Buchi V-800 - Page 9

9
BÜCHI Vacuum Controller V-800/V-805
3.2.6.2 Automatic hysteresis (dP = A)
The hysteresis is automatically adjusted to the input set point
and is 5 % of the set point, but a minimum of 2 mbar.
Example: set point is 400 mbar, automatic hysteresis
 The system pressure is reduced to 400 mbar, the vacuum
source is turned off
 The system pressure increases by 20 mbar
 The vacuum source is turned on and the system pressure
is evacuated again to 400 mbar
3 Functions
Automatic hysteresis
20 mbar
400 mbar
1
2 +
t
P
0
0
420 mbar
3