If confined space, such as reaction tanks, storage tanks or containers, sewers or other underground pipelines, underground facilities, agricultural closed granaries, railway tank cars, shipping cargo holds, tunnels, etc., inspections must be carried out before personnel enters , And to be tested outside the confined space. In this case, you must choose a multi-gas alarm 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: In general, the specific gravity of combustible gases is relatively light. Most of them are distributed in confined spaces. The specific gravity of carbon monoxide is similar to that of air. They are generally distributed in confined spaces, while heavier gases such as hydrogen sulfide exist in confined spaces. The lower part of the space.
Oxygen concentration is also one of the types that must be detected. If the volatilization and leakage of organic substances in the tank is considered, a detector that can detect organic gases is also needed. Therefore, a complete confined space gas alarm should be one with built-in pumping function so that it can be non-contact, sub-site detection with multi-gas detection function to detect dangerous gases in different spatial distributions, including inorganic gas and organic gas, with oxygen detection function It is a portable instrument that prevents hypoxia or fertility and is small in size and does not affect the work of workers. The gas components are continuously tested to avoid changes in the concentration of volatile organic compounds or other toxic and harmful gases due to personnel entry, sudden leakage, and temperature changes. Only in this way can the absolute safety of staff entering the confined space be guaranteed.
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