Nowadays, with the accelerating process of urbanization, the problem of air pollution has become increasingly dangerous. According to relevant data research, China's annual VOC emissions are about 30 million tons. VOC is the abbreviation of volatile organic compounds. When it reaches a certain concentration, it will have a huge impact on the health of the body. In order to effectively avoid harm to the human body, it will undoubtedly promote the hot market of VOC detectors. The application of VOC detector can be used to continuously measure toxic and harmful organic VOC gas in dangerous or industrial environment, which is very suitable for personal safety protection and on-site VOC detection. Do you know how many types of VOC detector work? The following is a brief introduction by yi yun Tian:

There are two main working principles of VOC detector:

1. The PID light ion principle is used for detection:

VOC detector uses PID photoionization principle to detect, that is, ultraviolet light generated by ion lamp is used to irradiate/bombard the target gas, the target gas will be ionized after absorbing enough ultraviolet light energy, and the tiny current generated after gas ionization is measured, thus, the concentration of the target gas can be detected.

PID photoionization principle can be divided into 3 types according to ion lamp energy: 9.6eV, 10.6eV and 11.7eV. in general, 10 is the main choice. 6eV, if the same environment at the same time with styrene, benzene, toluene and other gases, measured is styrene, benzene, toluene and other comprehensive concentration value, that is, VOCs value, also known as non methane total hydrocarbon value. If the environment is single- -Component benzene, then the concentration value of benzene is measured.

2, using FID flame ion principle for detection:

VOC detector uses FID flame ion principle for detection, it is a VOCs monitoring system based on industrial-grade gas chromatography technology, which can realize on-site emergency monitoring of concentration parameters of volatile organic gases such as non-methane total hydrocarbons, benzene, toluene, xylene, alcohols, lipids, halogenated hydrocarbons, olefins, alkynes, alkanes, nitriles and other volatile organic gases with boiling points below 260 degrees at normal pressure.

In summary, it is the working principle of the VOC detector.To put it simply, the advantages of PID light ion principle detector are fast data output, low procurement cost and maintenance cost, small size and easy to carry. The disadvantage is that it cannot analyze on-site components and can only detect comprehensive concentration. and FID. The advantage of the detector is that it has high precision and can analyze the composition. The disadvantage is that the procurement cost and maintenance cost are high, it is not convenient to carry, and it cannot meet the on-site data.