Heidolph LABOROTA 20 compact and safety - Manual (Page 90)

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18. Timer
The timer function allows to end distillation after a
preselected period of time has expired. After the time has
elapsed, the following actions will be taken:

Lift DOWN

Rotation OFF

Heater OFF

Vacuum OFF

Buzzer sounds for 5 seconds
Turn timer ON and start
Select Timer with Select key.
Set hours and minutes with Set keys.
Start timer with Start Stop key, Timer LED flashes
Time remaining appears in display
Turn timer ON and start, after having started with Auto Start Stop before
Pressing Start Stop Timer, Set Timer LED illuminates.
For more settings refer to above paragraph.
19. Safety cut-out in an overpressure situation
The LABOROTA 20 control has been designed for distillation under vacuum. All of its gaskets and
seals have been optimzed for this vacuum atmosphere.
In particular situations, i.e. distillation in absence of a vacuum pump (e.g. low boiling substances),
overpressure may build-up in the glassware kit. Please understand that our sealing system has not
been designed for such overpressure situations.
In adverse overpressure situations, solvent may get into the drive module and hence damage
bearings. As a safety precaution, when distilling in absence of vacuum, make sure to keep the
aerating valve and valve (3) of the inlet pipe (2) open (also refer to "SET-UP", Chapter 8 page 74).
Moreover LABOROTA 20 control features an electronic overpressure monitoring circuit;
"Emergency function" will disconnect the item to avoid overpressure damage.
Display Act Time LED Set Time LED
Set Ramp Time
LED
Set Ramp Value LED
Select key
Timer LED
Start Stop key
increase
decrease