What is the purpose of a gas detector and the principle of a gas detector

Entering the 21st century, China's rapid economic development, the strengthening of environmental protection, the improvement of people's safety awareness, the improvement of relevant laws and regulations are the core driving force for the development of the gas detection industry, which promotes the gas detection instrument industry for a long time in a period of rapid industrial growth, and its application fields are wide, covering industry, agriculture, transportation, science and technology, environmental protection, national defense, aerospace and daily life.

Coal mine gas, natural gas leakage, carbon monoxide poisoning, biogas poisoning, haze and other safety incidents are reported frequently, the importance of gas detection instruments to ensure personal safety is becoming more and more prominent, and the state has also issued many relevant regulations to mandate the installation of certain industries.

At present, the imported ones are more expensive, and the most cost-effective domestic brands are Bao Shi An, Kailu, etc., and they are enough for fire inspection.

Gas detector is an instrumentation tool for gas leakage concentration detection, which mainly uses gas sensors to detect the types of gases present in the environment, and gas sensors are sensors used to detect the composition and content of gases. Any sensor used to detect the composition and concentration of a gas is called a gas sensor, regardless of whether it is used physically or chemically. For example, sensors that detect gas flow are not considered gas sensors, but thermal conductivity gas analyzers are important gas sensors, although they sometimes use a more or less consistent detection principle.

Gas detector useGas detector mainly detects hydrogen sulfide, carbon monoxide, carbon dioxide, oxygen, sulfur dioxide, phosphine, ammonia, nitrogen dioxide, hydrogen cyanide, chlorine, chlorine dioxide, ozone and combustible gas and other gas detection instruments are widely used in petrochemical, chemical, coal, electric power, automobiles, air purification, building HVAC, medicine, food, environmental protection, telecommunications, home appliances, metallurgy, municipal gas, environmental monitoring and many other fields. It can also detect gas concentration or leakage in tunnels, pipelines, tanks, confined spaces, etc., to meet the measurement needs of special occasions.

Dismantling detector, detector principle, how laser detector is detected.

1. Metal oxide semiconductor sensor.

The metal oxide semiconductor sensor uses the adsorption induction of the measured gas to transform the conductivity of the semiconductor, and through the comparison of the process current change, the alarm circuit is excited. Because the semiconductor sensor is Chinese New Year's Eve more affected by the situation when measuring, the output line shape is not stable. Metal-oxide semiconductor sensors, because of their very sensitive responses, are now commonly used to measure the micro-leakage of gases.

2. Catalytic incineration sensor.

Catalytic incineration sensor is one of the most commonly used methods for detecting combustible gases, which has the characteristics of good output signal shape, reliable index, low price, and no interspersed annoyance with other non-combustible gases.

The catalytic incineration sensor adopts the principle of Wheatstone bridge, and the resistance and the combustible gas in the situation produce flameless incineration, so that the temperature changes the resistance value of the sensory resistance, breaks the bridge balance, and makes it output a stable current signal, and then through the reduction and stability of the early circuit, the final performance of the value is solid.