Automatic calibration system for gas sensor

Abstract

The invention provides an automatic calibration system for a gas sensor. The automatic calibration system comprises a steel cylinder, a gas mass flow controller, a high- and low-temperature alternate experimental box, a sensor gas hood, a sensor data acquisition circuit and an industrial computer, wherein the steel cylinder, the gas mass flow controller and the sensor gas hood constitute an air distribution system; the industrial computer is connected with the high- and low-temperature alternate experimental box to produce different constant temperatures; the industrial computer is connected with the gas mass flow controller to generate set gas concentrations at different constant temperatures; and the industrial computer is connected with the sensor data acquisition circuit to acquire gas concentration response values of the gas sensor at different constant temperatures and transmit sensor calibration data to the gas sensor. The automatic calibration system has the advantages of scientific design, convenience for using, complete functions, automatic temperature control capability, automatic dynamic air distribution capability, automatic data acquisition capability, automatic datahandling capability, high working efficiency and high reliability.

Description

technical field [0001] The invention relates to a calibration device for a gas sensor, in particular to an automatic calibration system for a gas sensor. Background technique [0002] The gas sensor output is related to the two degrees of freedom of gas concentration and ambient temperature. Gas concentration is the measured physical quantity, and ambient temperature is the interference physical quantity. In order to ensure the performance of each gas sensor, one-to-one high and low temperature experiments must be performed on the sensor product. Obtain the calibration data of sensor products; the essence of gas sensor calibration is the mapping relationship between the original analog signal of the sensor and the gas concentration in a given range at different temperatures. In the prior art, the calibration of the gas sensor requires procedures such as dynamic gas distribution, incubator experiments, collection of raw data, and sorting of raw data. These procedures require ...

AI Technical Summary

Problems solved by technology

In the prior art, the calibration of the gas sensor requires procedures such as dynamic gas distribution, incubator experiments, collection of raw data, and sorting of raw data. These procedures require manual operations, the work procedures are complicated, tedious and repetitive, and the production efficiency is low. , the pass rate is low, and the labor cost of the product is high. In addition, the direct use of standard gas also increases the production cost

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