Gas detector sensor working principle

Gas detector sensor is a device that can measure and monitor gas concentration in the environment. It is widely used in various industries, such as environmental monitoring, industrial safety and indoor air quality monitoring. They quickly and accurately detect the presence of gas and convert the measured data into a readable signal. This article will introduce several common Gas detector sensor working principles.

FS01500
Electrochemical O2 Oxygen Gas Sensor FS01500

Electrochemical gas sensor

Electrochemical gas sensor is a sensor commonly used to detect combustible gases and harmful gases. The sensor consists of electrodes, electrolytes and semiconductor sensors. When the gas to be measured comes into contact with the sensor, a chemical reaction occurs between the gas molecules and the electrolyte, causing charge transfer. These charge changes will lead to changes in the measurement current. By measuring the size of the current, the concentration of the gas to be measured can be known.

FS00302-5
NDIR CO2 Sensor Module FS00302

Optical gas sensor

Optical gas sensors use optical principles to detect and measure the concentration of gases. Such sensors typically use infrared absorption spectroscopy or laser scattering techniques. As the gas to be measured passes through the sensor, the intensity of the absorbed or scattered light changes. By measuring the change in intensity of the light signal received by the sensor, the concentration of the gas can be determined.

FS01200A (4)
Semiconductor Methane Sensor FS01200A

Thermal conductivity gas sensor

The thermal conductivity gas sensor is a sensor that detects gas concentration. Its working principle is based on the thermal conduction effect. The sensor usually consists of a heating element and a temperature measuring element. When the gas to be measured contacts the sensor, its thermal conductivity will cause temperature changes, thereby affecting the resistance value of the temperature measuring element. By measuring the change in resistance, the concentration of the gas can be inferred.

FS00600B (2)
MEMS TVOC Sensor FS00600B

Semiconductor gas sensor

A semiconductor gas sensor is a sensor based on the interaction between gas and semiconductor materials. When the gas to be measured comes into contact with a semiconductor material, the gas molecules will react with the semiconductor surface, causing the conductivity of the semiconductor to change. By measuring changes in conductivity, the presence and concentration of gases can be determined.

 

Summary: The above are several common Gas detector sensor working principles. Electrochemical gas sensors detect gas concentration by measuring charge transfer, optical gas sensors detect gas concentration by measuring changes in light signals, thermal conductivity gas sensors detect gas concentration by measuring changes in temperature, and semiconductor gas sensors measure changes in conductivity to detect gas concentration. Each of these sensors has its own characteristics and scope of application. In practical applications, the appropriate sensor can be selected according to needs to monitor and control gas concentration.