תוכן מרכזי בעמודדלג על תוכן מרכזי בעמוד

מדי זרימה מגנטי/אינדוקטיבי

What are Magmeters?

How they work, where they excel, advantages and limitations.

How they Work:

Magmeters go by many names: electromagnetic flow meters, magnetic flow meters, magnetic inductive flow meters, and magneto-inductive flow meters. They are by far one of the most popular flow measurement technologies in the world. As of 2020, one quarter of all flow meters sold are magmeters.

Magmeters operate according to Faraday’s law of magnetic induction where a current is induced into a conductor as it moves through a magnetic field. The amount of current is directly proportional to the velocity of the moving conductor.

Magmeters have many advantages, like no moving parts to wear, which makes them very reliable. Viscous and dirty liquids can also be measured with minimal accuracy degradation. They also offer low pressure loss and can be built with a variety of different materials to handle a variety of applications.

Conductive Liquids:

Conductive liquids are marked by the property of being able to conduct electricity. This is because there are positive and negatively charged ion particles that are free to move around. These ions enable the conductivity and the more ions there are, the higher the liquid’s conductivity will be. An increase in liquid temperature increases the activity in the ions and also increases the conductivity potential. It is typically measured in siemes per meter or centimeter.

Advantages:

Design has no obstruction or restriction
No moving parts to wear or break down
Reduced maintenance costs
Long service life
Use with clean, sanitary, dirty, corrisive, or abrasive media
Minimal straight run piping requirements
Easy to install in compact spaces
Accurate
Low pressure drop, reduced piping costs
Requires very little power to operate
Can measure both low and high flow rates
Can usually be bi-directional
Mostly insensitive to viscosity, specific gravity, temperature, or pressure variations