Flow measurement Operating Linearity 2-way
technology principle flow
Differential pressure Fluid mass self-acceleration,
potential-kinetic energy exchange √P (some)
Laminar Viscous fluid friction linear yes
Weirs & flumes Fluid mass self-acceleration,
potential-kinetic energy exchange Hn no
Turbine (velocity) Fluid velocity spinning
a vaned wheel linear yes
Vortex von K´arm´an effect linear no
Magnetic Electromagnetic induction linear yes
Ultrasonic Sound wave time-of-flight linear yes
Coriolis Fluid inertia,
Coriolis effect linear yes
Turbine (mass) Fluid inertia linear (some)
Thermal Convective cooling,
specific heat of fluid linear no
Positive displacement Movement of fixed volumes linear (some)