Low pressure gas automatic sampling device and use method

An automatic sampling and low-pressure gas technology, which is applied in the field of detectors, can solve problems such as the difficulty in realizing low-pressure gas automatic sampling, achieve the effects of compressing space occupation, saving power devices, and overcoming difficult sealing

Inactive Publication Date: 2009-01-07
PEKING UNIV
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AI Technical Summary

Problems solved by technology

At present, in gas chromatographs, gas sampling valves or manual syringes are generally used to inject samples, and it is difficult to realize low-pressure gas automatic sampling.

Method used

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  • Low pressure gas automatic sampling device and use method
  • Low pressure gas automatic sampling device and use method
  • Low pressure gas automatic sampling device and use method

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Embodiment Construction

[0033] Aiming at the above-mentioned problems that the automatic sampling of low-pressure gas samples is difficult to realize, and the error of manual sampling is relatively large, the present invention proposes a low-pressure gas automatic sampling device and its use method to improve the utilization rate of the gas samples to be tested and save related costs .

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] The invention comprises a casing, and an air circuit system and an electric circuit system are arranged inside the casing. The gas path system includes a sample gas path system and an air path system, wherein the air path system provides power for the reciprocating movement of the cylinder in the sample gas path system.

[0036] As shown in Figure 1, the sample gas system mainly includes: a first solenoid valve 1, a second solenoid valve 2, a third solenoid valve 3, a first three-way...

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Abstract

The invention relates to an automatic sampling device of a low-pressure gas sample and a use method thereof; the device of the invention comprises a shell, the internal part of which is provided with an air path system and a circuit system, and is characterized in that: the air path system comprises a sample air path system and an air path system; wherein, the air path system supplies power to the reciprocating motion of an air cylinder in the sample air path system; the sample air path system comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a first T-cock, a second T-cock, a cross fan, a vacuum pump, a pressure sensor, a sampling can and a compression component; the air path system comprises a first three-way electromagnetic valve, a second three-way electromagnetic valve and an air cylinder; the compression component of the sample air path system is connected with the air cylinder of the air path system by a piston connecting rod; the circuit system comprises a single-chip microprocessor control unit and is electrically connected with the sample air path system and the air path system. The device and the method of the invention can be widely used for automatic sampling of a gas chromatograph, preventing the environment from causing pollution to the measured gas sample effectively.

Description

technical field [0001] The invention relates to the technical field of detectors, in particular to a low-pressure gas automatic sampling device for detecting the front end of a sample inlet of an analysis instrument and a use method thereof. Background technique [0002] Volatile organic compounds (VOCs) are one of the main components of atmospheric compound pollution, and have attracted much attention because they are closely related to human life. The sampling analysis method is usually used for qualitative and quantitative analysis of VOCs species in the atmosphere. The standard method of the US Environmental Protection Agency is often used at home and abroad, that is, to directly collect air samples on site with vacuum sampling tanks, send the sampled gas back to the laboratory, and use gas chromatograph GC and its combination technology for qualitative and quantitative analysis. However, for the samples of the same sampling steel tank, after analyzing VOCs, it is usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/24
Inventor 曾立民吴丽玲
Owner PEKING UNIV
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