum pump, change oil if dirty, and
carry out a pressure test.
If the above-mentioned steps show no result, the next step is to
check all small flange connections (see chapter 4.7.2) and
especially the position of the centring rings. It is usually not
necessary to grease the sealing rings with high vacuum grease.
The vacuum pump does not switch on:
The vacuum pump is equipped with a protective switch for the
drive motor.
Please refer to separate operating manual.
General information:
The vacuum checks should be carried out when the ice condenser
is deep-frozen.