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7.3
Calibrate and operate the ÄKTA ready gradient pump
Introduction
The calibration procedure compensates for differences in capacity of pump A (P-201)
and pump B (P-202) at a given motor speed, as a result of pump tubing position and
properties. With the assumption that each pump has a linear behavior of flow rate vs.
rpm within a given range of operating pressure, a compensation factor is determined
within the calibration procedure to allow a synchronization of the pumps against a
nominal volumetric gradient.
Pump compensation
Action
Step
Start the system pump at a flow rate planned for the actual separation.
1
When flow rate is stable, click P201Gain and shift to Gradient 100%.
2
When flow rate is stable, click P202Gain and shift to Gradient 0% and activate
Flow_Compensation.
3
Calibration procedure
Pump A (P-201) is ramped up to a target flow rate and the rpm value is recorded (by
execution of the instruction P201Gain). In a second step, pump B (P-202) is ramped up
to the same target flow rate and the actual rpm value is recorded (by execution of the
instruction P202Gain). Then a compensation factor (P202Factor) is calculated for Pump
B to achieve identical flow rate vs. rpm characteristic as Pump A.
The compensation factor is generated in UNICORN by switching FlowCompensation to
ON. The actual FlowCompensation value can be displayed in RunData.
Pump tubing is more sensitive to wear and tear. If worn tubing is used the
gradient system must be calibrated more frequently.
Note:
ÄKTA ready Operating Instructions 28960345 AD
103
7 ÄKTA ready gradient
7.3 Calibrate and operate the ÄKTA ready gradient pump