7 Maintenance and repairs
45 K-425 / K-436 Operation Manual, Version B
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.
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