The harmful gases in the tunnel are mainly methane, carbon monoxide, carbon dioxide, hydrogen sulfide, sulfur dioxide, ammonia, nitrogen dioxide, nitrogen oxides, etc., and different production occasions have different detection requirements, choosing the right gas detector is every person engaged in safety and production work must pay great attention to. So how do we choose the right toxic and harmful gas detector to detect these toxic gases in the tunnel?
First, we need to determine the type and concentration range of the detected gas;
If methane and other less toxic alkanes are predominant, it is recommended to preferentially select a combustible gas detector. If there are toxic gases such as carbon monoxide and hydrogen sulfide, it is recommended to preferentially select a specific gas detector to ensure the safety of the staff. If it is more organic toxic and harmful gases, considering that the concentration of human poisoning may be lower, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amine), ethers, alcohols, esters, etc., it is recommended to give priority to photoion detectors, but absolutely do not use combustible gas detectors to avoid casualties.
If the place is covered by multiple types of gas, it is recommended that you choose a compound gas detector, which may achieve twice the effect with half the effort.
Secondly, it is necessary to determine the occasion in which the detector is used;
The industrial detection environment is different, and the type of gas detector is different.
There are stationary gas detectors that can be installed at specific detection points to detect specific gas leaks. The fixed detector is generally two-type, with sensors and transformers and portable gas detectors, small size, easy to carry, with the open, in all kinds of factories and health departments are more and more widely used.
If it is an open occasion, we can use a portable diffused gas detector. If it is a confined space, such as reaction tanks, storage tanks or containers, sewers or other underground pipes, underground facilities, tunnels and other workplaces, it must be tested before personnel enter, and it must be tested outside the confined space. At this point, a multi-gas detector with a built-in sampling pump must be selected.
In addition, after entering the confined space, the gas composition should be continuously tested to avoid changes in the concentration of volatile organic compounds or other toxic and harmful gases caused by personnel entry, sudden leakage, temperature and other changes.
If used for emergency, leak detection and inspection, it should be pumped, short response time, sensitivity and resolution of the instrument, so that the orientation of the leak point can be easily.
With the development of innovation, portable multiple detectors are also a better choice for us. It is small in size, light in weight, fast in response, can detect a variety of gases at the same time, and is more convenient to use.