Thermo Scientific Vanquish VH-P10-A-02, Operating Manual

Page: 94 / 238

6 • Operation
Page 94 Vanquish Pumps (VH-P10-A-02) Operating Manual
Parameter Description
Flow ramps 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.
Flow acceleration 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.
Flow deceleration 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.
Leak detection Leak detection is enabled as a standard when the
pump is shipped (
Leak Sensor Mode = Enabled ). This
is the preferred setting.
Piston calibration value The Piston Calibration Value property must match the
3-digit calibration value that is imprinted on the rear
of the piston. You have to update the value in the
Chromeleon software, for example, when you install
new pistons (see
page 144 ).
Piston seal washing/rear
seal washing The seal wash system is enabled and cannot be
disabled. As a standard, the pump performs a seal
wash in the following situations:
•
Once per hour
• Each time the pump is turned on
If required, you can start an additional seal wash cycle
or stop a running cycle:
•
If the seal wash pump is in
Idle
mode, select
Active
to start a wash cycle.
•
If the seal wash pump is in Active mode, select Idle
to stop a running wash cycle.
You can disable the drop counter functionality by
setting
Rear Seal Wash Monitoring to Off . Note that
disabling drop detection will not disable the seal wash
system. However, messages relating to the seal wash
system (for example, when the system has run out of
wash liquid) or piston seal leakage will no longer alert
you in the user interface.