What are the working principles of gas alarms?

In our lives, gas leakage accidents are like time bombs hidden in the dark, which may threaten people's lives and property at any time. In order to prevent these dangers, gas alarms have become our indispensable safety guards. Have you ever wondered how these seemingly ordinary instruments can accurately detect the traces of gas and issue alarms in time? Today, let's explore the working principle of gas alarms with Zetron Technology and unveil its mystery.

The working principles of gas alarms are mainly the following:

1. Catalytic combustion technology

Working mechanism: This technology is based on the heat released when combustible gas burns on the surface of a special catalytic element, causing the temperature of the element to rise, thereby changing its resistance value. By accurately measuring this resistance change, the concentration of combustible gas can be calculated. This mechanism shows high sensitivity and selectivity to combustible gas.

Application areas: This technology is widely used in industries such as petroleum, chemical, and gas. It is mainly used to monitor the leakage and concentration of combustible gases such as gasoline and natural gas to ensure the safety of gas stations, gas stations and other places.

2. Electrochemical technology

Working principle: This technology uses the redox reaction of gas in the electrolytic cell to generate a current directly related to the gas concentration. By accurately measuring the current intensity, the concentration of the gas can be accurately determined. This technology is known for its high precision, good selectivity and fast response speed, and is particularly suitable for the detection of toxic and harmful gases.

Application areas: Commonly used in coal mines, chemical workshops and other environments to monitor the concentration of toxic gases such as carbon monoxide, hydrogen sulfide, and chlorine, effectively protecting the lives of operators.

3. Infrared absorption technology

Operation principle: Different gas molecules have unique absorption capabilities for infrared rays of specific wavelengths. When infrared rays pass through the space containing the gas to be measured, infrared rays of specific wavelengths will be absorbed by gas molecules. By comparing the changes in infrared intensity before and after absorption, the concentration of the gas can be accurately determined. This technology has the advantages of high precision, high stability and non-contact measurement.

Application areas: Widely used in petrochemicals, environmental monitoring and other fields, used to detect the concentration of gases such as carbon dioxide and methane, such as carbon dioxide concentration detection in industrial waste gas emission monitoring.

4. Photoionization technology

Operation mechanism: This technology uses ultraviolet light to ionize the gas molecules to be tested. The generated ions form a current under the action of the electric field, and the current size is proportional to the gas concentration. This technology can detect most volatile organic compounds (VOCs) and some inorganic gases, and has the characteristics of high sensitivity, rapid response, and the ability to detect low-concentration gases.

Application areas: Widely used in environmental monitoring, industrial hygiene testing, indoor air quality testing and other fields, such as printing plants, electronics factories and other places, for monitoring the concentration of VOCs in the air.

In summary, these are the working principles of several common gas alarms. From catalytic combustion to photoionization, each principle has its unique advantages and specific application scenarios, and together they build an indestructible gas safety protection network. Understanding these working principles can not only help us better choose and use gas alarms, but also give us more peace of mind and protection when facing potential gas hazards. I hope everyone can keep gas safety in mind and let the gas alarm escort our lives and production.