BUCHI SpeedDigester K-439 - Manual (Page 54)

7 Maintenance and repairs
54 K-439 Operation Manual, Version A
the possibility of unwanted sample contamination (foaming or boiling retardation). Afterwards dry the
cleaned seals with a soft cloth.
7 .5 Rack system
To prolong the lifetime of the racks, rinse them with water thoroughly to remove possible acid resi-
dues. Subsequently, clean the racks with non-abrasive cleaning agents (e.g. soapy water).
7 .5 .1 300 ml sample tube support spring
The 300 ml tube rack is equipped with six sample tube support assemblies. Each assembly includes
a circular spring and a black plastic retaining ring with notches. Three of six notches are equipped
with small brackets — to release the spring gently squeeze the retaining ring and lift it off the rack. For
installation simply push the ring and spring assembly in.
Note
Keep the springs clean to avoid corrosion. •
Regularly check the spring force for signs of wearing. Inserted glasses must not squeeze the •
spring assembly significantly.
Exchange 'Set circular spring and holder' (order no. 11055984) in case of leakages between
•
sample tube and suction module.