How to choose suitable gas detectors in the different enviroment?
With the global industrialization and the development of new technologies and applications, toxic and harmful gases have been increasingly found in all kinds of industries and living environments. People may be unknowingly threatened by these poisonous and harmful gases. Therefore, how to accurately monitor and detect the existence and concentration of various toxic and harmful gases in various working and living environments is a problem we must face and consider now.
If in an open occasion, such as the open workshop, you can use the portable and diffuse gas detector, because it can continuously, real-time, accurately detect and display of the concentration of toxic and harmful gas. Some of these detectors are equipped with vibration alarm accessories - to prevent the sound alarm can not being heard in a noisy environment - and computer chips are installed to record peaks, STEL(15-minute short-term exposure level) and TWA(8-hour statistical weighted average)- to provide specific guidance for worker health and safety.
If entering a confined space, our common oxygen can also be regarded as a dangerous gas that causes danger, because a lack of oxygen may cause people to suffocate and die, while an excess of oxygen may accelerate or cause explosion or combustion.For example, reaction tank, storage tank or container, sewer or other underground pipelines, underground facilities, agricultural closed granary, railway tank, ship cargo compartment, tunnel and other work occasions, must be tested before the personnel entering, and to be tested outside the closed space. At this point, it is necessary to select a multi-gas detector with a built-in sampling pump.
Because the different parts of the confined space (upper, middle, lower) of the gas distribution and gas types are very different. For example, generally speaking, the proportion of combustible gas is relatively light, and most of them are distributed in the upper part of the confined space. Carbon monoxide and air are about the same specific gravity, generally distributed in the middle of the confined space; Heavier gases, such as hydrogen sulfide, exist in the lower part of the confined space. Oxygen concentration is also one of the types that must be measured.
Moreover, if the possibility of organic matter volatilization and leakage in the tank is taken into consideration, an organic gas alarm that can be detected is also needed.
Therefore, a complete closed space gas detector should be one with a built-in pump function -- so that it can be non-contact, partial detection; Multi-gas detection function - to detect different spatial distribution of hazardous gases, including inorganic and organic gases; It has the function of oxygen detection -- preventing hypoxia or oxygen enrichment; Small size, not affect the work of workers portable instrument. Only in this way can the absolute safety of workers entering confined Spaces be guaranteed.After entering the confined space, it is necessary to continuously test the gas composition in order to avoid the change in concentration of volatile organic compounds or other toxic and harmful gases caused by personnel entry, sudden leakage, temperature and other changes.
For emergency, leak detection and inspection purposes, pump-type detector with short response times, high sensitivity and resolution should be used so that the location of the leak can be easily determined.