How to choose a gas detector according to the environment
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 methane and other less toxic alkanes are in the majority, 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, rather than LEL detectors, 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.
Determine the use case:
Different industrial environments require different types of gas detectors.
A), fixed gas detector:
This is a detector that is widely used in industrial devices and production processes. Yiyang gas detectors can be installed on specific detection points to detect specific gas leaks. Yiyang fixed detector is generally two-body type, the detection head composed of sensor and transmitter is installed on the detection site as a whole, and the secondary instrument composed of circuit, power supply and display alarm device is installed in a single place as a whole, which is convenient for monitoring . Its detection principle is the same as that described 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, and at the same time, attention should be paid to installing them in the part where the specific gas is most likely to leak, such as choosing the most effective height for sensor installation according to the specific gravity of the gas, etc.
B), portable gas detector:
Yiyang portable instrument is easy to operate, small in size, and 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 Already adopting memoryless sickle hydrogen or carp ion battery), so that they can generally work continuously for nearly 12 hours, so, as this kind of instrument, it is more and more widely used in various factories and health departments.
If this type of instrument is used as an emergency 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 alarm accessories to avoid hearing the audible alarm in noisy environments, and install computer chips to record peak, STEL (15-minute short-term exposure level) and TWA (8-hour statistically weighted average value). ) provides specific guidance on worker health and safety.
