Explanation dual absolute leakage test

The DUAL ABSOLUTE mode is an improvement over current differential systems on the market, as it ensures more repeatability and less influence of thermal and mechanical variations on the reference section. This is because in this mode, the reference object is not continuously filled and emptied, as in normal differential systems, but measurements are taken at programmable intervals.

In Dual Absolute mode, the instrument measures the pressure difference between a test part and the reference part.

In Dual Absolute mode, the measurement of the reference part is stored in the instrument’s memory so that this trend can be used to detect differences with subsequent test parts. This leads to the following improvements:

First, the mechanical stress on the reference part is almost completely reduced because it is filled and emptied intermittently instead of continuously. This reduces wear and prolongs the life of the reference part.

Secondly, over time, the reference part can adapt better to the ambient temperature because it is mostly pressure-free. This allows differential measurements against the test parts to always be accurate, regardless of ambient temperature variations.