Classification and working principle of gas detectors
Gas detector is an instrument tool for detecting gas leakage concentration, mainly referring to handheld/fixed type. Mainly used to check the types of gases present in the environment. But for gas detectors, many friends are not clear about the classification and working principle of gas detectors. Let's take a look together!
The key component of a gas detector is a gas sensor. Gas sensors can be divided into three categories based on their principles:
1. Gas sensors utilizing physical and chemical properties, such as semiconductors, catalytic combustion, solid thermal conductivity, photoionization, etc.
2. Gas sensors that utilize physical properties such as thermal conductivity, optical interference, infrared absorption, etc.
3. Gas sensors utilizing electrochemical properties, such as current type, potential type, etc.
Gas detectors measure and indicate the concentration of certain gases in the air through different technologies. Gas detectors are usually battery driven devices used for safety purposes. They are manufactured as portable or fixed (fixed) devices, representing high levels of gas through a series of audible or visible indicators (such as alarms, lights, or signal combinations). Although many old-fashioned standard gas detection devices are manufactured to detect a single gas, modern multifunctional or multi gas equipment can detect multiple gases simultaneously. Some detectors can be used as separate units to monitor small workspaces, or units can be combined or connected together to create a protection system.
When the gas detector measures the gas concentration, the sensor response serves as a reference point or scale. When the response of the sensor exceeds a pre-set level, an alarm will be activated to alert the user. Most detectors have the same function: to monitor and warn of hazardous gas levels. However, when considering which type of detector to install, it is helpful to consider different sensor technologies.
Gas detectors with different detection objects may have different detection principles, and detectors with the same measurement object may also have different detection principles. For example, methane detectors can be catalytic combustion or infrared detection, and there is a significant difference in accuracy and lifespan between the two.
