8. Fluid flow sensors and meters

The measurement principles are as follows:

• differential pressure flowmeters or flowmeters with depressurizing elements (figure 26 ): these systems are standardized;

• Pitot probe flow measurement (figure 27 );

• turbine flowmeter (figure 28 );

• paddle-wheel flowmeter (figure 29 ), with external displacement measurement;

• vortex flowmeter (figure