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High-precision pressure measurement with PASCAL Ci4 and diaphragm seals: ATC technology reduces temperatur error up to 90% - Pressure transmitter PASCAL Ci4 with additional temperature sensor behind the diaphragm seal.

The new developed ATC technology reaches a quantum leap in the temperature stability of diaphragm seal systems. High-precision pressure measurements can thus be carried out together with the high accuracy of the LABOM pressure measuring device.

Diaphragm seals are frequently used in the process industry for pressure measurements to protect the measuring device against aggressive media or – for example in the pharmaceutical industry – to create a gap-free process connection. The process is separated from the measuring device by means of a thin metal diaphragm. A pressure transmission fluid behind the diaphragm transmits the process pressure to the actual pressure sensor. A solution can be found for almost any pressure measurement task using diaphragm seal systems.

A drawback is that the diaphragm seal is not compley non-reactive. The pressure transmission fluid expands as a result of the process heat and deflects the separating diaphragm. This generates a restoring force depending on the rigidity of the above mentioned diaphragm, which is received as an error in the pressure measurement.

LABOM has developed and implemented a further compensation process to create a solution for this problem. The temperature of the pressure transmission fluid is recorded with an additional temperature sensor (ATC technology (ATC = Active Temperature Compensation)). This sensor is positioned as close as possible to the separating diaphragm. The sensor thus records the temperature of the liquid behind this diaphragm with good accuracy.

Because of this additional temperature measurement the resulting errors can mathematically be corrected immediay. Studies have shown that errors can be reduced by 80-90% with small diaphragm seals in a stationary state. High-precision pressure measurements can thus be carried out directly benefitting from the high accuracy of the pressure measuring device.