Automatic gas sample injection apparatus and use method thereof

Abstract

The present invention relates to the technical field of detectors, more particularly to an automatic gas sample injection apparatus and a use method thereof. The automatic gas sample injection apparatus comprises a first selection valve, a switching valve and a second selection valve, wherein the first selection valve can be connected with the switching valve, a first carrier gas, atmosphere or a vacuum pump, the switching valve can be connected with a second carrier gas, a plurality of detection gas inlets, a plurality of quantitation rings or the second selection valve, and the second selection valve can be connected with atmosphere or a gas collection device. Compared with the automatic gas sample injection apparatus in the prior art, the automatic gas sample injection apparatus of the present invention has the following characteristics that: the automatic gas sample injection apparatus is the full-automatic sample injection without human intervention when using the gas bag or syringe to perform the sampling, the sample injection volume is accurate, the repeatability is good, the use and the maintenance are convenient, and the apparatus can be widely used in the fields of environmental monitoring centers, Centers for Disease control and Prevention, occupational disease prevention and treatment, petrochemical industry, and the like.

Description

technical field [0001] The invention relates to the technical field of detectors, in particular to a gas automatic sampling device and a using method thereof. Background technique [0002] Ambient air pollution is becoming more and more serious, and people's requirements for air quality are getting higher and higher, so there are more and more monitoring work on the quality of ambient air, and gas chromatography is generally used to detect gases. At present, there are many automatic gas sampling modes for gas chromatographs. The more mature ones on the market include headspace sampling, thermal desorption sampling, and digital irrigation sampling, each of which is used in different fields. For the national standard HJ / T38 non-methane total hydrocarbon test and other routine gas detection items that use air bags or syringes to sample, most testing units use manual sampling, which is a heavy workload and troublesome to operate. Contents of the invention [0003] The object ...

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Problems solved by technology

[0003] The object of the present invention is to provide an automatic gas sampling device to solve the problem of using a gas chromatograph to detect gas in the prior art. When using an air bag or a syringe for sampling, it is necessary to use a manual sampling method, which has a large workload and is d

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