The important instruments used to measure flow have been listed below:
Secondary or rate meters
Head Type Flow Meters
Obstruction meters
● Orifice meter
● Flow nozzle
● Venturi meter
● Rota meter (variable area meter)
Pitot tube (Total Pressure Probe)
Special Methods
● Magnetic flow meter
● Ultrasonic flow meter (travel time difference method and the oscillating loop system)
● Turbine type anemometer or turbine meter
● Hot Wire anemometer (constant current and constant temperature methods)