Common Detection Methods of Toxic and Harmful Gas Detectors
When using a gas detector to detect toxic gases, there are also various gas detection technologies available for us to choose from. At the same time, currently there is no single technology that can quickly, inexpensively, and accurately solve the problem of measuring specific toxic gases. Therefore, when selecting an appropriate detection method for toxic gases, we need to consider and take into account various factors.
1. Colorimetric Tube Measurement Technology
In addition to using toxic gas alarms, colorimetric tube technology is still a detection method for toxic and harmful gases used in industrial environmental protection. The greatest advantage of this measurement method based on chemical color reaction is that it can make up for the shortage of not having a suitable detection sensor when using an instrument for measurement.
2. Electrochemical Sensors
Electrochemical sensors are currently the most common and mature detection technology for detecting toxic and harmful gases applied in portable gas detectors. Electrochemical sensors are characterized by their small size, low power consumption, good linearity and repeatability, and relatively long lifespan.
3. Semiconductor Sensors
Semiconductor sensors are detection elements made of metal oxides or metal semiconductor oxide materials. When they interact with gases, they can generate surface adsorption or reactions, causing changes in conductivity, volt-ampere characteristics, or surface potential characterized by the movement of carriers. They can be used to detect combustible gases at percentage concentrations and can also be used to detect toxic gases at the ppm level.
4. Ionization Detectors
The ionization detectors available on the market currently are divided into Photoionization Detectors (PID) and Flame Ionization Detectors (FID). They are the most commonly used toxic gas detectors in gas chromatographs. When these two types of sensors are made into separate instruments, they become the most commonly used detection means for solving the detection of volatile organic compounds at present.
