Important Operating Parameters - Thermo Scientific thermoscientific Vanquish Pumps C Operating Manual

6.7

Important Operating Parameters

Flow Parameters
Pressure Parameters
Pumps C, Pumps F ( VC-Pxx, VF-Pxx)
Operating Manual
The parameters described in this section should be considered for
routine operation of the device. You can usually access these
parameters from the Chromeleon user interface.
If a parameter listed below is not available in the Chromeleon software,
consider updating the firmware and Chromeleon version.
For more information, refer to Chromeleon Help and documents.
Parameter
Flow
Flow ramps
Flow acceleration
Flow deceleration
Parameter
Pressure limits
Description
The allowed flow range is indicated in the dialog box
for the pump in the Instrument Configuration
Manager. You can change the upper and lower limit
for the flow rate within the allowed range.
Set the flow acceleration and flow deceleration.
Recommendation: Set the parameters to a value
between 1/3 and factor 3 of the (column) flow rate.
The flow acceleration (Maximum Flow Ramp Up)
determines how fast the pump starts delivering with
the selected flow rate. If the value is too low, it will
take correspondingly long for the pump to build up
the necessary pressure and start delivery the required
flow. If the value is too high, this may impair the
column lifetime.
The flow deceleration (Maximum Flow Ramp Down)
determines how fast the pump reduces the flow. If
the value is too low, it will take correspondingly long
for the pump to reduce the flow and thus the
pressure. If the value is too high, this may impair the
column lifetime.
Description
The allowed pressure range is indicated in the dialog
box for the pump in the Instrument Configuration
Manager. You can adapt the upper and lower
pressure limits within the allowed range.
• The lower pressure limit helps to prevent the pump
(and column) from running dry. A typical setting is
1 MPa.
• The upper pressure limit helps to protect the column
from too high pressure. The column and the
application determine the appropriate setting.
When the pump pressure is outside the specified
limits, the Chromeleon software stops the pump flow
and aborts a running Queue.
6 • Operation
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