Working principle of U-shaped flowmeter | Working principle of indirect mass flowmeter

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1. Working principle of mass flowmeter

The working principle of mass flowmeter is based on thermal sensing measurement, which measures the flow rate by the molecular weight carried away by the separated molecules. This measurement method will not be affected by changes in gas temperature and pressure, so mass flow meters can provide accurate, fast, reliable, efficient, stable, and flexible flow measurement. Specifically, mass flow meters are mainly divided into several types, including thermal mass flow meters, differential pressure mass flow meters, and Coriolis mass flow meters, each with their own characteristics in terms of working principles. A thermal mass flowmeter uses an external heat source to heat the gas being measured inside the pipeline, and calculates the mass flow rate of the gas by measuring the change in heat generated by the flow of gas inside the pipeline. This type of flowmeter typically includes two reference stage thermistors, one is a velocity sensor for heating, and the other is a temperature sensor for measuring changes in gas temperature. As the gas flow rate increases, more heat is carried away, and the temperature of the temperature sensor will decrease. The temperature change value is linearly proportional to the mass flow rate of the gas, so the mass flow rate of the gas can be calculated. Differential pressure mass flowmeter is based on the Poissons law, which calculates the volumetric flow rate of gas by measuring the pressure difference before and after passing through a certain section of pipeline, and then converts it to the mass flow rate under standard operating conditions. This type of flowmeter requires the measured gas to undergo laminar flow, so it is usually maintaine

d by passing the gas through a stack of laminar flow sheets. By measuring the pressure difference between the two ends of the laminar flow sheet, the gas flow rate can be calculated to be large and the pressure inside the chamber can be small. The Coriolis mass flowmeter drives the vibration of the straight pipe section by slightly vibrating the bent ends of two parallel U-shaped pipes. When gas flows through, the pipeline forces the gas to vibrate together, and in order to resist this forced vibration, the gas generates a reactive force, known as the Coriolis force. This force will cause the vibration of the two pipelines to be asynchronous, resulting in differences. By detecting the magnitude of this difference through the circuit, the mass flow rate of gas passing through the pipeline can be calculated. In general, mass flow meters measure the mass flow rate of fluids through different physical principles and have a wide range of applications, such as petrochemical, chemical, metallurgical, energy, environmental protection and other industries. They can accurately measure the mass flow rate of fluids, providing important parameter support for industrial production and processing processes.

2. Working principle of indirect mass flowmeter

The indirect mass flowmeter works based on the principle of Coriolis force, and directly obtains the mass flow rate by measuring the phase difference or frequency change of the chain sock generated by the fluid in the vibrating tube.

. The core principle of an indirect mass flowmeter (Coriolis mass flowmeter) is to allow fluid to flow through one or a group of vibrating measuring tubes. When there is no fluid flow, the measuring tube vibrates up and down but maintains

Working principle of U-shaped flowmeter | Working principle of indirect mass flowmeter

1. Working principle of mass flowmeter

2. Working principle of indirect mass flowmeter

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