138 1260 Infinity Binary Pump User Manual
8 Test Functions and Calibration
Leak Rate Test
Test Principle
A solvent can be chosen from available solvent channels and a maximum
target pressure can be defined at which the test will be run. Typically,
this is the maximum pressure specified for the pump. The test can be run
with any solvent compatible to the pump.
Before the test, the pump is flushed with solvent in order to remove air
bubbles, as air bubbles are compressed during the test and therefore
would appear as leaks. Using a degasser is highly recommended.
Initially, the pressure is increased to about 100 bar below the target
pressure, which has been set for the test.
Then piston 1 is brought to its rear position. An increasing flow is
delivered by piston 1. In case of a leak, the pressure will drop initially as
long as the flow rate delivered by the piston is lower than the leak rate.
As soon as the flow rate of the piston exceeds the leak rate, the measured
pressure will increase again. Therefore the minimum pressure of that
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