Thermo Scientific thermoscientific Vanquish Pumps C, Operating Manual

Page: 101 / 296

6 • Operation
Pumps C, Pumps F ( VC-Pxx, VF-Pxx)
Operating Manual Page 101
Other Parameters
Parameter Description
Compression The compression values of the pump head can
provide valuable information for troubleshooting. For
details, see
Checking the Compression Values
( } page 210) .
Curve You can specify linear or non-linear (curved) gradient
profiles.
• Curve 5 (default setting) is linear. Changes in the
composition of the delivered solvent over time are
constant.
• Curves 1 through 4 are convex upward. Convex
curves cause rapid changes in solvent composition
at the beginning of the gradient and slower changes
at the end. Slope changes over time become
extreme as curves go from 4 (least convex) to 1
(most convex).
• Curves 6 through 9 are concave upward. Concave
curves cause slower changes in solvent composition
at the beginning of the gradient and rapid changes
at the end. Slope changes over time become
extreme as curves go from 6 (least concave) to 9
(most concave).
In addition, you can define step gradients directly in
the gradient table (for example, step A and step B).
Thus, more than 11 different options are available to
change the gradient.
Degasser The degasser is enabled as a standard when the pump
is shipped (
Degasser = On ). This setting is the
preferred setting.
Leak detection Leak detection is enabled as a standard when the
device is shipped (
Leak Sensor Mode = Enabled ). This
is the preferred setting.
Purge Purge the pump in the following situations:
• To remove air bubbles that might be trapped in the
system
• When changing to a different type of solvent
For details, see Purging the Pump ( } page 103) .