Calibration method of electrochemical sensor

Abstract

The invention provides a calibration method of an electrochemical sensor. The method comprises the following steps: inputting different concentrations of a standard gas to an electrochemical sensor to be calibrated through a dynamic gas distribution device, measuring the output value of the electrochemical sensor, and determining the calibration zero point of the sensor; and respectively fitting the zero point of the electrochemical sensor to be calibrated, the temperature curve of a measuring range and the temperature curve of cross interference in a temperature range of -20-40DEG C. The dynamic gas distribution device is adopted to carry out multi-point concentration test in order to accurately reflect the state of the sensor; a relative error value is adopted to calibrate, so the calibration result is more close to a practical condition; and a least square method quadratic polynomial fitting sensor input and output curve relationship is adopted, so the error in the calibration process is greatly reduced. The method has the advantages of wide test surface and high estimation accuracy, and can meet users' practical demands on test selection of sensors.

Description

technical field [0001] The invention relates to a calibration method of an electrochemical sensor, in particular to a method for calibrating the output of the sensor by fitting the temperature curves of zero point and range and the temperature curve of cross-interference of the electrochemical sensor. Background technique [0002] The earliest electrochemical sensors date back to the 1950s, when they were used for oxygen monitoring. By the mid-1980s, small electrochemical sensors were used to detect many different toxic gases in the PEL range and showed good sensitivity and selectivity. [0003] At present, sulfur hexafluoride (hereinafter referred to as SF 6 ) The application of electrical equipment is becoming more and more extensive, and more attention has been paid to the detection of decomposition products of this kind of electrical equipment. Many domestic units have produced this type of testing equipment. SF 6 The gas has excellent insulation performance and arc e...

AI Technical Summary

Problems solved by technology

However, the actual input-output relationship is not a straight line relationship, and there are large errors in the calibration process

[0011] At present, there is a lack of monitoring SF for different manufacturers 6 Calibration method of electrochemical sensor for decomposition products of electrical equipment

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