Buchi Rotavapo R-220 SE User Manual download pdf (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.

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Buchi Rotavapo R-220 SE User Manual Page 72