How To Specify Liquid Flow Meters

Accurate, reliable, cost effective flow measurement is more important today than it has ever been. The years have seen many styles and grades of flowmeter developed, because the first problem in meter specification is to define what the measurement has to achieve. Dispensing a volume of juice concentrate to within 2% is a different problem to knowing and alarming when the cooling water flow drops to 50% of the desired flow, with a system shutdown operating at 25%. Both are different to measuring whisky or beer or petrol delivery in a financial transaction. This article presents one view of the different techniques that can be used for liquid measurement: it does not include every type of flowmeter on the market, just some of the more familiar ones.
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