Principles and applications of toxic gas detectors

Toxic gas detector is a kind of instrument used to detect the concentration of harmful gases in the air, which is widely used in the fields of chemical industry, petroleum, metallurgy, electric power, medicine and environmental protection, etc. Fosensor will introduce the principle, classification, application and maintenance of toxic gas detectors.

Toxic gas detectors working principle

The principle of Toxic gas detectors is to use chemical reaction or physical adsorption and other methods to react the harmful gases in the air with the sensor inside the detector, and determine the concentration of harmful gases in the air through the electrical signal output from the sensor. Common sensors include the following.

Electrochemical gas sensor is a kind of sensor that reacts the gas with the electrode, and its principle is to use the chemical reaction between the gas and the surface of the electrode to generate electric current, and judge the gas concentration by measuring the size of the electric current. Different electrochemical sensors are suitable for different gases, such as oxygen, carbon dioxide, carbon monoxide, chlorine and so on.

Infrared gas sensor is a kind of sensor that utilizes the absorption characteristics of gas molecules to infrared radiation to detect gas concentration. The principle is to use the infrared radiation source to emit infrared beams through the gas, which are absorbed by the gas molecules, and then the remaining beams are received by the receiver, and the gas concentration is determined by measuring the received light intensity. Infrared sensors are suitable for detecting gases such as carbon dioxide, methane and ethane.

PID gas sensor is a sensor that uses a UV light source to excite gas molecules to produce ionization, and determines the gas concentration by measuring the current generated by the ionization. The principle is to use the ultraviolet light source generated by the ultraviolet beam excitation of gas molecules, so that their ionization to produce positive and negative ions, positive and negative ions in the electric field under the action of the electric current, through the measurement of the size of the electric current to determine the concentration of the gas.PID sensor is suitable for the detection of volatile organic compounds, benzene, toluene and other gases.

Toxic gas detectors classification

Toxic gas detectors can be categorized into single gas detectors and multi-gas detectors, portable detectors and fixed detectors according to the type of gas detected and the different detection methods.

Single gas detectors are suitable for detecting a single gas, such as carbon monoxide, oxygen, chlorine and so on. Multi-gas detector can detect multiple gases at the same time, such as oxygen, carbon monoxide, carbon dioxide, chlorine and so on. Portable detectors are suitable for on-site detection, characterized by portability, easy operation and fast response. Fixed detectors are suitable for long-term monitoring, characterized by stability and high accuracy.

Toxic gas detectors applications

Toxic gas detectors are widely used in chemical industry, petroleum, metallurgy, electric power, medicine, environmental protection and other fields, mainly used in the following areas:

1. Industrial safety: detecting harmful gases produced during industrial production, such as carbon monoxide, chlorine, ammonia, etc., to protect the safety of workers.

2. Environmental monitoring: detecting the concentration of harmful gases in the air, such as carbon dioxide, methane, benzene, etc., to guarantee the safety of the environment.

3. Medical and health care: Detect the concentration of harmful gases in the air, such as oxygen, carbon monoxide, etc., in the operating rooms and wards of hospitals to ensure the safety of patients.

4. Fire fighting and rescue: Detecting the concentration of harmful gases in the fire scene, such as carbon monoxide, cyanide, etc., to ensure the safety of firefighters.