Common Detection Methods and Operating Procedures for Toxic and Harmful Gas Detectors
When detecting toxic gases, we also have multiple gas detection technologies to choose from. At present, there is no technology that can quickly, inexpensively, and accurately solve the problem of detecting specific toxic gases. Therefore, when choosing suitable gas detection methods, we also need to consider and take into account various factors.
1. Colorimetric tube measurement technology
In addition to using toxic gas detectors, colorimetric tube technology is currently still 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 during measurement.
2. Electrochemical sensor
Electrochemical sensors are a common and relatively mature detection technology currently 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 lifespan.
3. Semiconductor sensors
Semiconductor sensors are detection elements made of metal oxides or materials that become metal semiconductor oxides. They can generate surface adsorption or reaction when interacting with gases, causing changes in conductivity, volt ampere characteristics, or surface potential characterized by carrier movement. It can be used to detect combustible gases at percentage concentrations, as well as toxic gases at ppm levels.
4. Ionization detector
The ionization detectors currently available on the market are divided into photoionization detectors (PID) and flame ionization detectors (FID), which are commonly used toxic gas detectors on gas phase detectors. Separating these two sensors into instruments has become a commonly used detection method for detecting volatile organic compounds.
