Calibration device and method for differential pressure sensor in high and low temperature and low pressure environment

Abstract

The invention provides a device and a method for calibrating a differential pressure sensor. According to the device and the method, an environmental test box is adopted to provide a low-pressure environment with the high or low temperature, a seal box is arranged in the environment, pressure differences are produced between the seal box and the environmental test box and are measured by the differential pressure sensor and a differential pressure measurement unit respectively, voltage values output by the differential pressure sensor and standard pressure difference values output by the differential pressure measurement unit are obtained, multiple voltage values and multiple pressure difference values are fitted, and a relation curve between the voltage values and the pressure difference values is obtained, so that calibration for the differential pressure sensor is realized. With the adoption of the device and the method, the differential pressure sensor has higher data accuracy in the low-pressure environment with the high or low temperature, and particularly has important application value in the aerospace field.

Description

technical field [0001] The invention belongs to the technical field of instruments and measurement, and relates to a calibration device and method for a differential pressure sensor in a high-temperature or low-temperature low-pressure environment. Background technique [0002] The differential pressure sensor is used to measure the pressure difference between two air pressure environments. It has two trachea joints, which are respectively connected to the two air pressure environments. It can convert the pressure difference between the two air pressure environments into electrical signals, and then obtain the The pressure difference between two atmospheric pressure environments. Differential pressure sensors are widely used in aviation, aerospace, automobile, oil, natural gas and other fields. [0003] The differential pressure sensor must be strictly calibrated before use to ensure the accuracy of its measurement. It is easy to calibrate it under normal temperature and p...

AI Technical Summary

Problems solved by technology

However, there is currently no device or method capable of calibrating differential pressure sensors in high, low temperature, and low pressure environments.

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