| 摘要 |
The output signal of a differential pressure transducer which transforms a pressure difference into an electrical quantity depends not only on the pressure difference, but also on the static pressure to which the differential pressure transducer is exposed, and on the temperature of the differential pressure transducer. In order to compensate the influence of the static pressure and the temperature, the two measuring chamber halves of the differential pressure transducer have sensors which vary in opposite directions. The difference in the sensor values is a function of the differential pressure, the static pressure and the temperature. The sum of the sensor values is a function of the static pressure and the temperature. In an inductive sensor, the ohmic resistance of the sensor serves as a measure of the temperature; in a capacitive sensor, a temperature sensor thermally connected to the outer wall of the measuring chamber measures the temperature. A computing device combines the temperature signal with the sum of the sensor values and the difference of the sensor values in such a way that the output signal of the differential pressure transducer is a function merely of the differential pressure.
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