5 Putting into operation
56 R-220 Pro Continuous Operation Manual, Version A
5.18 Adjusting the snap ange
System tightness is essential when working with a Rotavapor
®
. Thus, the snap ange assembly should
be checked at every evaporating ask installation. This is necessary since every glassware has its
unique tting 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!
X If the required lever force is too weak the ange may not be thight and will wear out the PTFE
seal. In this case, increase the tension of the closure.
X 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.
After readjustment, perform a vacuum test-run without heating bath and sample medium.
NOTE
Perform the adjustment in single-turn steps only. Inbetween, check for proper tension with the empty
evaporating ask.
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