Sampling control system for online detection of VOCs in environmental chambers

Abstract

The invention relates to the technical field of environmental protection, and particularly relates to a sampling control system for online detection of VOCs in environmental chambers. The sampling control system comprises a multi-way electromagnetic switching valve, an online gas chromatograph, a sampling pump and a PLC (programmable logic controller), wherein a gas outlet path contact of the multi-way electromagnetic switching valve is respectively switched and conducted with each gas inlet path contact, and the gas outlet path contact is connected to a sample inlet of the online gas chromatograph through the sampling pump; a plurality of gas inlet path contacts of the multi-way electromagnetic switching valve are respectively connected to sampling ports of a plurality of environment chambers in a one-to-one correspondence manner; and an I / O signal output contact of the online gas chromatograph is connected to an I / O signal input contact of the PLC, and an I / O signal output contact ofthe PLC is connected to a circuit control device of the multi-way electromagnetic switching valve. According to the sampling control system, one set of detection equipment can detect VOCs in a plurality of environment chambers, intermediate links are omitted, analysis data is reliable, the use cost is reduced for a user, and the occupied space is saved.

Description

technical field [0001] The invention relates to the technical field of energy saving and environmental protection, in particular to a sampling control system for online detection of VOC in an environmental chamber. Background technique [0002] With the development of the testing industry, more and more environmental chambers have been practically applied. Among them, there are many environmental chambers for detecting VOC emitted by furniture, building materials, automobiles and their parts, and runways. Most testing agencies use the method of sampling + laboratory analysis to detect the content of VOC in the environmental chamber. This method is not only time-consuming and laborious, but also the test results are affected by many links, and the possibility of being affected is relatively high. In addition, there are a small number of testing institutions equipped with online testing equipment for VOC environmental chambers, but due to cost reasons, there is often only one...

AI Technical Summary

Problems solved by technology

Most testing agencies use the method of sampling + laboratory analysis to detect the content of VOC in the environmental chamber. This method is not only time-consuming and laborious, but also has many links affected by the test results and is more likely to be affected.

In addition, there are a small number of testing institutions equipped with online testing equipment for VOC environmental chambers, but due to cost reasons, there is often only one, which can only meet the detection requirements of a single environmental chamber. These are things that those skilled in the art do not want to see of

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