Gas sensor calibration device and calibration method thereof

A gas sensor and calibration device technology, applied in the direction of standard gas analyzers, measuring devices, and gas mixture analysis, can solve the problems of high labor intensity, low work efficiency, and low calibration accuracy, so as to improve calibration accuracy and use effect Good, simple operation effect

Active Publication Date: 2016-09-28
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas sensors that have been used for a long time are affected by corrosion and zero point drift, and the detection accuracy is greatly reduced. Inaccurate detection of toxic and harmful gases will seriously threaten people's production and life
[0003] At present, domestic gas sensor calibration equipment is relatively backward, and most of them use manual calibrator and remote calibrator. Calibration by point detection, its single structure and function, is not suitable for multi-type and large-quantity sensor calibration, and there are problems of high labor intensity and low work efficiency, especially low calibration accuracy

Method used

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  • Gas sensor calibration device and calibration method thereof
  • Gas sensor calibration device and calibration method thereof
  • Gas sensor calibration device and calibration method thereof

Examples

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Effect test

Embodiment 1

[0029] like figure 1 As shown, a gas sensor calibration device includes a gas cylinder 1 for storing detected gas, a pressure reducing valve 2, a constant volume gas distribution device 5, a gas chromatograph 6, a data acquisition module 7 and a host computer 8. Fixed volume air distribution device 5 such as figure 2 As shown, its main body is a metal cylindrical cavity 5-1 with a volume V, and both ends of the metal cylindrical cavity 5-1 are provided with metal end caps, which are fixed by bolts. A gas inlet 5-2 is arranged at one end of the metal cylindrical cavity 5-1, and a gas outlet 5-3 is arranged at the other end, and a ball valve is arranged at the gas inlet 5-2 and the gas outlet 5-3. A first sensor base 5-4 and a gas sampling port 5-6 are provided on the side surface of the metal cylindrical cavity 5-1, and the gas sampling port communicates with the inside of the metal cylindrical cavity 5-1.

[0030] The inlet of the pressure reducing valve 2 is connected to t...

Embodiment 2

[0039] like image 3 As shown, a gas sensor calibration device includes a gas cylinder 1 for storing detected gas, a pressure reducing valve 2 , a fixed volume gas distribution device 5 , a data acquisition module 7 and a host computer 8 . Fixed volume air distribution device 5 such as Figure 4 As shown, its main body is a metal cylindrical cavity 5-1 with a volume V, and both ends of the metal cylindrical cavity 5-1 are provided with metal end caps, which are fixed by bolts. A gas inlet 5-2 is arranged at one end of the metal cylindrical cavity 5-1, and a gas outlet 5-3 is arranged at the other end, and a ball valve is arranged at the gas inlet 5-2 and the gas outlet 5-3. A first sensor base 5-4 and a second sensor base 5-5 are provided on the side surface of the metal cylindrical cavity 5-1.

[0040] The inlet of the pressure reducing valve 2 is connected to the gas outlet of the gas cylinder 1, and the outlet of the pressure reducing valve 2 is connected to the gas inlet...

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Abstract

The invention discloses a gas sensor calibration device which is convenient to calibrate, high in precision and good in using effect and a method. A constant-volume gas preparation device is designed for the problems that an existing high-precision gas preparation system is complex and high in cost, and an existing gas sensor is low in calibration precision; the gas concentration in the device is increased by precisely controlling the valve switching-on time, and then gases with the different concentrations are sequentially prepared; the gas preparation method is easy to operate and high in precision. In addition, the gas concentrations under different concentrations are detected by gas chromatograph or a calibrated sensor to serve as true concentrations, and then the sensor calibration precision is further improved. Due to the fact that the sensor has the nonlinearity, the calibration mode of the sensor is different from that of a traditional sensor, precise sensor calibration is achieved by acquiring sensor detection values and true concentration values under the different concentrations for curve fitting, and errors which are influenced by the sensor characteristics and caused by single concentration calibration are avoided.

Description

technical field [0001] The invention relates to a gas sensor calibration device and a calibration method thereof. Background technique [0002] A gas sensor is a converter that converts a certain gas volume fraction into a corresponding electrical signal. The detection head conducts conditioning of the gas sample through the gas sensor, usually including filtering out impurities and interfering gases, drying or cooling the instrument display part. With the continuous improvement of people's living standards and the increasing emphasis on environmental protection, the detection of various toxic and harmful gases, the detection of air pollution, industrial waste gas, and the detection of food and living environment quality have raised the accuracy of gas sensors. higher requirement. Gas sensors that have been used for a long time are affected by corrosion and zero-point drift, and the detection accuracy is greatly reduced. The inaccurate detection of toxic and harmful gases ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N30/02
CPCG01N30/02G01N33/00G01N33/0006G01N2030/025
Inventor 蒋曙光崔传波王凯吴争艳邵昊王彦恒李津王彤
Owner CHINA UNIV OF MINING & TECH
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