Specifications

Operating Manual Freeze Dryer ALPHA 1-4 LD-2 / 2-4 LD-2, Version 0203, Page 41
Cleaning of accessories should be carried out away from the freeze dryer once a week
or preferably after every use. If there is the risk of toxic, radioactive or pathogenic
contamination, special safety measures must be considered and adhered to.
Aluminium accessories are particularly subject to corrosion. A neutral agent with a pH-
value between 6 and 8 should be used for such parts. Alkaline agents (pH > 8) must
be avoided. Thus life time is increased and corrosion is reduced considerably.
Careful maintenance through the user increases life time and avoids premature failure
of accessories. Damage caused by insufficient care does not constitute a warranty
claim.
6.7.3 Maintenance of the Condensate Drain Valve
Special attention must be paid to the condensate drain valve. If residues from previous
drying processes deposit on it, there is the risk of faulty operation of the freeze dryer.
Therefore, take care that no product or other residues will get into the pipe to the
condensate drain valve.
6.7.4 Disinfection of Chamber and Accessories
All usual disinfectants like e. g. INCIDUR, Melisiptol, Sagrotan, Buraton or Terralin
(available at laboratory retail suppliers) can be used.
NOTE! Check compatibility with lid; also see enclosure “Chemical properties of
PLEXIGLAS (acrylic glass).
The freeze dryers and the accessories consist of different materials. A possible
incompatibility must be considered. For autoclaving the temperature stability of the
individual material must be checked. Please consult us if in doubt. If dangerous
materials are used, the freeze dryer and the accessories must be disinfected.
6.7.5 Checks by Operator
The operator has to ensure that the important parts of the freeze dryer relevant for
safety are not damaged.
This especially refers to:
1. Acrylic lid or acrylic chamber
2. Seals
3. Oil level of vacuum pump
4. Accessories, especially changes like corrosion, cracks, wear and tear of material
etc.
Furthermore, an earth conductor check must be carried out regularly.