What is Gas Sensor

一、Introduction

• In terms of environmental protection, it can detect the concentration of toxic and harmful gases in the air, thereby effectively controlling the emission of pollution sources and preventing environmental pollution.
• In terms of industrial safety, it can detect the concentration of toxic and harmful gases in the air, as well as the concentration of flammable gases, thereby ensuring the safety of industrial production.
• In healthcare, it can detect the concentration of oxygen and organic volatile gases to effectively diagnose and treat diseases.

二、Gas Sensor Types

2.1  Different types of detection gases:

• Combustible gases (including methane, propane, ethane, etc.);
• Toxic and harmful gases (including carbon monoxide, carbon dioxide, ammonia, hydrogen sulfide, etc.);
• Oxygen, volatile organic compounds (including benzene, toluene, ethyl acetate, etc.);
• Gas mixtures (such as carbon monoxide and nitrogen oxides in car exhaust);
• Specific gases (such as chlorine, fluorine, hydrogen, etc.);

• Portable (often carried by personnel from site to site);
• Fixed (commonly used for long-term monitoring and implementation monitoring);
• Online (can transmit monitoring data to the cloud system in real time);
• Wearable (wearable on an individual to detect the gas environment around the individual);
• Network transmission type (a network composed of a group of sensors that can monitor and analyze the gas concentration in a specific area);
• Intelligent type (this type of sensor integrates advanced data processing and analysis functions and is usually used in advanced monitoring systems or automated control systems);

• Active sampling (active extraction through fans or pumps, usually used for long-distance transmission or when gas dilution is large);
• Passive sampling (no external device required, direct exposure to the gas environment to be detected, suitable for air quality monitoring, environmental monitoring, etc.);
• Diffusion sampling (introducing a gas sample through a diffusion machine, usually designed with a semi-enclosed structure);
• Flow sampling (gas samples are brought into the sensor through air flow or liquid flow, usually used for quantitative measurement of gas concentration, such as industrial process testing, indoor air quality monitoring, etc.);
• Local sampling (usually used to monitor local gas concentrations on industrial production lines), etc.;

• Single gas detection (used to detect a single type of gas, such as carbon monoxide, oxygen, and methane. This type of sensor usually has high sensitivity and selectivity);
• Multi-gas detection (can detect multiple different types of gases at the same time, suitable for environments that need to monitor multiple gases at the same time);
• Toxic gas detection (dedicated to detecting toxic gases in the environment, such as carbon monoxide, ammonia, hydrogen sulfide, etc.);
• Combustible gas detection (dedicated to detection environments of combustible gases (methane, propane, natural gas, etc.), such as fire prevention, industrial safety monitoring and other environments with potential fire hazards);
• Oxygen concentration detection (usually used in medical equipment, gas analysis instruments and other applications to ensure a safe range of oxygen concentration);
• Ambient air quality monitoring (dedicated to detecting the concentration of pollutants (such as sulfur dioxide, nitrogen oxides, particulate matter, etc.) in ambient air, usually used for urban environment monitoring, industrial emission monitoring, etc.);

• Chemical sensors (detect gas concentrations through chemical reactions);
• Infrared sensors (generally suitable for detecting organic and inorganic gases);
• Electrochemical sensors (such as Oxygen Sensor, PH sensor, Glucose Sensor, etc.);
• Semiconductor sensors (commonly used to detect flammable or toxic gases);
• Optical sensors (often used for high-precision gas measurement, such as industrial process control or environmental monitoring);
• Catalytic sensors (usually used to detect combustible gases, such as methane, propane, etc.);