Electromagnetic flow meters utilize Faraday's Law of Electromagnetic Induction to measure the flow of liquids and require that the piping material be electrically conductive and have an appropriate magnetic permeability.
1. Working principle of electromagnetic flowmeter
Electromagnetic flowmeter is an instrument that measures liquid flow based on Faraday's law of electromagnetic induction. When the liquid flows through the conductive pipe, a voltage difference is generated between the electrodes in the liquid. The flow rate of the liquid can be measured based on the voltage difference. Therefore, electromagnetic flowmeters have strict requirements on pipe materials.
2. Requirements for pipeline materials
1. Electrical conductivity
Since the electromagnetic flowmeter measures the flow rate by measuring the voltage difference of the liquid in the pipeline, so The pipe material must have certain conductive properties, otherwise measurement cannot be performed. Commonly used pipe materials include carbon steel, stainless steel, copper, aluminum, etc. They all have certain conductive properties and can be used as pipe materials for electromagnetic flowmeters.
2. Magnetic permeability
In addition to certain electrical conductivity, the magnetic permeability of the pipe material is also very important. Since the liquid generates a magnetic field when it moves, if the magnetic permeability of the pipe material is too low, it will affect the measurement accuracy of the electromagnetic flowmeter. Among commonly used pipe materials, the magnetic permeability of stainless steel is relatively low. It is recommended to use an electromagnetic flowmeter with high magnetic induction intensity when using stainless steel pipes.
3. Application of pipelines of different materials
Since pipelines of different materials have different conductivity, magnetic permeability and other characteristics, it is necessary to select different pipeline materials when using electromagnetic flowmeters. . Generally speaking, pipes made of carbon steel, copper, aluminum and other materials can be measured with ordinary electromagnetic flowmeters, while stainless steel pipes require electromagnetic flowmeters with high magnetic induction intensity.
In addition, attention should also be paid to the inner diameter and wall thickness of the pipe. Only when the inner diameter and wall thickness of the pipeline meet certain conditions can the electromagnetic flowmeter achieve its best measurement effect.
Hangzhou Economic Development Area，Hangzhou 310018，China
