5 Putting into operation
56
R-220 Pro Continuous Operation Manual, Version A
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!
X
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
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 flask
