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2024

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04

Photoionization (PID) sensor

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Using high-voltage alternating electric field to ionize some inert gases to produce ultraviolet light, the energy of ultraviolet light is higher than that of visible light, it will ionize the gas into positively charged ions and negatively charged ions, and then we use electronic methods to detect the number of these ions, so as to judge the concentration of the measured gas.

Using high-voltage alternating electric field to ionize some inert gases to produce ultraviolet light, the energy of ultraviolet light is higher than that of visible light, it will ionize the gas into positively charged ions and negatively charged ions, and then we use electronic methods to detect the number of these ions, so as to judge the concentration of the measured gas. PIDs can detect compounds, especially volatile organic compounds (VOCs), in concentrations ranging from parts per billion (ppb) to parts per million (ppm). It is a supplement to non-dispersive infrared, electrochemical, and catalytic combustion gas sensors, and it is also a gas detector with relatively high technical content and relatively expensive price. photo ionization sensor pid, english full name is photo Ionization Detector. It uses the high energy of ultraviolet photons to ionize the gas substance, and then measures the weak current generated by the ionization of the substance, so as to calculate the total amount of ionized gas in the air. Its structure includes an ultraviolet light source, a pair of high-frequency electric field generators, a pair of electron collecting electrodes and a set of weak current-to-voltage circuits. The ultraviolet light ionizes the gas, thereby releasing electrons, and the electron collecting electrode collects the electrons, and then the weak current-to-voltage circuit turns the signal into a voltage signal that can be identified by the analog-to-digital converter.

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System advantage

1) High-precision and high-precision photoionization sensors can detect ppb-level (one billionth) organic gases, and general photoionization gas sensors can detect ppm-level (one millionth) organic gases. More than most commonly used sensors such as infrared sensors.

2) Non-destructive to the detection of gas The light ion sensor ionizes the gas after inhalation, and the ions formed by the gas molecules form the original gas molecules after discharge, which is non-destructive to the original gas molecules.

3) Fast response speed and long life. Except for a period of time when the gas detection system is preheated after starting up, under normal working conditions, the light ion gas sensor can respond almost in real time and can be tested continuously. When detecting dangerous gases, it is of great significance to protect the health of the inspectors. Generally, the life of an ultraviolet lamp is thousands of hours, and the light ion sensor can work normally during this period and has a long service life.

4) Wide application range Light ion sensor can detect most organic and some inorganic gases, and can be widely used in chemical industry, transportation, military, aerospace and other fields. Because the photoionization gas sensor is particularly sensitive to the concentration change of the detected substance, it plays an important role in the initial personal protection confirmation, leakage area confirmation, pollution removal and so on.

 

Application areas:

PID is mainly used for the detection of volatile organic compounds, mainly including:

Aromatic: a series of compounds containing benzene rings, such as benzene, toluene, ethylbenzene, xylene, etc;

Amine and amino compounds: hydrocarbons containing N. For example: diethylamine, etc;

● Halogenated hydrocarbons: such as trichloroethylene (TCE), perchloroethylene (PCE), etc;

● Sulfur-containing organic compounds: methyl mercaptan, sulfide, etc;

● Unsaturated hydrocarbons: butadiene, isobutene, etc;

● Saturated hydrocarbons: butane, octane, etc;

● Alcohols: isopropyl alcohol (IPA), ethanol, etc.

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