BUCHI Rotavapo R-220 SE - Manual (Page 64)

5 Putting into operation
64 R-220 SE Operation Manual, Version F
NOTICE
Risk of instrument damage by wrong mains supply.
• External mains supply must meet the voltage given on the type plate
• Check for sufficient grounding
5 .18 Adjusting the snap flange
System tightness is essential when working with a Rotavapor. Thus, the snap flange assembly should
be checked at every evaporating flask installation. This is necessary since every glassware has its
unique fitting accuracy.
Clockwise = increasing the tension
Counterclockwise = decreasing the tension
• When passing the top dead center of the closing mechanism a clear resistance must be felt.
• Moving the lever must never require excessive force!
➡ If the required lever force is too weak the flange may not be thight and will wear out the PTFE seal.
In this case, increase the tension of the closure.
➡ If the required lever force is too high (e.g. the lever can not be shifted over the top dead center)
reduce the tension of the closure.