The Alfa Laval flow meter consists of a vertically oriented tapered glass metering tube with a larger end at the top and a metering float that is free to move within the tube.


A metering float rises in the tube in proportion to the fluid flow. The height of the float is an indication of the flow rate, and readings are taken from the scale on the metering tube. The scale indicates the fluid flow as a percentage of maximum flow (100% = max. flow). Different metering floats may be used within the same flow meter, thus making it possible to use the flow meter to measure several different flow ranges.