Heidolph LABOROTA 20 compact and safety - Manual (Page 85)

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13. Select vacuum control mode
Vacuum control requires the optional vacuum pressure valve and
–sensor.
The Mode key changes between p const and T auto
vacuum control modes. p const or
T auto LED illuminates.
You may change between these vacuum control
modes during operation. For more information about
vacuum control modes please refer to Distillation
Settings Section.
14. p const vacuum control mode
In this mode, a vacuum level once selected will be maintained. Set Vacuum key sets the level and
Set

p your control span

p (hysteresis). Act Vacuum key provokes display of actual pressure.
Change between Act Vacuum, Set Vacuum and Set

p with Select key. Act Vacuum LED, Set Vacuum
LED, or Set

p LED will illuminate.
Select Set Vacuum LED for setting the nominal
vacuum level.
The nominal suction pressure in mbar appears in
your display.
Change nominal suction pressure level with the Set
keys.
Not pressing one of these keys for 5 seconds will
return the unit to “Act” mode. The last figure entered
is saved.
Select Set

p LED for setting hysteresis of

p.
Use SET keys as required.
The Start Stop key starts evacuation.
Press the key for an instant to interrupt evacuation without opening the aerating valve, Valve LED
flashing; one more brief press on this key continues evacuation.
Act Vacuum
LED
Display
Set Vacuum LED

p LED
Aeration LED
Valve LED
LED
Vacuum
Start Stop key
Select key
increase
decrease
Mode key
P const
LED
T auto LED