Selection Guide for Gas Detectors
We can choose the detector that suits us from the following points:
1. 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.
1. Most of methane and other less toxic alkanes, it is undoubtedly the most suitable to choose 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.
2. 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.
3. Most of them are organic poisonous and harmful gases. Considering that the concentration of them may cause personnel poisoning is relatively low, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amine), ether, alcohol, fat, etc., you should choose the gas introduced in the previous chapter. use a photoionization detector instead of an LEL detector as this could result in personal injury or death.
If the gas types cover the above types of gases, choosing a composite gas detector may achieve twice the result with half the effort.
2. Determine the occasion of use:
Different industrial environments require different types of gas detectors.
1. 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. The detection head composed of a sensor and a transmitter is installed on the detection site as a whole, and the secondary instrument composed of a circuit, power supply and display alarm device is installed in a safe place as a whole, which is convenient for monitoring. Its detection principle 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 most likely place for a specific gas to leak. For example, the most effective height for sensor installation should be selected according to the specific gravity of the gas.
2. Portable gas detector:
Because the portable instrument is easy to operate and small in size, it can be carried to different production sites. The electrochemical detector is powered by alkaline batteries and can be used continuously for 1000 hours; the new LEL detector, PID and composite instruments use rechargeable batteries (some have been Using memoryless Ni-MH or lithium-ion batteries), they can generally work continuously for nearly 12 hours. Therefore, as such instruments, they are more and more widely used in various factories and health departments.
For various production occasions and testing requirements, choosing the right gas detector is a must for every person engaged in safety and hygiene work. And choosing a suitable gas detector will also make the detection achieve twice the result with half the effort.
