The difference between electromagnetic flowmeter and ultrasonic flowmeter

Case introduction

Advantages and Disadvantages of Electromagnetic Flowmeter and Ultrasonic Flowmeter

Flow meter is one of the important instruments in water affairs, petrochemical and other industries. It can be compared with the eyes of measurement. It is of special significance to the water affairs and water conservancy industry. For example, the addition of pharmaceuticals in the water supply industry will directly affect the quality of the water and even affect the safety and health of users if the accuracy of the relevant measuring instruments is not high!

There are currently many types of flow meters, such as: volumetric flow meters, turbine flow meters, vortex flow meters, differential pressure flow meters, open channel flow meters, electromagnetic flow meters, electromagnetic flow meters, mass flow meters, etc. wait. We have made rough statistics in the water conservancy and water sewage industries, and the usage scale of ultrasonic flowmeters and electromagnetic flowmeters is close to 85%. Among them, the use of ultrasonic flowmeters has an upward trend with the development of its electronic technology. Below, let’s talk about the advantages and disadvantages of electromagnetic flowmeters and ultrasonic flowmeters for reference by peers. The electromagnetic flowmeter is a flowmeter that works based on the law of electromagnetic induction (cutting magnetic lines of force). Its characteristics are: 1. High measurement accuracy and good repeatability. 2. The price is proportional to the pipe diameter. 3. The measured medium is required to have a certain conductivity. Features of high-rate ultrasonic flowmeter: 1. No moving parts, no pressure loss 2. No requirements on the physical properties of the fluid 3. Non-contact measurement 4. The cost has nothing to do with the pipe diameter 5. Easy to install, no need to stop. Many people think that electromagnetic The flowmeter works in a non-contact measurement mode, or it is wrong to think that the electromagnetic flowmeter has low requirements for straight pipe sections. This wrong understanding is often at the expense of accuracy. In practice, the accuracy of ultrasonic flowmeters can already reach an accuracy of 0.5%, and many of its advantages will be gradually reflected in future industry applications. Of course, there are many people who will refute the many shortcomings of ultrasonic flow meters, so I hope everyone will clarify their application conditions when selecting models, and then choose the appropriate flow meter according to the working conditions. Choose instruments with different accuracies. Only instruments that meet your actual work needs are good instruments. There are many brands of electromagnetic flowmeters, and generally their accuracy levels tend to be directly proportional to their prices. Ultrasonic flowmeters are also divided into multiple levels of brands, and their corresponding accuracy and reliability also vary greatly. Therefore, in the selection process of instruments, you should base it on your actual needs.

Ultrasonic flowmeter is an instrument that measures flow by detecting the effect of fluid flow on ultrasonic beams (or ultrasonic pulses). It adopts multi-pulse technology, signal digital processing technology and error correction technology to make the flow meter more adaptable to the industrial site environment and make measurement more convenient, economical and accurate. Electromagnetic flowmeter is a new type of flow measurement instrument that developed rapidly with the development of electronic technology in the 1950s and 1960s. The electromagnetic flowmeter is an instrument that applies the principle of electromagnetic induction to measure the flow rate of conductive fluid based on the electromotive force induced when the conductive fluid passes through an external magnetic field.