Active air inlet type TVOC detector

Abstract

The invention relates to an active air inlet type TVOC detector, and the detector comprises a shell and a control circuit board arranged in the shell; an antenna and a data communication module are arranged on the control circuit board, and at least one group of air circulation holes are formed in the shell. An air chamber connected with the air circulation hole, an active air inlet unit communicated with the air chamber and an exhaust channel connected with the active air inlet unit are arranged in the shell, and the control circuit board further comprises a sensor array module at least partially located in the air chamber; and the sensor array module includes at least two electrochemical gas sensors. Compared with diffusion air inflow, the active air inflow unit is more stable, air flow,temperature and humidity are more stable through active air inflow to the air chamber, the correction difficulty of the sensor can be effectively reduced, the advantages of being low in power consumption, long in service life, good in precision and stability and the like are achieved, and the application range is greatly widened.

Description

technical field [0001] The invention relates to a gas detection device, in particular to an active air intake type TVOC detector. Background technique [0002] The World Health Organization (WHO, 1989) defines total volatile organic compounds (TVOC) as a general term for volatile organic compounds with a melting point below room temperature and a boiling point between 50-260°C. With the continuous development of urbanization, the emission of VOCs has gradually increased, becoming one of the main pollutants of urban air pollution in recent years. There are many types of VOCs (more than 300 are the most common), involving a large number of industries and enterprises, complex emission conditions, and very difficult supervision. Monitoring and testing have become a key business that currently restricts VOCs governance. [0003] Especially in the petrochemical industry, the concentration of VOCs is relatively high, and various compounds such as alkanes, alkenes, alkynes and arom...

AI Technical Summary

Problems solved by technology

The traditional TVOC detector is based on a gas sensor for monitoring (PID, MEMS or electrochemical principle sensor). These sensors are usually only calibrated by one gas (ethanol or isobutylene) when they leave the factory, and are effective for different gases. A correction factor, but in the actual measurement process, it is not corrected, or it cannot be corrected accurately, resulting in the application of complex environments in the air

In addition, when the temperature and humidity in the intake structure are unstable, or the airflow is also unstable, it will also increase the difficulty of correction

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