Copper sulfate flowmeter| electromagnetic meter

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1. Detection method for hydrogen

When burned in air, the flame appears light blue with a popping sound, and the only product produced is water. Hydrogen, a colorless and odorless gas, has reducibility. Hydrogen is an extremely flammable gas with an ignition point of only 574 ℃. It can burn at a volume fraction of 4% to 75% in air. The enthalpy of hydrogen combustion becomes -286 kJ/mol. Hydrogen gas is prone to detonation when mixed with air at concentrations ranging from 4.1% to 74.8%, or when excited at concentrations ranging from 18.3% to 59%. The ignition point of hydrogen is 500 ° C. A mixture of pure hydrogen and oxygen emits ultraviolet radiation when burned. Because hydrogen is lighter than air, its flame tends to rise rapidly, causing less harm than the combustion of hydrocarbons. Hydrogen reacts with all elemental oxidizing elements. Hydrogen can spontaneously react with chlorine gas (requiring light) at room temperature, and when mixed with fluorine gas in a cold and dark place, it can explode, generating potentially dangerous acid hydrogen chloride or hydrogen fluoride. Ignite pure hydrogen gas at the tip of the pointed tube and observe the color of the flame. Then cover a cold and dry beaker above the flame, and after a while, we can see that pure hydrogen gas is calmly burning in the air, producing a light blue flame (when hydrogen gas burns at the mouth of a glass tube, the flame is often slightly yellow). When covering the flame with a beaker, water droplets are generated on the beaker wall, and hands in contact with the beaker can feel hot. Hydrogen burns in the air, which is actually a chemical reaction between hydrogen and oxygen in the air, producing water and releasing a large amount of he

at. Extended information: Hydrogen is a colorless, odorless, non-toxic, flammable, and explosive gas. When mixed with fluorine, chlorine, oxygen, carbon monoxide, and air, there is a risk of explosion. Among them, the mixture of hydrogen and fluorine can spontaneously explode in low temperature and dark environments, and when mixed with chlorine at a volume ratio of 1:1, it can also explode under light. Hydrogen gas, due to its colorless and odorless nature, has a transparent flame during combustion, making its presence difficult to detect by the senses. In many cases, odorous ethanethiol is added to hydrogen gas to enhance olfactory perception and give color to the flame. Although hydrogen is non-toxic and physiologically inert to the human body, if the hydrogen content in the air increases, it will cause hypoxic asphyxia. Like all low-temperature liquids, direct contact with liquid hydrogen will cause frostbite. The overflow and sudden large-scale evaporation of liquid hydrogen can also cause environmental hypoxia, and may form explosive mixtures with air, leading to combustion and explosion accidents. Mixing with air can form explosive mixtures, which can explode when exposed to heat or open flames. Gas is lighter than air, and when used and stored indoors, leaks can rise and accumulate on the roof, making it difficult to discharge. Encountering sparks can trigger an explosion. Hydrogen reacts violently with halogens such as fluorine, chlorine, and bromine. Hydrogen, as a flammable compressed gas, should be stored in a cool and ventilated warehouse. The temperature inside the warehouse should not exceed 30 ℃. Stay away from sources of fire and heat. Protect from direct sunlight. It should be stored separately from oxy

Copper sulfate flowmeter

1. Detection method for hydrogen

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