Important Operating Parameters - Thermo Scientific Vanquish VH-P10 Operating Manual

6.7

Important Operating Parameters

Vanquish Pumps (VH-P10) Operating Manual
The parameters described in this section should be considered for
routine operation of the pump. You can usually access them from the
Chromeleon user interface. If a parameter listed below is not available in
Chromeleon, consider updating the firmware and Chromeleon version.
For more information, refer to Chromeleon Help and documents.
Parameter
Compression
Curve
Degasser
Flow
Description
The compression values of the pump head can provide
valuable information for troubleshooting. For details,
see section 8.4 Checking the Compression Values,
page 198.
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.
The degasser is enabled as a standard when the pump
is shipped (Degasser = On). This setting is the
preferred setting.
The allowed flow range is indicated in the dialog box
for the pump in the Chromeleon 7 Instrument
Configuration Manager (Chromeleon 6.8 Server
Configuration). You can change the upper and lower
limit for the flow rate within the allowed range.
6 • Operation
Page 91