List the Advantages and Disadvantages of a Magnetic Flow Meter used in industrial flow measurement.
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A magnetic flow meter provides an unobstructed flow path, so it causes a negligible pressure drop due to its pipe flow measurement function.
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The magnetic flow meter has a typical turndown ratio of 40:1, which means it can accurately measure a flow rate of as little as 1/40th of its maximum reading. This is higher than the turndown ratio for any of the other commonly used types of pipe flow meter.
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The typical accuracy for a magnetic flow meter is + 0.5 % of full scale. This is among the best of the various pipe flow meters.
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The effect of fluid viscosity on flow through a magnetic flow meter is essentially the same as for flow through the pipe itself.
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The magnetic flow meter can be used for pipe flow measurement of either clean or dirty liquids, including wastewater, corrosive liquids, or slurries.
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The cost of a magnetic flow meter is relatively high compared to other types of pipe flow meter.
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The magnetic flow meter is used primarily for liquids. It doesn’t work well for measurement of gas flow rate.
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In order to use a magnetic flow meter for measurement of a liquid’s flow rate, that liquid must be conductive. Hence it can’t be used for non-conductive fluids as mentioned above.