What are the various methods to measure level ,pressure and flow

Question

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Answer 1

level

     sight glass

     float type

     differential pressure type

     resistence type and capacitance type.

pressure

      manometer,strain gauge,piezo electric sensor,piezo resistive sensor,force balance.

flow

      electro magnetic flow meter, venturi tube,o*****e plate,rotameter,sonic flow metere

Answer 2

level measurement, as in level of liquid in a tank, will depend on the fluid you are measuring and the amount:

weight

float

optical transducer

sonic transducer

Pressure measurement varies widely, and the best method depends on what fluid you are measuring. Gas pressure is simple to measure, liquid pressure slightly less so.

Manometer

bourdon-tube pressure gage

pressure transducer

Flow measurement is pretty varied and really depends on the fluid - some most common methods:

o*****e pressure drop

rotameter

thermal flow meter

rotor flow meter

corriolis flow meter

Neutating flow meter (and a variety of constant displacement types such as piston and s***w flow meters)

Doppler effect flow meter (sonic)