The working principle and application classification of gas detectors
To ensure the personal safety of factory employees and save costs, factories can equip employees with multi-functional gas detectors that can be carried around for personal gas detection or placed in gas hazardous areas for area testing. Automatic alarm through the built-in sound and light alarm of the gas detector, timely reminder to ensure employee safety.
The principle and classification of gas detectors
A gas detector is an instrument that can detect the composition and concentration of various gases in the environment. Currently, there are many brands of gas detectors on the market, with a variety of categories. When choosing a gas detector, companies should pay more attention to choosing the gas detector that is suitable for themselves. Gas detectors mainly include portable gas detectors and fixed gas detectors, and the core technology of their gas detectors is sensor technology, The classification of gas detectors varies depending on the detection technology of gas sensors.
Gas sensors can be divided into four categories in principle:
(1) Electrical gas sensors, which use the electrical parameters of materials to change with gas concentration, can be divided into resistive and non resistive types. resistive gas sensors mainly include contact combustion type, thermal conductivity type, semiconductor gas sensors (also known as metal oxide semiconductor gas sensors and organic semiconductor gas sensors), etc, Non resistive gas sensors typically utilize the variation of material current or voltage with gas content.
(2) Optical gas sensors use the optical properties of gases to detect gas composition and concentration, which can be divided into infrared absorption, visible light absorption, light interference, chemiluminescence, test paper photoelectricity, photoionization, etc.
(3) Electrochemical sensor, made of polymer gas sensing materials, can be divided into: polymer resistance type, polymer dielectric type, and concentrated gas sensor, utilizing electrochemical properties.
(4) Polymer gas sensitive materials such as gas difference battery, surface acoustic wave, quartz oscillator, etc.
Commonly used gas detectors
A multifunctional gas detector is a type of gas detector that is widely used due to its ability to simultaneously detect multiple gases.
The multifunctional gas detector, as the name suggests, is an instrument used to detect the content of one or more gases in the environment. The detector uses natural diffusion to detect gases and uses electrochemical and combustion type gas sensors, which have excellent sensitivity and repeatability. The multifunctional gas detector can detect four gases: oxygen, combustible gas, carbon monoxide, and hydrogen sulfide, and can store up to 130000 detection data, With the software, historical data can be viewed at any time.
Whether it is a gas detector or a multifunctional gas detector, we must pay attention to the following precautions when using it:
1. Avoid being subjected to strong impact and compression during use;
2. Charging should be carried out in a safe area, and it is strictly prohibited to charge in flammable and explosive hazardous areas;
3. Maintenance should be carried out by specialized personnel or institutions. During maintenance, the model, specifications, and parameters of the original circuit components must not be changed;
4. Please use the manufacturer's dedicated charger when charging;
5. Do not squeeze the display screen with your hands;
6. When the gas concentration is too high, it will have adverse effects on the electrochemical sensor of the instrument or damage the sensor;
7. When the battery level is low, the buzzer emits a "beep, beep" sound prompt and automatically shuts down. Please charge before use.
Gas detectors have excellent sensitivity and repeatability, and can be used in industries such as petroleum, chemical, environmental protection, metallurgy, refining, gas transmission and distribution, biochemical medicine, agriculture, etc. for real-time detection of environments containing explosive gases such as combustible gas or toxic gases such as carbon monoxide, hydrogen sulfide, and oxygen. In dangerous environments, safety is no small matter, and prevention is necessary. We need to maintain a 120% spirit, ensure that there are no harmful gas leaks on site, and ensure safe production.
