What is Turbine Flow Meter?

Flow Meter | Lora young

May 6, 2021

In turbine flow meters, a rotor or turbine is used as the measuring element which, located in the center of the flow of the current, rotates proportionally according to the speed of the fluid. The meter or register viewer assembled in the equipment, mechanically receives the rotation of the turbine, showing the instantaneous flow rate and the accumulated flow rate.

 

They are commonly used in agriculture and for industrial or municipal use, preferably in sprinkler or drip irrigation, central pivot irrigation, impulse and control pumps, water intakes from farms, water parks and sports areas, water plants. sewage, waste management, etc ...

 

Sino-Inst's simple design turbine flow meters with very few moving parts measure flow with great accuracy (± 2%), and with excellent repeatability (± 0.25%). One factor in the overall accuracy of the meter is called repeatability and is its ability to reproduce a measurement under similar conditions. These gauges usually work with constant pressures in the pipe, up to 10 Bar and there are also models that can work with a constant pressure in line of up to 20 Bar. They are easily installed both horizontally and vertically in all types of pipes, from diameter 50mm to diameter 250mm, thanks to the wide variety of sizes available and the pressure loss they generate is very low.

 

Installed vertically, for example in the riser of a Pivot, it offers slight advantages as gravity has a better flow conditioning effect on vertically oriented lines compared to horizontal lines.

 

Getting the most out of your Sino-Inst turbine gauge involves proper installation. Mechanical flow meters are velocity sensitive and vulnerable to potential upstream interruptions. It is an essential requirement to respect minimum distances of the straight conduction line before and after the meter, straight conduction sections in which there can be no obstruction such as pumps, valves, elbows, reductions or changes in diameter, etc ... These minimum distances are related with the diameter of the pipe in which the flow meter is installed.

 

Before reaching the turbine flow meter, the flow must run through a section of pipe in a straight line of at least five times the diameter of the pipe and after the meter, a linear flow conduction of at least once the diameter must be maintained. pipe diameter.

 

Special attention must be paid to pipelines that have two out-of-level elbows or a centrifugal sand separator, since the eddies they cause in the flow affect the turbine flow meters. In these cases, it is necessary to insert straightening vanes to break up the eddies.

 

The turbine is an important part of the flow meter, it has a curved helical shape and is calibrated in the laboratory. In addition, it is very light so that the impulse of the fluid is large in relation to the mass of the turbine and thus be able to measure low flows or detect changes in speed more quickly. It is rigid enough to maintain its shape during high flow conditions throughout the life of the meter.

 

Minimal in-line pressure is not required for turbine gauges to provide accurate measurement, but they are calibrated for a full pipe line, and are not reliable in pipes that are not completely full.

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Sino-Inst offers a variety of Turbine flow meters for flow measurement. If you have any questions, please contact our sales engineers.