8
BÜCHI Vacuum Controller V-800/V-805
Manual hysteresis
3 Functions
3.2.4 Configuration - Communication
In this menu, you defined whether:
• Whether rotation of the evaporating flask is to start
automatically when the controller starts (only in connection
with Rotavapor R-200/R-205)
• Whether the evaporating flask is to be lowered into the
bath automatically when the controller starts
• Whether the evaporating flask is to be automatically lifted
from the bath when the controller stops
• Whether the apparatus is to be automatically ventilated
when the controller stops.
All of these functions can be turned on and off.
3.2.5 Set point (P Set)
Defines the value, at which the system pressure is kept
constant. An input value stays in the working memory after
the apparatus is turned off and is automatically recalled when
you start the apparatus again.
3.2.6 Hysteresis (dP)
Defines the band width, within which a chosen set point is
kept constant.
3.2.6.1 Manual hysteresis (dP = 500… 1mbar, A)
Example: set point 400 mbar, hysteresis 7 mbar
System pressure is reduced to 400 mbar, the vacuum
source is turned off
The system pressure increases to 7 mbar
The vacuum source is turned on and the system pressure
is evacuated again to 400 mbar
7 mbar
400 mbar
1
3
2
t
P
0
0
407 mbar
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