Continuously adjustable standard gas distribution device

Abstract

The invention discloses a continuously adjustable standard gas distribution device which is characterized by comprising a gas source, a mixed gas distribution chamber, a sample chamber and a gas analyzer, wherein the mixed gas distribution chamber and the sample chamber are arranged in the same heating chamber; the mixed gas distribution chamber is communicated with the gas source, the sample chamber and the gas analyzer respectively through pipelines; the sample chamber is located below the mixed gas distribution chamber; the top of the sample chamber is communicated with the mixed gas distribution chamber through a connection pipeline; an opening is formed in the bottom end of the sample chamber; the opening is closed through a thread plug; sample bottles with standard samples are put into the sample chamber through the opening, and bottle openings of the sample bottles are pressed at a pipe orifice in the top of the sample chamber through the thread plug. According to the continuously adjustable standard gas distribution device disclosed by the invention, in order to guarantee a continuously constant concentration of standard gas, headspace gas distribution is adopted. A semivolatile sample is heated at high temperature, so as to increase saturated vapor pressure of a sample. The standard gas distribution device has the advantages of small size, simple structure and continuous adjustability.

Description

Technical field: [0001] The invention relates to simultaneous detection of different gases, in particular to a continuously adjustable standard gas distribution device, which can be used for continuous gas distribution and detection of volatile and semi-volatile liquid samples. Background technique [0002] Volatile organic compounds and semi-volatile organic compounds in the atmosphere are widely concerned as a kind of pollutants. After injecting standard samples, it is necessary to analyze different kinds of mixed gases, and at this time, it is necessary to use a gas distribution device to prepare mixed gases of different gases. [0003] A variety of gas-liquid mixing gas distribution devices have appeared in the prior art. For example, the Chinese patent document with the publication number CN106237877 discloses a dynamic gas-liquid mixing gas distribution device, which includes a gas matching part, a liquid gasification part, a The main board of the gas instrument syste...

AI Technical Summary

Problems solved by technology

However, the operation process is relatively cumbersome

[0004] The Chinese patent document with the publication number CN107051242A discloses a dynamic gas distribution instrument and its gas distribution method, including standard gas passage, dilution gas passage and mixed gas passage, which can realize the flow control of standard gas and dilution gas, and the operation is simple, but Analysis of liquid samples cannot be achieved

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