A VOC sampling time optimization method suitable for low-pressure environment and a remote sampling system thereof

By sensing temperature and pressure parameters in real time under low pressure, automatically calculating and correcting the sampling duration, and combining a bypass purging mechanism and remote automatic triggering technology, the problem of cross-contamination and flow drift in VOC sampling under low pressure is solved, achieving high-precision, fully enclosed multi-channel automated sampling.

CN122385267APending Publication Date: 2026-07-14TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Filing Date
2026-04-28
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies suffer from severe cross-contamination and flow drift issues when sampling volatile organic compounds (VOCs) under low-pressure environments, and the need for manual operation leads to inaccurate test data and poor repeatability.

Method used

A VOC sampling time optimization method and its remote sampling system suitable for low-pressure environments are adopted. By sensing temperature and pressure parameters in real time, the sampling time is automatically calculated and corrected. Combined with bypass purging mechanism and remote automatic triggering technology, multi-channel automated sampling is realized.

Benefits of technology

It achieves fully enclosed, high-precision VOC sampling under low-pressure conditions, eliminating cross-contamination and flow drift errors, and ensuring sampling quality and safety.

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Abstract

The application discloses a VOC sampling time optimization method suitable for a low-pressure environment and a remote sampling system thereof. The method calculates the environmental density compensation coefficient and the sampling pump mechanical efficiency compensation coefficient by monitoring the absolute pressure and temperature in the low-pressure cabin in real time, and automatically optimizes and calculates the actual sampling time by combining the target standard sampling volume and the pump nominal flow, so as to compensate for the gas density drop and pump efficiency attenuation caused by the low pressure and ensure the accuracy of the sampling volume. The system comprises a material test environment cabin arranged in the low-pressure cabin, a multi-channel gas path, a sensing module, a control center and a non-invasive flexible sampling execution module. The execution module adopts an external finger robot to trigger the sampling pump switch, does not need to modify the pump circuit and guarantees the safety in the low-pressure environment. The system also adopts the multi-channel gas path design with zero gas purging, effectively prevents cross contamination and realizes the remote, accurate and automatic VOC sampling in the low-pressure environment.
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