User manual

98 Bio-inert Quaternary Pump User Manual

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 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.

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