18
Startup
KNAUER
Degasser 20DG User Manual V7632A, Version 1.1
Leak Test
The vacuum is continuously checked by means of a built-in
microprocessor and the pump output is adjusted. This can be
used to detect leaks.
Procedure in the event
of a detected leak
If a leak is detected, the microprocessor of the degasser auto-
matically increases the pump speed to maintain the vacuum.
If it is not possible to achieve the required vacuum within
30 minutes by means of the increased pump output, the INIT
LED lights up at the degasser to indicate that there is possibly
a leak in the system.
The degasser is automatically switched off and goes into
“safety mode”.
Switching Off the Degasser
Here a differentiation is made between short-term and long-
term switch-off.
Short-Term Switch-Off
CAUTION! Damage to the degasser caused by
buffer solutions.
Do not use buffer solutions when using a degas-
ser.
Procedure
1. Remove critical solvent from the degassing chambers and
other system components by flushing for example with
isopropanol (2-propanol).
2. Subsequently flush with water.
3. Connect the capillary of the pump outlet directly with a
waste container.
4. If the degasser is switched off for several days (e.g. over the
weekend), flush the device with methanol water (60:40) prior
to ending operation.
5. Switch off the degasser.
Note
Damage to the degasser that results from using buffer contain-
ing solvents are not covered by the warranty.
