Specifications

Operating Manual Freeze Dryer ALPHA 1-4 LD-2 / 2-4 LD-2, Version 0203, Page 40
"HV" Adjustment:
The high-vacuum adjustment must be carried out with a two-stage slide vane rotary
vacuum pump in good working order:
− Mount the TPR 265 on the vacuum pump and evacuate for approx. 10 minutes.
− Set the transition point in the vacuum display of ALPHA 1-4 LD-2 / ALPHA 2-4 LD-
2 between 0.0026 mbar and 0.0030 mbar using the potentiometer "HV" of the TPR
265.
Vent the unit slowly and carry out the adjustment process once again.
If problems arise during the adjustment process of the vacuum measuring sensor, the
vacuum sensor must be sent to Christ to be checked. The vacuum measuring sensor
has a limited life time. Defective sensors are exchanged.
6.7 Cleaning
6.7.1 Cleaning of the Freeze Dryer
Use soap water or other water-soluble, mild agents for cleaning of the freeze dryer.
Avoid corrosive and aggressive substances. Do not use alkaline solutions or solvents
or agents with abrasive particles. Remove product residues from the chamber using a
cloth. It is recommended that the lid to the freeze dryer is left open when the freeze
dryer is not in use so that moisture can evaporate. If there is the risk of toxic,
radioactive or pathogenic contamination, special safety measures must be
considered and adhered to.
6.7.2 Cleaning of Accessories
When looking after accessories special safety measures must be considered as these
are measures to ensure operational safety and reliability.
Chemical reactions as well as stress corrosion cracking (combination of changing
pressure and chemical reaction) can affect or destroy the structure of the metals and
plastic parts. Hardly detectable cracks on the surface expand and weaken the material
without visible signs. When visible damage of the surface, a crack, a mark or any other
change, as well as corrosion is detected, the part in question (shelf, vessel, drying
chamber etc.) must be replaced immediately for safety reasons.
Fans, lid seal, vessels, racks, acrylic chamber and shelves must be cleaned regularly
In order to avoid damage.