Detection methods for toxic gas detectors?
Toxic gas detectors are capable of detecting a wide range of toxic gases and are used in a variety of industries. In fact, when we use the poison gas detector for testing, we can choose a variety of testing methods.
1, colorimetric measurement skills
In addition to the use of toxic gas alarms, the colorimetric tube technology is a method for detecting toxic and harmful gases that are currently used in industrial environmental protection. The best DA of the DA of this measurement method based on the chemical color reaction is to compensate for the lack of suitable detection sensors encountered in the measurement of selected instruments.
2, electrochemical sensor
Electrochemical sensors are the most common and sophisticated testing techniques currently 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
A semiconductor sensor is a sensing element made of a metal oxide or a metal-semiconductor oxide material that is capable of surface adsorption or reaction when interacting with a gas, causing conductivity or volt-ampere characteristics or surface characterized by carrier motion. The potential changes. It can be used to detect flammable gases at percentage concentrations and can also be used to detect toxic gases in the ppm range.
4, ionization detector
The ionization detectors that can be seen on the market are divided into photoionization detectors (PID: PhotoIonizationDetector) and flame ionization detectors (FID: FlameIonizationDetector), which are the most widely used toxic gas detectors on gas chromatography instruments. The two sensors are made into instruments by themselves, which is the most commonly used detection method for detecting volatile organic compounds.