Differential pressure sensor and method of differential pressure measurement

摘要

A differential pressure sensor, for determining the differential pressure between two measuring points, comprises a pressure vessel 4 which is filled with a transfer fluid; a measuring cell which is arranged in the pressure vessel 4 and is surrounded by the transfer fluid, with two half-cells 1; a diaphragm-like deforming body 2 which separates the two half-cells 1 from each other in a pressuretight manner; two pressure supply lines 7, which respectively feed the pressure from one of the two measuring points outside the pressure vessel 4 to one of the two half-cells; and at least one pressure accumulator 6, the pressure of which acts on the transfer fluid in the vessel. Elastic or compressible bodies with a linear or degressive characteristic are suitable as the pressure accumulator 6. The pressure accumulator 6 compensates for changes in volume of the transfer fluid on account of temperature fluctuations.