Common detection methods for toxic and harmful gas detectors
When using gas detectors to detect toxic gases, we also have a variety of gas detection technologies to choose from. At the same time, there is currently no technology that can quickly, cheaply and accurately solve the problem of measuring specific toxic gases. Therefore, we also need to consider and take into account various factors when selecting appropriate detection methods for certain gases. Such factors.
1. Colorimetric tube measurement technology
In addition to the use of toxic gas alarms, colorimetric tube technology is a detection method for toxic and harmful gases currently used in industrial environmental protection. The biggest advantage of this measurement method based on chemical color reaction is that it can make up for the shortcomings of instrument measurement without suitable detection sensors.
2. Electrochemical sensor
Electrochemical sensors are currently the most common and mature detection technology used in portable gas detectors to detect toxic and harmful gases. The characteristics of electrochemical sensors are small size, low power consumption, good linearity and repeatability, and long life.
3. Semiconductor sensors
Semiconductor sensors are detection elements made of metal oxides or metal semiconductor oxide materials. They can produce surface adsorption or reaction when interacting with gases, causing conductivity or volt-ampere characteristics or surface characteristics characterized by carrier movement. potential change. It can be used to detect percentage concentrations of flammable gases and ppm-level toxic gases.
4. Ionization detector
The ionization detectors currently available on the market are divided into photoionization detectors (PID: PhotoIonizationDetector) and flame ionization detectors (FID: FlameIonizationDetector), which are the most commonly used toxic gas detectors on gas chromatography instruments. Making these two sensors into separate instruments has become the most commonly used detection method for detecting volatile organic compounds.
