VACUUBRAND PC 3012 VARIO plastic housing - Manual (Page 59)

page 59 of 129
Vac Control function
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Vacuum control to a preset vacuum value
• Operation on demand of a speed controlled pump (NT VARIO /
VARIO-B)
Preselections
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Use the selection knob to select the parameters. All parameters can
be altered even while operation control is running.
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Set vacuum: The ”Set vacuum” is the set point for vacuum control
with pinpoint precision for NT VARIO / VARIO-B pumps.
The ”Set vacuum” is adjustable in a range of 1-795 Torr (1-1060 mbar)
or can be set to ”Turbo”. The selection ”Turbo” leads to the optimum
backing pressure for a turbomolecular pump.
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Speed: The maximum motor speed can be preselected (to control the
pumping speed).
The ”Speed” is adjustable in a range of 1-100% or can be set to ”HI”.
The selection ”HI” (recommended) provides the optimum pumping
speed of the pump and therefore an optimum ultimate vacuum.
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Maximum: An upper pressure limit can be preselected. The pump
switches off if the pressure limit is exceeded, e.g., at the end of suc-
tions or filtrations. The pressure limit is only active once the pressure
has gone below ”Maximum”.
The ”Maximum” is adjustable in a range of 794-1Torr (1059 - 1 mbar)
(at the least 1 Torr (mbar) higher than the ”Set vacuum”) and to ”Off”.
”Off” means that no ”Maximum” value is preset.
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Delay: ”Delay” determines the time the coolant valve remains open
after the process has been stopped.
The ”Delay” is adjustable in a range of 1-300 minutes or can be set to
”Off” (”Off” means that the coolant valve closes immediately when the
process stops.).
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Duration: ”Duration” determines the total process time since control
start.