The key questions which need to be answered before selecting a rotameter are:
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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 temperature?
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What is the size of the pipe?
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Would you like a direct reading rotameter or is a look up table acceptable?
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What accuracy do you need?
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Do you require a valve to regulate the flow?
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Will there be back pressure?
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What is the maximum process pressure?