Constant current air sampler and sampling constant current method thereof

Abstract

The invention relates to a constant current air sampler and a sampling constant current method thereof, wherein the constant current air sampler comprises a power supply, a main control circuit board, a programmable adjustable constant voltage module arranged on the main control circuit board, an interactive control board and a suction pump; the main control circuit board is respectively connected with the power supply, the interactive control board and the suction pump; the main control circuit board manages the programmable adjustable constant voltage module thereon through a single chip microcomputer embedded system program; a flowmeter is connected to the suction pump. The constant current air sampler solves the technical problems in the prior art that due to the operating power fluctuations of the suction pump of the sampler, non-constant speed, gas flow distortion and other reasons affect the accuracy quantity of the collected samples and the accuracy of the final analysis result.

Description

technical field [0001] The invention relates to an air sampling instrument, in particular to a constant flow air sampler and a sampling constant flow method thereof. Background technique [0002] Ambient air monitoring is a technical solution that first collects air samples quantitatively, and then processes and analyzes the samples to evaluate the ambient air quality. Accurate volume of air samples collected will directly affect the accuracy of analysis results. [0003] Quantitative air sampling is usually done using air sampling instruments. [0004] The scheme of collecting a certain volume of air samples with an air sampling instrument is as follows: set the air extraction flow rate Q of the air extraction pump and the gas extraction time t, and finally obtain the air extraction volume V=Q×t. [0005] The gas extraction flow Q of the air pump in the scheme is required to remain stable during the gas extraction time t, and its stable value δ marks the flow stability pe...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a constant-flow air sampler, which solves the problems in the prior art, such as the fluctuation of the working power of the air pump of the sampler, the inconstant rotational speed, and the distortion of the gas collection flow, which affect the accurate quantitative and final sampling of the collected samples. Technical issues with the accuracy of the analytical results

[0012] The purpose of the present invention is also to provide a sampling constant flow method of a constant flow air sampler, by making the working power of the air suction pump constant and the method of fatigue drop compensation, the constant flow method with small flow fluctuation and high stability during the gas extraction period is achieved, Solve the technical problems in the prior art that affect the accurate quantification of collected samples and the accuracy of the final analysis results due to the fluctuation of the working power of the air pump of the sampler, the inconstant rotational speed, and the distortion of the gas collection flow.

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