Explaining the Working Principle of Split Type O3 Gas Sensor

User:JXCTUpload time:Sep 22 2023


In recent years, the concern for air pollution and its adverse effects on human health has increased significantly. As a result, the demand for efficient and accurate gas sensors has grown. One such sensor is the O3 Gas Sensor, which is widely used to detect and measure ozone (O3) gas concentrations in various environments. This article aims to explain the working principle of the Split Type O3 Gas Sensor, shedding light on its components, operation, and applications.

Sensor Components:

Split Type O3 Gas Sensor consists of several essential components, including a gas sensing element, a microcontroller, a display unit, and a communication interface. The gas sensing element is the heart of the sensor, responsible for detecting and measuring the concentration of ozone gas. It is typically made of a semiconductor material such as tin dioxide (SnO2) or indium oxide (In2O3), which exhibits a change in electrical conductivity when exposed to ozone.

Working Principle:

The working principle of the Split Type O3 Gas Sensor is based on the principle of gas adsorption. When ozone gas comes into contact with the gas sensing element, it chemically reacts with the material, leading to a change in the conductivity of the sensor. This change is proportional to the concentration of ozone gas present in the environment. The microcontroller processes the electrical signals received from the gas sensing element and converts them into a readable format for the display unit.


The Split Type O3 Gas Sensor operates in two main modes: calibration mode and detection mode. During the calibration mode, the sensor is exposed to a known concentration of ozone gas to establish a baseline reading. This allows the microcontroller to calibrate the sensor and ensure accurate measurements. In the detection mode, the sensor continuously monitors the surrounding environment for ozone gas. When the gas concentration exceeds a predefined threshold, the sensor triggers an alarm or sends a signal to the control system.


a. Indoor Air Quality Monitoring: The sensor is used in buildings, offices, and homes to monitor ozone levels and ensure a healthy and safe living environment.

b. Industrial Processes: It is employed in industries such as semiconductor manufacturing, chemical production, and wastewater treatment plants to detect and control ozone gas emissions.

c. Environmental Monitoring: The sensor is utilized in environmental monitoring systems to measure ozone concentrations in the atmosphere, helping to assess air quality and pollution levels.

d. Ozone Generators: The sensor is integrated into ozone generators to regulate and maintain the desired ozone concentration for applications such as water purification and disinfection.

Advantages and Limitations:

The Split Type O3 Gas Sensor offers several advantages, including high sensitivity, fast response time, and low power consumption. It is also compact and easy to install. However, it has some limitations, such as susceptibility to interference from other gases and the need for periodic calibration to maintain accuracy.


The Split Type O3 Gas Sensor plays a crucial role in monitoring ozone gas concentrations in various environments. Its working principle, based on gas adsorption and conductivity changes, enables accurate and reliable detection. With its wide range of applications and benefits, this sensor contributes to ensuring a healthier and safer living and working environment for individuals. Continued research and development in gas sensor technology will further enhance the performance and capabilities of the Split Type O3 Gas Sensor, leading to improved air quality management in the future.