Common methods of detection for toxic and noxious gas detection systems
When using gas detectors to detect toxic gases, we also have multiple gas detection technologies to choose from. At the same time, there is currently no technology that can quickly, inexpensively, and accurately solve the problem of specific toxic gas detection. Therefore, when choosing appropriate gas detection methods, we also need to consider and consider various factors.
1. Color tube measurement technology
In addition to using toxic gas alarms, colorimetric tube technology is currently used as a detection method for toxic and harmful gases in industrial environmental protection. The biggest advantage of this measurement method based on chemical color reactions is that it can compensate for the lack of suitable detection sensors encountered when using instruments for measurement.
2. Electrochemical sensors
Electrochemical sensors are currently the most common and mature detection technology for detecting toxic and harmful gases in portable gas detectors. The characteristics of electrochemical sensors are small size, low power consumption, good linearity and repeatability, and long lifespan.
3. Semiconductor sensors
Semiconductor sensors are detection components made of metal oxides or metal semiconductor oxide materials. They can generate surface adsorption or reactions when interacting with gases, causing conductivity or voltammetry characteristics or surface potential changes characterized by carrier movement. It can be used to detect combustible gases with a percentage concentration, as well as toxic gases at the ppm level.
4. Ionization detector
At present, the ionization detectors that can be seen in the market are divided into photodetectors (PID) and flame ionization detectors (FID). They are the most commonly used toxic gas detectors in gas chromatography instruments. Making these two sensors into separate instruments has become the most commonly used detection method for detecting volatile organic compounds.
