Agilent Technologies 1260 Infinity VL User Manual page 98

8
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.
98 1260 Infinity QuatPump VL User Manual