There are several types of body detectors. This is a distinction between a broad sense and a narrow sense. In a broad sense, gas detectors are divided into fixed gas detectors and portable gas detectors. The fixed gas detector, as its name implies, is a gas detector that is fixed in a certain place and cannot be moved. The portable gas detector refers to a gas detector that can be moved at any time and carried with you.
Types of gas detected by the gas detector:
1. Flammable and explosive gas: Flammable and explosive gas refers to the combustible gas that can burn in the atmosphere. The combustible gas is mixed in the corresponding combustion-supporting medium in a certain proportion, and can cause combustion or explosion under the action of the ignition source. Such gases mainly include hydrocarbons, halogenated hydrocarbons, alcohols, methyl acetate and other compound types of combustible gases and steam.
2. Poisonous and harmful gases: Poisonous and harmful gases refer to toxic chemicals that are gaseous or extremely volatile under normal temperature and pressure, and come from industrial pollution, the burning of coal and petroleum, and the decomposition of biological materials. Mainly include: carbon monoxide, vinyl chloride, hydrogen sulfide, chlorine, hydrogen cyanide, acrylic cyanide, nitrogen dioxide, benzene, ammonia, phosgene, phosgene, fluorine, hydrogen fluoride, arsine, bromine, bromination Hydrogen, germane, diborane, etc.
3. Asphyxiating gases: including carbon monoxide, hydrogen sulfide, hydrocyanic acid, carbon dioxide and other gases. After these compounds enter the body, they cause different tissues and cells to be hypoxic. Carbon monoxide mainly causes hemoglobin to lose its ability to carry oxygen, leading to hypoxia. Hydrogen cyanide directly acts on cytochrome oxidase, causing cells to be unable to take up and use oxygen. Methane has no obvious toxicity. It mainly reduces the oxygen concentration and causes hypoxic suffocation.
4. Irritating gases: including chlorine, phosgene, diphosgene, sulfur dioxide, ammonia oxide, formaldehyde, ammonia, ozone, etc. The characteristic of irritant gas on the body is that it has a strong stimulating effect on the skin and mucous membranes, some of which have a strong corrosive effect at the same time. The degree of irritant gas damage to the body is related to its solubility in water and the site of action.
Among the six common gases detected by gas detectors, oxygen is an oxidizer and a combustion aid; carbon dioxide and nitrogen oxides are poisonous and harmful gases; methane is a combustible and explosive gas; hydrogen sulfide and carbon monoxide are not only poisonous and harmful gases, but also combustible and inflammable. Explosive gas.
