FLOW MEASUREMENT TECHNIQUES

• Rate meters ( inferential)• Constant area-variable head meter: venturi, flow nozzle,orifice plate and

pitot tube• Constant head- variable area meters: rotameter, cylinder and piston

arrangement• Variable head and variable area meters : Weirs and flumes• Variable velocity meters : current meters and anemometers• Variable force meter : Vane• Turbine meter – velocity of flow is proportional to rotor speed• Quantity meters ( positive)• Weight meter : weighers and traps• Volumetric meters: tank, rotating impellers

ANEMOMETER

HOT WIRE ANEMOMETER PROB(Flow - fluctuating and unsteady)

5 micron diameter wire of platinum tungsten-W bridge

HOT WIRE BRIDGE CIRCUITS

CURRENT METER

TURBINE METER

ELECTROMAGNETIC FLOW METER(Induced voltage E= CBLV)

c-dim const,B-magnetic field,L-length of conductor- dia of pipe,V- velocity of conductor i.e. fluid