Real-time compensation method for static pressure influence of differential pressure transmitter

Abstract

The invention discloses a differential pressure transmitter static pressure influence real-time compensation method. The static pressure value of the differential pressure transmitter measured by thestatic pressure sensor in real time and the current value output by the differential pressure transmitter measured by the current sensor in real time are both input into the static pressure compensation loop, and the static pressure compensation loop converts the current value into an original differential pressure signal according to the range of the differential pressure transmitter. Compensation is carried out according to the static pressure value and the original differential pressure signal to generate a compensated differential pressure signal, the compensated differential pressure signal is sent to a current output loop, and the compensated differential pressure signal is converted into a current signal by the current output loop. According to the invention, real-time compensationis carried out on the error of the differential pressure transmitter caused by the influence of the static pressure through the measured data, the real-time static pressure value and the current of the differential pressure transmitter, so that the error caused by the static pressure is greatly reduced, and the measurement accuracy of the differential pressure is greatly improved.

Description

technical field [0001] The invention relates to a measurement method in the field of metering and measurement, in particular to a real-time compensation method for static pressure influence of a differential pressure transmitter. Background technique [0002] When the differential pressure transmitter is actually used, it measures the differential pressure of liquid, gas and steam under the static pressure state, and converts the differential pressure variable into a transmittable standardized output signal, which is mainly used for the measurement and control of industrial process differential pressure parameters. . However, at present, the detection of differential pressure transmitters is usually carried out when the low pressure end is connected to the atmosphere, and no static process pressure is applied to the high and low pressure ports of the differential pressure transmitter, that is, the detection is performed in a non-static state. inconsistent with the actual st...

AI Technical Summary

Problems solved by technology

It can be seen that the static pressure has a great influence on the technical characteristics of the differential pressure transmitter

For differential pressure transmitters with poor static pressure performance, the qualified products are tested by conventional methods, but the differential pressure test results under static pressure will produce large errors

In actual use, the differential pressure transmitter is often accompanied by the influence of static pressure. If it is not corrected, the reliability of the measured data will be greatly reduced.

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