Several detection methods commonly used in toxic and harmful gas detectors
Toxic and harmful gases pollute the workshop air in the form of gas, steam, mist, smoke and dust during the production process. Health status, poisoning environment, and labor intensity are related. Personnel shall be equipped with toxic gas detectors for detecting toxic and harmful gases during operation.
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 specific toxic gas detection, so when we choose a suitable toxic gas detection method, we also need to consider and take into account various the elements of.
1. Colorimetric tube measurement technology
In addition to the use of toxic gas alarms, colorimetric tube technology is currently used in industrial environmental protection to detect toxic and harmful gases. The advantage of this measurement method based on chemical chromogenic reaction is that it can make up for the lack of suitable detection sensors encountered in instrument measurement.
2. Electrochemical sensor
Electrochemical sensors are currently a common and mature detection technology used in portable gas detectors to detect toxic and harmful gases. Electrochemical sensors are characterized by small size, low power consumption, good linearity and repeatability, and long life.
3. Semiconductor sensor
Semiconductor sensors are detection elements made of metal oxide or metal semiconductor oxide materials, which can produce surface adsorption or reaction when interacting with gas, causing conductivity or volt-ampere characteristics or surface characteristics characterized by carrier movement. Potential changes. It can be used to detect flammable gases in percentage concentration, and can also be used to detect toxic gases in ppm level.
4. Ionization detector
The ionization detectors that can be seen on the market are divided into photoionization detectors and flame ionization detectors, which are toxic gas detectors commonly used in gas chromatography instruments. These two sensors are made into instruments separately, just It has become a commonly used detection method to solve the detection of volatile organic compounds.
