Heidolph LABOROTA 20 automatic - Manual (Page 110)

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33. Distillation cycle
Distilling off, Distilling LED will light; feeding product is confirmed by the Refilling LED.
34. End of product metering
Product tank empty, a product sensor will trigger a solenoid valve in the product feed line.
From this moment on, the product can be distilled to whatever degree, as requested by the
user.
35. End of distillation
When reaching concentration wanted, distillation needs to be discontinued. Distillation is
discontinued by one of the three methods, as stipulated below:
35.1. Manual
Hit Auto Start Stop key to run the following actions:

descend lift

rotation OFF

heater OFF

Aerating valve OPEN, vacuum control OFF and vacuum pump OFF.

Product feed and condensate discharge is cancelled
35.2. Timer
At the end of a certain period of time, as set with the timer before, the following actions are
taken:

descend lift

rotation OFF

heater OFF

Aerating valve OPEN, vacuum control OFF and vacuum pump OFF.

Product feed and condensate discharge is cancelled

buzzer sounds for about 10 seconds
35.3. Termination by using final pressure EndP (only Mode T auto)
If final pressure End P is reached distillation is terminated with following action:

descend lift

rotation OFF

heater OFF

Aerating valve OPEN, vacuum control OFF and vacuum pump OFF.

Product feed and condensate discharge is cancelled
36. Flush vacuum pump
At the end of a shift, we recommend to flush your vacuum pump with air. This way, solvent
residues are removed from pump body and valve area. This way, valves remain clear and
won't get stuck.