The choice of gas flowmeter should be considered from the following aspects

The thermal gas mass flowmeter adopts the principle of thermal diffusion, and thermal diffusion technology is a technology with excellent performance and high reliability under harsh conditions. Its typical sensing elements include two thermal resistances (platinum RTDs), one is a speed sensor and the other is a temperature sensor that automatically compensates for changes in gas temperature. When two RTDs are placed in a medium, where the speed sensor is heated to a constant temperature above ambient temperature, the other temperature sensor is used to sense the medium temperature. The gas mass flow through the velocity sensor is calculated from the amount of heat transfer through the sensing element. As the gas flow rate increases, the heat taken away by the medium increases. The temperature of the sensor is lowered accordingly. In order to keep the temperature constant, it is necessary to increase the operating current through the sensor, and the increased part of the current is proportional to the flow rate of the medium. The selection of gas flowmeter should be considered from the following aspects: 1. Accuracy grade: Generally speaking, the turbine flowmeter is selected mainly because of its high precision, but the higher the accuracy of the flowmeter, the more sensitive it is to changes in site conditions. Therefore, the accuracy of the instrument should be selected. Be cautious and think economically. 2. Flow range: The selection of the flow range of the turbine flowmeter has a great influence on its accuracy and service life, and each flowmeter has a certain measurement range. The choice of flowmeter diameter also depends on the flow range. . The principle of selecting the flow range is that the smaller flow rate should not be lower than the smaller flow rate allowed by the flowmeter when used, and the larger flow rate should not be higher than the larger flow rate allowed by the flowmeter when used. 3. Gas density: For gas turbine flowmeters, the influence of fluid properties is mainly the gas density, which has a great influence on the meter coefficient, mainly in the low flow area. If the gas density changes frequently, corrective action should be taken on the flow coefficient of the flowmeter. 4. Pressure loss: try to use a turbine flowmeter with small pressure loss. Because the pressure loss of the fluid through the turbine flowmeter is smaller, the less energy the fluid consumes from the input to the output pipeline, that is, the total power required will be reduced, thereby saving energy, reducing transportation costs, and improving utilization. . 5. Structure type: (1) The internal structure adopts reverse thrust turbine flowmeter. Because the reverse thrust device can make the impeller float within a certain flow range, there is no contact point in the axial direction, and there is no friction and wear on the end face, which can prolong the service life of the bearing. (2) According to the pipe connection method, the flowmeter has two installation methods: horizontal and vertical. There are flange connection, thread connection and clamp connection for horizontal installation and pipeline connection.

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