BUCHI Rotavapo R-220 SE - Manual (Page 72)

7 Maintenance and repairs
72 R-220 SE Operation Manual, Version F
7 .2 Regular service and checks
To maintain the system in good working order the checks described in this section should be
performed regularly. Defective or worn out parts must be exchanged directly to ensure safe use and
optimal efficiency.
7 .2 .1 System tightness
To evaluate the system tightness, evacuate the unit to below 100 mbar and then close the vacuum
line. The rate of pressure rise must not exceed 1 mbar per minute.
A greater pressure rise indicates a leakage. In such a case, recheck all EasyClamp connections, seal
rings and valves for proper seating.
7 .2 .2 Sealings and hoses
Check for wear and clean the vacuum seal at least every six months.
Check all other seals and hoses for wear at least yearly.
➡ Exchange seals with scratches or other harms directly.
NOTE
• To prevent damaging the seals never apply grease or touch them with sharp objects.
• To prolong the lifetime of the seals, rinse them routinely with water or ethanol to remove possible
contamination with sample material.
• Dry the cleaned seals with a soft, lint-free cloth.
• PTFE seals need a 10 hours run-in period to reach their optimum tightness condition. This is
normal for a PTFE seal.
7 .2 .3 Glassware and clamps
Clean all glass components after a distillation process to prevent cross-contamination.
• Inner surfaces
➥ Cleaning can be done by distillation of ethanol or acetone (product residues must be soluble by
the distilled cleaning agent).
• Outer surfaces
➥ Cleaning of outer parts can be done manually with warm water and a commercial cleaning
agent (e.g. mild soap solution).
• Smaller parts such as clamps can be cleaned in an ultrasonic bath.
➡ Visually check all glass components and clamps for damages subsequently.
NOTE
• It is recommended to decalcify the cooler spiral regularly to prevent calcification.
• Regularly flush the cooling spiral with cleaning detergent to remove algae.
7 .2 .4 Housing, heating bath, cables and accessories
Check the housing, cables and accessories for visible defects (cracks, kinks etc.). Clean housing
parts regularly with a damp cloth. Soapy water can be used as cleaning agent.