The key questions which need to be answered before selecting a magnetic flowmeter are:
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Is the fluid conductive or water based?
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Is the fluid or slurry abrasive?
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Do you require an integral display or remote display?
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Do you require an analog output?
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What is the minimum and maximum flow rate for the flow meter?
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What is the minimum and maximum process pressure?
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What is the minimum and maximum process temperature?
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Is the fluid chemically compatible with the flow meter wetted parts?
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What is the size of the pipe?
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Is the pipe always full?