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Advantages, Disadvantages, And Differences Of Mechanical Flow Meters And Magnetic Flow Meters (Part One Of Two)

Source: Siemens Industry, Inc
What Are The Advantages And Disadvantages Between A Mechanical Flow Meter And A Magnetic Flow Meter?

There has been a lot of discussion on using mechanical meters versus magnetic meters for the measurement of conductive liquid. While both flow meters offer benefits, is one more efficient and effective for you to use? The purchasing price is certainly a consideration, but it’s not the only thing that you should consider when looking at upgrading your system. 

What Are The Differences Between The Two Flow Meters? 
The primary difference between a mechanical meter and a magnetic meter is that a mechanical meter has moving parts and a mag meter doesn’t. Typical examples of mechanical meters are target meters, where liquid hits a spring loaded plate and the amount of movement of that plate relates to velocity, and turbine meters, where liquid flowing over a set of angled blades causes those blades to rotate and that velocity is used to determine flow rate. Another example would be a positive displacement (PD) or oval gear meter where a set amount of material moves through chambers and the amount of material that moves through these chambers as they rotate is counted and converted to flow rates. There are other mechanical designs, but you get the picture.

A mag meter works by having a conductive liquid flow through a lined flow tube and of the flow passing through a magnetic field generated as part of the flow tube design causes a voltage to be created. This voltage increases or decreases based on velocity. So, as long as the material meets the minimum conductivity level, there are no moving parts (mechanical motion) in the flow meter itself required to measure the flow rate through the meter.

Okay, now that we have a basic concept of each flow meter, what are the advantages and disadvantages?

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