KROHNE TIDALFLUX IFM 4110 PF EN - Manual (Page 76)

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12 Measuring principle
The TIDALFLUX IFM 4110 PF is an electromagnetic flowmeter with an integrated capacitive level measurement system,
designed for electrically conductive process liquids.
The flow rate Q(t) through the tube is: Q(t) = v x A
v = flow velocity of liquid product
A = wetted area of tube section.
Flow velocity v is determined on the basis of the known electromagnetic measurement principle. The two measuring
electrodes are located in the lower part of the measuring tube, on a level of approx. 0.1 x inside tube diameter in order to get a
reliable measurement down to a level of 10%.
The wetted area A is computed from the known inside diameter of the tube by the patented capacitive level measurement
system that is built into the measuring tube liner. The required electronics unit is accommodated in a compact housing that is
mounted on top of the primary head. Communicating with the separate IFC 110 PF converter is by way of an RS485
interface.