The flow meter is one of the important instruments in the water, petrochemical and other industries, which can be compared with the eye of measurement. For the water conservancy industry, it is of special significance. For example, the addition of chemicals in the water supply industry, if the accuracy of the relevant metering instruments is not high, it will directly affect the quality of water quality, and even affect the safety and health of the user group!
At present, there are many types of flow meters, such as: volumetric flowmeter, turbine flowmeter, vortex flowmeter, differential pressure flowmeter, open channel flowmeter, electromagnetic flowmeter, ultrasonic flowmeter, mass flowmeter and so on. In the water conservancy and water pollution industry, we have roughly counted that the use scale of portable ultrasonic flowmeters and electromagnetic flowmeters is close to 85%, and the use of ultrasonic flowmeters has an upward trend with the development of its electronic technology.
Below, talk about the advantages and disadvantages of electromagnetic flowmeters and portable ultrasonic flowmeters, for reference only
An electromagnetic flowmeter is a flowmeter that works based on the law of electromagnetic induction (cutting magnetic field lines):
Its features:
1. High measurement accuracy and good repeatability,
2. The price is proportional to the size of the pipe diameter
3. The measured medium is required to have a certain conductivity
Features of Portable Ultrasonic Flowmeter:
1. No moving parts, no pressure loss
2. There is no requirement for the physical properties of the fluid
3. Non-contact measurement
4. The cost has nothing to do with the size of the pipe diameter
5. Easy to install, no need to stop
Many people think that the electromagnetic flowmeter is a non-contact measurement working method, or that the electromagnetic flowmeter has low requirements for the straight pipe section, which is wrong, and this misunderstanding is often at the cost of --- accuracy.
In practice, the accuracy of Fujifilm portable ultrasonic flowmeter can achieve an accuracy of 0.5%, and its many advantages will be gradually reflected in future industry applications. Of course, there are many people who will refute the many shortcomings of ultrasonic flowmeters, so I hope that everyone should clarify their application conditions when selecting models, and then choose the appropriate flow meter according to the working conditions. Choose a meter with different accuracy. Only an instrument that meets your actual work needs is a good instrument.
There are many brands of electromagnetic flowmeters, and generally their accuracy levels tend to be proportional to the price, and ultrasonic flowmeters are also divided into multiple levels of brands, and their corresponding accuracy and reliability are also very different. Therefore, in the selection process of instrumentation, it is necessary to take your actual needs as the basis.
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