Agilent Technologies InfinityLab LC Series User Manual page 114

7 Test Functions and Calibration
System Pressure Test
In the first phase of the test, the pump delivers flow at a rate of 200 µL/min until a
pressure of 50 bar below the defined maximum pressure is reached. In the
second phase, the pump delivers a small flow which is increased stepwise. If
there is a leak in the system, the pressure will drop initially, as the low flow cannot
compensate the leak flow. As soon as the pump flow rate exceeds the leak flow
rate, the pressure will increase again and the test is stopped at about 20 bar
below the maximum pressure. The point in phase 2, where the lowest pressure is
reached and stays constant for a short time corresponds to the leak rate, that is
provided as a test result. A leak rate smaller than 3 µL/min is good enough for
operating the pump reliably.
Agilent InfinityLab LC Series 1260 Infinity II Isocratic and Quaternary Pumps User Manual
pressure
2
1
flow
leak rate
time
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