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Organic solvent gas concentration detection method

A technology for gas concentration detection and organic solvents, applied in the analysis of gas mixtures, standard gas analyzers, and structural details of gas analyzers, etc., can solve the problems of undetectable, unstable output linearity, short life, etc., to ensure accuracy Effect

Pending Publication Date: 2022-01-11
四川希尔得科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) Generally, only the concentration of flammable gases can be detected, but for non-flammable organic solvent gases, it cannot be detected
[0005] (2) Photoion PID sensor, but the cost is high and the life is short
Since the semiconductor sensor is greatly affected by the environment during measurement, the output line shape is unstable

Method used

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  • Organic solvent gas concentration detection method

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1: see Figure 1-Figure 3 , a kind of organic solvent gas concentration detection method, comprises the following steps:

[0061] (1) Construct a detection device;

[0062] The detection device includes a single-chip microcomputer, a temperature sensor, a gas concentration sensor unit and a power supply unit, the output of the temperature sensor is connected to the single-chip microcomputer, and the gas concentration sensor unit includes a catalytic combustion combustible gas sensor B1 for detecting the concentration of organic solvent gas and the oxide semiconductor gas sensor B2, both of which are respectively connected to the single-chip microcomputer through an amplifying circuit;

[0063] (2) Calculate the temperature compensation coefficients of B1 and B2 under different temperature conditions;

[0064] (3) Calculate the relative sensitivity of B1 in different organic solvent gas environments, including (31)-(33);

[0065] (31) Take the responsivity ...

Embodiment 2

[0086] Example 2: see Figure 1-Figure 3 , on the basis of Embodiment 1, we further define that it also includes step (6), the single-chip microcomputer is connected to a display, and the calculated actual concentration value is displayed in real time through the display. All the other are identical with embodiment 1.

Embodiment 3

[0087] Embodiment 3: see Figure 1-Figure 3 , on the basis of Example 1 or 2, we limit that B1 and B2 should be zero-point calibrated before use, specifically: put the detection device in an environment of 20°C, and after power-on and aging for 24 hours, then B1 and B2 will work at this time The voltage value is calibrated to its zero point.

[0088] The zero point calibration is as follows: the single-chip microcomputer has a built-in concentration calculation formula corresponding to B1 and B2 of various organic solvent gases, and when the type of organic solvent gas is known, the single-chip microcomputer calls the corresponding concentration calculation formula and displays its corresponding B1 and B2 initial concentration value.

[0089] The organic solvent gas includes VOC gas, ammonia gas and hydrogen sulfide.

[0090] All the other are identical with embodiment 1.

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Abstract

The invention discloses an organic solvent gas concentration detection method, which adopts a catalytic combustion type combustible gas sensor B1 and an oxide semiconductor type gas sensor B2 to perform concentration detection, and during concentration detection, temperature compensation coefficients of B1 and B2 under different temperature conditions are firstly calculated for subsequent temperature compensation; secondly, the relative sensitivity of B1 and B2 in different organic solvent gas environments are calculated, a main detection sensor and a calibration sensor of each organic solvent gas are selected, and a calibration concentration value is output according to the values of the main detection sensor and the calibration sensor; and finally, an actual concentration value is obtained according to the calibration concentration value and the temperature compensation coefficient. According to the method, concentration information is calibrated under the combined action of the catalytic sensor and the semiconductor sensor, temperature compensation is carried out in combination with the temperature coefficient, and therefore output data is accurately metered, and the method is low in cost and long in service life.

Description

technical field [0001] The invention relates to a gas concentration detection method, in particular to an organic solvent gas concentration detection method. Background technique [0002] Organic solvents are mainly used in medicine, metallurgy, gas, petrochemical and other industries. Organic solvent gases are commanding volatile organic compounds that have a huge impact on human health, including styrene, propylene glycol, cresol, toluene, ethyl Benzene, xylene, formaldehyde and other gases, these gases have potential safety hazards, so they need to be detected. [0003] However, the current detection of gas concentration mainly uses catalytic sensors, or semiconductor sensors, and the photoion PID sensor with the best detection effect in the industry. There are the following problems: [0004] (1) Generally, only the concentration of flammable gases can be detected, but non-flammable organic solvent gases cannot be detected. [0005] (2) Photoion PID sensor, but the cos...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0032G01N33/007G01N33/0006G01N33/0062
Inventor 曾刚陈晓晖
Owner 四川希尔得科技有限公司
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