How to quickly learn to select a gas detector
For various production occasions and detection requirements, choosing the appropriate gas detector is something that everyone engaged in safety and health work must pay great attention to.
Confirm the type and concentration range of gas to be detected:
The types of gases encountered in each production department are different. When choosing a gas detector it is important to consider all possible scenarios.
a. If there are mostly methane and other less toxic alkanes, it is undoubtedly most appropriate to choose the LEL detector. This is not only because the LEL detector has a simple principle and is widely used, but it also has the characteristics of convenient maintenance and calibration.
b. If toxic gases such as carbon monoxide and hydrogen sulfide are present, a specific gas detector must be selected first to ensure the safety of workers.
c. If there are more organic toxic and harmful gases, considering that the concentration that may cause human poisoning is low, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amines), ethers, alcohols, lipids, etc., you should choose the one introduced in the previous chapter. Do not cope with photoionization detectors using LEL detectors as this may result in casualties.
If the gas types cover the above categories of gases, choosing a composite gas detector may achieve twice the result with half the effort.
Determine the use occasion:
Different industrial environments require different types of gas detectors.
A) Fixed gas detector:
This is a detector commonly used in industrial equipment and production processes. It can be installed at specific detection points to detect specific gas leaks. Fixed detectors are generally two-piece. The detection head composed of sensors and transmitters is installed as a whole at the detection site. The secondary instrument composed of circuits, power supplies and display alarm devices is installed as a whole in a safe place for easy monitoring. Its detection principle is more suitable for the continuous and long-term stability required for fixed detection in terms of process and technology. They should also be selected according to the type and concentration of the gas on site. At the same time, attention should be paid to installing them in the parts where specific gases are most likely to leak. For example, the most effective height for sensor installation should be selected based on the specific gravity of the gas, etc.
B) Portable gas detector:
Because portable instruments are easy to operate and small in size, they can be carried to different production areas. The electrochemical detector is powered by alkaline batteries and can be used continuously for 1,000 hours; the new LEL detector, PID and composite instruments use rechargeable batteries (some have been Using memoryless nickel-metal hydride or lithium-ion batteries), they can generally work continuously for nearly 12 hours. Therefore, such instruments are increasingly used in various factories and health departments.
