Introduction to the difference between mass flowmeter and volume flowmeter

The difference between mass flowmeter and volume flowmeter is introduced. Mass flowmeter can directly measure mass flow, density dynamic detection, without compensation, and can also directly measure volume flow, while volume flowmeter can only directly measure volume flow. If you want to measure mass If the flow rate is given a fixed density value during configuration, the density cannot be dynamically detected, and the accuracy is poor. The mass flow meter is expensive, and the measurement is relatively accurate. The volume flow meter is cheap, but it can be converted between the two. If the unit If you don’t have money, try to choose the volume flow rate and convert it to mass flow rate on the software. The gas measured by the mass flow meter is not affected by temperature and pressure. The mass flow meter detects the density value in real time, so it has nothing to do with the temperature and pressure of the material. According to the principle of material conservation, the general process prefers to be judged by mass flow rate. Therefore, if the measuring points to be assessed need temperature and pressure compensation, liquid ones can be used appropriately. Therefore, the use of mass flow meters is better for instrumentation professionals, but the price is unacceptable. Moreover, the requirements for installation are relatively high. High-quality flowmeters use the principle of thermal diffusion. Thermal diffusion technology is a technology with excellent performance and high reliability under harsh conditions. Thermal mass flowmeters have two temperature sensors that are placed in the medium, one of which is heated to a temperature above the ambient temperature, and the other temperature sensor is used to sense the temperature of the medium. As the flow rate of the medium increases, the heat taken away by the medium increases, and the temperature difference between the two temperature sensors will change with the flow rate of the medium. According to the proportional relationship between the temperature difference and the flow rate of the medium, the flow rate Q of the fluid can be obtained. At present, most thermal mass flowmeters are used to measure gas, and only a small number of thermal mass flowmeters are used to measure tiny liquid flow.

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