Flow Measurement - Instrumentation Tools

Dall Tube Flow Meter – Principle, Advantages, Disadvantages

Dall tube is shortened version of Venturi meter, with a lower pressure drop than orifice plate. Flow rate is determined by measuring pressure drop.

V Cone flow meter is a differential pressure (DP) meter. These flow meters all work according to the same principle of DP flow sensors or devices.

When venturi flow meter is placed in a pipe carrying the fluid whose flow rate is to be measured, a pressure drop occurs across venturi meter.

A differential pressure flow meter works on the principle of partially obstructing the flow in the pipe and measures the flow rate based on DP.

Piston flow meters operate by a piston moving within a chamber of known volume. Piston meters are used for low volume flow measurements.

Rotary Abutment Flow Meters are another form of positive displacement flow meter. They have a wide viscosity range and maintains accuracy too.

Turbine flow meters use the rotation of a rotor within a flow tube to measure the flow of liquid. These are ideally suited for low viscosity liquids.

Oval Gear Flow Meters are a type of positive displacement meter. As liquid flows through the meter, a pair of oval shaped gears are forced to rotate.

In Differential Pressure Meters, obstructing flow is used to create a pressure drop. The flow rate is calculated using Bernoulli’s principle.

In Nutating disc flow meters, When fluid enters the chamber, it causes the disc to rotate and this is used to measure flow rate.