Selection and types of gas detectors
The gas detector is one of the most commonly used detection instruments in industrial production. It can detect the concentration of toxic and harmful substances in our work. The gas detector can detect the types of gases existing in the environment. According to the detection results, use the corresponding Safety protective equipment.
When using a gas detector, you must pay attention to the use environment. There are many factors that can affect the detection results of the gas detector, such as changes in humidity and temperature.
Changes in temperature affect the amount of oxygen actually present in the atmosphere. If the temperature in the working space fluctuates greatly, the detection results of the gas detector may drift. impact on the outcome.
If the air humidity in the working space increases, the water vapor in the air will drive away the oxygen, which may cause the oxygen reading to drop. This effect will not be noticed immediately, but it will gradually affect the degree of oxygen after several hours and affect the test results. .
Therefore, when we inspect the air, we should pay attention to the temperature and humidity of the air in the working air in order to adjust the detector.
Confirm the type and concentration range of the gas to be detected
Every production sector encounters different types of gases. When choosing a gas detector, all possible situations must be considered. If there are a lot of methane and other less toxic alkanes, it is undoubtedly the most appropriate to choose an LEL detector. This is not only because the principle of the LEL detector is simple and widely used, but it also has the characteristics of convenient maintenance and calibration. If there are toxic gases such as carbon monoxide and hydrogen sulfide, it is necessary to choose a specific gas detector first to ensure the safety of workers. If there are more organic toxic and harmful gases, considering the low concentration that may cause personnel poisoning, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amines), ethers, alcohols, fats, etc., you should choose the light gas introduced in the previous chapter. Ionization detectors, and never with LEL detectors, as this could result in personal injury or death.
A) Fixed gas detector:
This is a detector that is widely used in industrial devices and production processes. It can be installed on a specific detection point to detect specific gas leaks. The fixed detector is generally a two-body type, which is used in conjunction with a gas transmitter and a gas control cabinet, and is installed in a safe place for easy monitoring. Its detection principle is the same as that mentioned in the previous section, but it is more suitable for the characteristics of continuous and long-term stability required by fixed detection in terms of process and technology. They should also be selected according to the type and concentration of the on-site gas. At the same time, attention should be paid to installing them in the part where the specific gas is most likely to leak. For example, the most effective height of the sensor installation should be selected according to the specific gravity of the gas.
B) Portable gas detector:
Because the portable instrument is easy to operate, small in size, and can be carried to different production sites, it is widely used in various factories and health departments as this type of instrument.
If this type of instrument is used as a safety alarm in an open place, such as an open workshop, a portable diffusion gas detector can be used because it can continuously, real-time, and accurately display the concentration of toxic and harmful gases on site. Some of these new instruments are also equipped with vibration alarms, using imported sensors, with good sensitivity and excellent repeatability; the instruments use embedded micro-control technology, the menu is simple to operate, complete functions, high reliability, and has a variety of self-adaptive Capability; broken code LCD display, intuitive and clear; compact and portable.
