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The differential pressure sensor
2016-01-20

The differential pressure sensor is a pressure sensor that measures the difference of two absolute pressures, the so-called differential pressure. The differential pressure sensor may consist of two measuring chambers by a diaphragm hermetically separated from one another. The deflection of the membrane is then a measure of the magnitude of the differential pressure.

Differential pressure transmitter for continuous measurement of pressure differences in liquids, vapors, gases and dust. From the differential pressure, also the hydrostatic level can be calculated through a pipeline in a container or the mass flow. It is for example also the saturation of a particulate filter measured by measuring before and after the particulate filter, the differential pressure.

If the measurement properties of a measurement is desired difference between two pressures, the system is pressurized from both the left and right with the different process pressures, whereby the membrane deflection reflects the difference in pressure. For aggressive media is built before the actual measuring chamber according to a ceramic or metallic separating diaphragm, so that these media do not penetrate to the diaphragm and can destroy them.

The evaluation results and provides a conversion gain of the goods delivered by the load cell signal. The original signal is the difference of the capacities of the two capacitors. Due to the applied AC voltage, this capacitance difference is evaluated and converted to a measurement signal provided.

An alternative forms of the silicon pressure sensor, which accommodates the deformation of the membrane applied resistors. This measuring circuit can be operated with direct voltage.