Inflammable and explosive gases and toxic and harmful gases are always threatening people's health and safety in production work . In various production occasions , it is very important to choose the appropriate gas detection alarm for different gases to ensure people's safety. Here are some suggestions on .
According to the gas type and concentration range to be detected, the gas types encountered in each production department are different. If there are mostly methane and other less toxic alkanes, it is undoubtedly the most appropriate to choose the LEL Detector . Because the principle of the LEL Detector is simple and widely , 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, ethers, alcohols, fats, etc., you should choose a photoionization Detector instead of using LEL detection machine, as this could result in personal injury or death.
Choose according to different usage occasions
(1) Fixed gas detection alarm
This is a Detector that is widely used in industrial devices and production processes . It can be installed on a specific detection point to . The fixed Detector is generally a two-body type. The detection head composed of sensors and transmitters is installed on the detection site as a whole, and the secondary instrument composed of circuits, power supplies and display alarm devices is installed in a safe place as a whole, which is convenient for monitoring. They are more suitable for the characteristics of continuous and long-term stability required . 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 effective height of the sensor installation should be selected .
(2) Portable gas detection alarm
In open places, a portable diffusion gas Detector , 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. (3) Choose a pump-suction multi-gas detection alarm in a closed environment . If it enters a closed space, such as a reaction tank, storage tank or container, sewer or other underground pipelines, underground facilities, agricultural closed granaries, railway tankers, shipping Work places such as cargo holds and tunnels need to be tested before personnel enter, and the detection must be carried out outside the confined space. At this point, it is necessary to choose a multi-Gas Detector with a built-in sampling pump. Because the gas distribution and gas types in different parts (upper, middle and lower) in the confined space are very different. For example: the specific gravity of combustible gases in the general sense is relatively light , and most of them are distributed in the upper part of the confined space ; the lower part of the space. At the same time, oxygen concentration is also one of the types that need to be detected. In addition, if the volatilization and leakage of possible organic substances in the tank are considered, a Detector that can detect organic gases is also required. Therefore, a complete Gas Detector in a confined space should have a built-in pumping function—so that it can be detected in non-contact and sub-sites; it has a multi-gas detection function—to detect dangerous gases distributed in different spaces, including inorganic Gases and organic gases; Oxygen detection function - to prevent hypoxia or oxygen enrichment; Small size, portable instrument that does not affect workers' work. Only in this way can the staff entering the confined space be guaranteedof absolute security. In addition, after entering the confined space, the gas composition in it must be continuously detected to avoid changes in the concentration of volatile organic compounds or other toxic and harmful gases .
In actual use, gas detection alarms should be , in order to ensure production safety and personnel safety. (Author unit: Liaoyang Metrology and Testing Institute)
