The Pitot tube, placed in a flowing fluid, generates a differential pressure linked to the fluid's dynamic pressure, enabling flow measurement of liquids, gases or vapors using a primary element.
With their low pressure drop, Pitot tubes are ideal for gas, liquid and vapor measurements.
Flow measurement is calculated via the maximum velocity measurement. Pitot tube is placed at the centre of the pipe.
The shape speed depends on the number of the Raynolds. Velocity is equal to ± 2% and to maximum velocity x0,84 (this coefficient can be calculated with Vennard and Blasius’s formula) if the flow is turbulent. Pitot tube enables the measurement of this flowrate by generating a differential pressure proportional to the dynamic pressure of the fluid, when the pitot tube is placed in the flowing fluid.
The differential pressure generated is function of the axial velocity, fluid density and the characteristics of the probe (K0 factor of the probe).
This differential pressure is measured by a pressure transmitter FCX series differential connected to the HP and BP connections.
By adding an absolute pressure transmitter and a PT100 temperature sensor with a corrected flow rate calculator, the flow meter displays a mass flow rate and an analog output signal of the corrected volumetric flow rate.
GAS MEASUREMENTS
STEAM MEASUREMENTS
LIQUID MEASUREMENTS
Pitot tube - Flow measurement with primary element
ref : PITOT Discover
