Full definition
Instrument measuring volumetric or mass flow rate of a fluid. Types: turbine (velocity, ±0.5-1% accuracy), electromagnetic (conductive liquids, no pressure drop), ultrasonic (non-invasive, clamp-on), Coriolis (mass flow, ±0.1%), vortex (gas and steam), thermal mass (gases, low flows). Selection criteria: fluid type, range, temperature, viscosity, required accuracy. Outputs: 4-20 mA, pulse, HART, Profibus. Standard ISO 9951. Brands: Endress+Hauser, Krohne, ABB, Yokogawa, Bürkert.