Application and principle of gas flowmeter

A gas flow meter is a measuring instrument used for gas flow, which is mostly installed in pipelines to measure various chemical gases such as gas, natural gas, hydrogen, nitrogen, benzene, sulfur dioxide, methane, and hydrogen peroxide. A common gas flowmeter is a thermal gas flowmeter. This instrument can not only measure the gas flow, but also be used for process control together with other equipment, and it has a simple structure, high accuracy, and resistance Strong abrasiveness and other characteristics, so it has been widely used. The principle of gas flowmeter The thermal gas flowmeter mainly uses the principle of heat diffusion. The physical conditions of the thermal diffusion principle are mainly composed of two temperature-sensitive thermal resistors, one of which is used as a speed sensor and the other is used as a temperature sensor to realize the automatic compensation function for gas temperature changes. When the physical conditions are satisfied, the thermal gas flowmeter is in the normal working state. Once the gas flows through, the temperature sensor will increase or decrease its temperature to maintain the constant gas flow, so it can be controlled by the current in the circuit. The measurement of the gas is used to judge the flow rate of the gas. The faster the gas flow rate, the more heat it takes away, which reduces the temperature of the sensor. In order to keep the temperature constant, the current in the circuit increases; on the contrary, when the current in the circuit shows a decreasing trend, it indicates that the gas flow rate is also decreasing. The current presents a proportional relationship. Application of gas flowmeter The measurement of gas flow rate is actually applied in various fields. In terms of industrial production, the gas flowmeter can be used as a detection instrument for the process automation control system, and can also be used as a total meter for measuring the quantity of materials; Such as energy measurement, it is the only tool instrument in the process of energy management and economic accounting; in terms of environmental protection, it can be used for quantitative control of waste water and waste gas; in terms of biotechnology, it can be used for detection of blood, urine, etc.; in scientific experiments On the other hand, various measuring instruments are also required.

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have three basic components.