Suggestion for purchasing gas detectors
1) Confirm the type and concentration range of the gas to be tested:
The types of gases encountered by each production department are different. When choosing a gas detector, it is important to consider all possible scenarios. If methane and other less toxic alkanes are predominant, choosing an LEL detector is undoubtedly the most appropriate option. This is not only because the LEL detector has a simple principle and wide application, but also has the characteristics of convenient maintenance and calibration. If there are toxic gases such as carbon monoxide and hydrogen sulfide, priority should be given to selecting a specific gas detector to ensure the safety of workers. If there are more organic toxic and harmful gases, considering the low concentration that may cause personal poisoning, such as Aromatic hydrocarbon, halogenated hydrocarbon, ammonia (amine), ether, alcohol, grease, etc., you should choose the Photoionization detector introduced in the previous chapter, rather than the LEL detector, because it may cause casualties. If the types of gases cover the above categories, choosing a composite gas detector may achieve twice the result with half the effort.
2) Determine the usage situation:
The selection of gas detectors varies depending on the industrial environment.
A) Fixed gas detector:
This is a commonly used detector in industrial installations and production processes. It can be installed at specific detection points to detect specific gas leaks. The Yiyang fixed detector is generally a two body type, with a detection head composed of a sensor and a transmission installed on the detection site. The secondary instrument consisting of a circuit, power supply, and display alarm device is installed in a public place for easy monitoring. Its detection principle is the same as described in the previous section, but it is more suitable for the continuous, long-term stability and other characteristics required for fixed detection in terms of process and technology. They should also be selected based on the type and concentration of on-site gas, and attention should be paid to installing them in specific areas where gas leakage may occur, such as selecting the most effective height for sensor installation based on the specific gravity of the gas, and so on.
B) Portable gas detector:
As the portable instrument is easy to operate and compact, it can be carried to different production parts. The Alkaline battery is used for power supply, and it can be used continuously for 1000 hours; The new LEL detectors, PID, and composite instruments use rechargeable batteries (some have already used memoryless nickel hydrogen or lithium-ion batteries), making them generally able to work continuously for nearly 12 hours. Therefore, their applications in various factories and health departments are becoming increasingly widespread.
C) Composite gas detector
The composite multi gas detector can be equipped with multiple gas detection sensors required on a single instrument, so it has the characteristics of small volume, light weight, fast response, and simultaneous display of multi gas concentration. More importantly, the price of the Yiyang composite multi gas detector is cheaper than that of multiple single diffusion gas detectors, and it is also more convenient to use. It should be noted that when selecting this type of detector, it is best to choose an instrument with separate switch functions for each sensor to prevent damage to one sensor from affecting the use of other sensors. Gas detection instruments are often used in environments where harmful gases can be generated and pose a threat to personal safety or may result in consequences. And gas detection instruments are indispensable for early prevention of environmental pollution and ensuring human life safety.
