Gas sensor：
Gas sensors are devices that help us understand the amount of gas in the environment and the natural state of its movement. This reveal the amount of gas in the environment and the nature of the gas composition with electrical signals and can provide its change.
This is a device that detects the presence of gases in a volume of space, often as part of a safety system.
A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave. This type of device is important because there are many gases that can be harmful to organic life, such as humans or animals.
Gas detectors can be used to detect combustible, flammable and toxic gases, and oxygen depletion. This type of device is used widely in industry and can be found in locations, such as on oil rigs, to monitor manufacturing processes and emerging technologies such as photovoltaic. They may be used in firefighting.
Gas leak detection：
Gas leak detection is the process of identifying potentially hazardous gas leaks by sensors. Additionally a visual identification can be done using a thermal camera These sensors usually employ an audible alarm to alert people when a dangerous gas has been detected.
Exposure to toxic gases can also occur in operations such as painting, fumigation, fuel filling, construction, excavation of contaminated soils, landfill operations, entering confined spaces, etc.
Common sensors include combustible gas sensors, photoionization detectors, infrared point sensors, ultrasonic sensors, electrochemical gas sensors, and metal–oxide–semiconductor (MOS) sensors.
More recently, infrared imaging sensors have come into use. All of these sensors are used for a wide range of applications and can be found in industrial plants, refineries, pharmaceutical manufacturing, fumigation facilities, paper pulp mills, aircraft and shipbuilding facilities, hazmat operations, waste-water treatment facilities, vehicles, indoor air quality testing and homes.
Why do we need gas sensors?
Occupational Safety: In industrial settings, workers often encounter gases that are harmful, flammable, or even deadly. Gas detectors protect employees by warning them of gas leaks, allowing them to take necessary precautions or evacuate the area promptly.
How accurate are gas sensors?
According to scientists at the National Institute for Occupational Safety and Health (NIOSH), direct reading instruments for gaseous exposure assessment should measure within ± 25% of the true concentration of the target analyte with 95% certainty.
How to test a gas sensor?
A bump test also involves introducing known quantities of gases to the sensor. However, the purposes are to check both that there are no obstructions preventing gases from reaching the sensors and that the sensors and device are functioning as intended.
Gas sensors types：
There are many gas sensors types, in order to choose the most suitable gas sensor, we need to understand the various sensor characteristics.
For example: Which sensor can measure toxic gases? Which sensor is convenient to carry? Which sensor measures more accurately? If you know enough about the sensor, you can definitely make the right choice.
Different gas types: it can be divided into combustible gas sensors (often using catalytic combustion, infrared, thermal conductivity, semiconductor type), toxic gas sensors (generally using electrochemical, metal-semiconductor, photoionization, flame ionization), Harmful gas sensors (often infrared, ultraviolet, etc.), oxygen (often paramagnetic, zirconia) and other types.
Usage methods: it can be divided into portable gas detectors and fixed gas detectors.
Sampling methods: it can be divided into diffusion sensors (the sensor is directly installed in the measured environment, and the measurement gas is in direct contact with the detection unit through natural diffusion), pumping sensors (through the suction pump, etc., the gas is sucked into the detection unit.
Whether the gas needs to be diluted, it is divided into complete inhalation and diluted inhalation).
Functions: it can be divided into a single gas sensor (only one gas can be detected) and a composite gas sensor (can detect multiple gases at the same time).
Detection principles: it can be divided into semiconductor gas sensor, electrochemical gas sensor, NDIR gas sensor, catalytic gas sensor, thermal conductivity gas sensor, magnetic gas sensor and so on.