VACUUBRAND CVC 3000 - Manual (Page 39)

page 39 of 80
Auto mode
(only NT VARIO / VARIO-B pumps)
Preselections
+
Use the selection knob to set the parameters.
+
Sensitivity: The ”Sensitivity” of the control determines the control speed.
The ”Sensitivity” is adjustable to ”high”, ”normal” or ”low”.
High sensitivity leads to a reduced pump-down speed, e.g., for small
amounts of solvents or foaming processes. Use a low sensitivity for ”non-
critical” processes to reduce process time. Usually setting the ”Sensitiv-
ity” to ”normal” is appropriate.
+
Speed: The maximum motor speed can be preselected (to limit the
pumping speed).
The ”Speed” is adjustable in a range of 1-100% or can be set to ”HI”.
The selection ”HI” (recommended) causes an automatic limitation of
the adaptation depending on parameters determined during the pro-
cess. Only in case of very sensitive processes is it advisable to reduce
the maximum speed.
+
Minimum: If the vacuum value reaches ”Minimum” the process is
stopped. Use ”Minimum” for automatic process termination.
The ”Minimum” is adjustable in a range of 2-795 Torr (2 - 1060 mbar),
or can be set to ”Auto” or to ”Off”.
When selecting ”Auto” the controller switches off automatically at the
end of the process (boiling plateau). This is recommended only for
large amounts of solvents.
+
Delay: ”Delay” specifies the time the coolant valve remains open after
process stop.
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.).
➨
Control of a NT VARIO / VARIO-B pump in ”Auto mode”:
Automatic detection of boiling points, and automatic adjustment
of determined boiling points as process parameters change.