The Pitot tube measures the flow velocity of a fluid by comparing the total pressure with the static pressure. The difference between these two pressures, measured by a pressure transmitter differential, is used to determine the velocity using Bernoulli's equation. This flowmeter with depressurizing element can be used to measure the flow of liquid, gas, biogas or steam.
Easy, cost-effective installation of your speed measurements
With their low pressure drop, Pitot tubes are ideal for measuring gas and biogas flow, liquid flow and vapor flow.
Fuji Electric France, French manufacturer of Pitot tubes, offers two technologies:
Ideal for simple speed measurement applications for pipe diameters from 50 to 3000 mm
Annubar ® equivalent, the perfect speed meter for your advanced applications for pipe diameters from 50 to 1500 mm
Henri Pitot invented the Pitot tube, an essential flow-measuring instrument in aeronautics, hydraulics, meteorology, Formula 1 cars, most aircraft and, of course, industry.
Pitot tube flow measurement is based on a velocity field exploration method ("measurement of velocity at a number of points in the flow cross-section to determine the average velocity, taking into account the area covered by each measurement point", according to AFNOR standard X10 112).
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.
Measurement accuracy is equal to ±2% at max. velocity x0.84 (this coefficient can also be calculated using the Vennard and Blasius formulas) if the flow is turbulent.
The Pitot tube provides deprimogenic flow measurement by generating a differential pressure proportional to the dynamic pressure of the fluid when placed in the flowing fluid. The Pitot tube is oriented at right angles to the direction of air flow, to measure static and total pressure.
This differential pressure is measured by the pressure transmitter differential connected to the Pitot tube's high-pressure (HP) and low-pressure (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 AND BIOGAS FLOW MEASUREMENT
STEAM FLOW MEASUREMENT
LIQUID FLOW MEASUREMENT
Pitot tube - Flow measurement with primary element
ref : PITOT Discover
