Electromagnetic flow meter and Coriolis mass flow meter are the two most widely used types of modern flow meter. Each of them has its own advantages and limitations, so in actual applications, it is necessary to select the appropriate flow meter based on specific application scenarios and requirements.

1.Principle and application scope

An electromagnetic flow meter is a flow meter that calculates the flow rate by measuring the induced electromotive force generated by a magnetic field through a liquid or gas having a conductivity as a medium. Its advantage is that it can measure a variety of media, such as acid, alkali, salt water, sewage, etc., and can also work at higher temperatures and higher pressures. At the same time, the electromagnetic flow meter is not affected by the conditions of the medium in the pipeline, such as viscosity, density, etc., and has high accuracy, which can reach±0.5%~±1.0%. Therefore, electromagnetic flow meter are widely used in chemical, petroleum, pharmaceutical, metallurgical and other industries.

Coriolis mass flow meter is a flow meter based on thermophysical properties. It uses a heater to heat the fluid. After the fluid flows through the heater, it flows into the temperature sensor with a certain temperature difference. The flow rate is calculated based on the power provided by the heater and the temperature change detected by the temperature sensor. Because Coriolis mass flow meters calculate flow by directly measuring mass flow, they can accurately measure mass flow of gases and liquids. Its advantage is that it has high precision and can reach±0.1%~±0.5%, and is not affected by the pressure, density, viscosity and other factors of the medium. Because it is suitable for a variety of gases and liquids, it is widely used in chemical, pharmaceutical, food, semiconductor and other fields.

2. Analysis of advantages and disadvantages

The advantage of electromagnetic flow meter is that it has high precision, can be applied to a variety of media, is not affected by the state of the medium, and has high reliability and stability. However, electromagnetic flow meter have certain difficulties when measuring low-conductivity media, and when measuring large flow rates, they require larger volumes and higher-cost power supplies, which limits their application in certain situations.

The advantage of the Coriolis mass flow meter is that it can measure a variety of gases and liquids with high accuracy, not affected by the state of the medium, and has a wide measurement range, from small flow rates to large flow rates. In addition, the Coriolis mass flow meter has no dynamic flow components, so there is no pressure loss, which can greatly reduce the energy consumption of the system and is highly economical. Not only that, the Coriolis mass flow meter can also measure the density and temperature of gas and directly output the standard volume flow rate of the gas.

However, Coriolis mass flow meters also have some disadvantages. First of all, because the Coriolis mass flow meter uses a high-frequency oscillator, it is subject to large external interference such as temperature and pressure, and requires special technical means to compensate and correct, which increases complexity and cost. Secondly, Coriolis mass flow meters are prone to failure when measuring media with high temperature, high pressure, high viscosity and solid particles, and require special design to solve these problems.

3.Comparison of application scenarios  

Electromagnetic flow meter are mainly used for flow measurement in water, sewage, petroleum, chemical, steel, food, pharmaceutical and other industries, and are widely used in the field of industrial automation. Due to its high precision, good reliability, strong stability and other advantages, it is widely used in modern chemical, environmental protection, water treatment and other industries.

Coriolis mass flow meters are mainly used in flow measurement fields such as gas, steam and liquid, and are widely used in petroleum, chemical, pharmaceutical, food, semiconductor and other industries. Due to its high precision, wide measurement range, and good economy, it has been widely used in high-end fields.

To sum up, electromagnetic flow meter and Coriolis mass flow meter have their own advantages and disadvantages in different application scenarios. For occasions where the flow measurement accuracy is high, the medium state is stable, and the flow range is large, the use of electromagnetic flow meter should be given priority; for occasions where the medium state is unstable, the measurement range is wide, and economy and low energy consumption are required, the Coriolis mass flow meter should be given priority. In practical applications, it is necessary to comprehensively consider various factors according to the specific situation and choose the flow measurement equipment that suits you.