Venturi Tube for Flow Measurement

Venturi Tube is also a very popular primary sensing element for flowmeasurement. It is mostly used for low pressure flow measurement like gas, air etc flow. If we compare it with the Orifice Plate, it works on the same principle but is a very precise form of it. In the same way Orifice Plate can be called the raw form of a venturi tube.
The basic working principle of both of them is exactly the same i.e, differential pressure.