VACUUBRAND VNC 2 User Manual
Page 24
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999161 / 27/03/2012
• Vacuum control of a vacuum pump (with in-line valve if applicable)
Settings in the program menu:
☞
Preset pressure (p Set): Lower pressure value for two-point control (displayed during active con-
trol by a short tip on key t).
☞
Hysteresis (∆p): Control range of the two-point control.
☞
Switch-off time (t Off): The duration of the process (vacuum control) can be preset. If the pump is
switched off due to surpassing of the pressure limit (Limit), the switch-off time is without effect.
☞
Maximal pressure (Limit): Shut down of the pump when the ”Limit” value is exceeded, e.g. at
the end of filtrations or extractions (active only
after the pressure did fall below the preset pressure
(p Set) for the first time).
Suggested values for the hysteresis ∆p are stored in the controller (setting: ”Auto”) and are adapted
automatically to the preset pressure values. It is possible to adjust the parameters manually anytime.
Program menu in basic mode pControl with a NT VARIO pump
pControl
Frequen.
Frequen.
0 %
• Vacuum control with a speed controlled pump (VACUUBRAND NT VARIO)
Settings in the program menu:
☞
Preset pressure (p Set): Exact vacuum control according to a preset pressure value.
☞
Frequency (Frequen.): Only in case of pumps with speed control (NT VARIO). Sets the motor
speed (and thus the pumping speed) when the preset pressure is decreased manually.
☞
Switch-off time (t Off): The duration of the process (vacuum control) can be preset. If the pump is
switched off due to surpassing of a pressure limit (Limit), the switch-off time is without effect.
☞
Maximal pressure (Limit): Shut down of the pump when the ”Limit” value is exceeded, e.g. at
the end of filtrations or extractions (active only
after the pressure did fall below the preset pressure
(p Set) for the first time).
p in mbar
5
10
50
80
100
200
500
700
900
1000
∆
p in mbar
(suggested values)
2
2
5
8
9
17
40
55
71
78
pControl
p Set
pControl
t Off
p Set
25mbar
t Off
off
1013mbar
Start
pControl
Limit
Limit
1060mbar
Esc
↵
↵
↵
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