G PHYSICS
G01 MEASURING; TESTING
G01F MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1/00 Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
G01F1/56 by using electric or magnetic effects
G01F1/58 by electromagnetic flowmeters