Flow Meters manufactured in Britain
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Turbine Flow Meters

Turbine flow meters measure the velocity of a fluid using a rotating turbine in the flow stream. Some key features of turbine flow meters:

  • They contain a rotor with blades or impellers that spin as fluid passes through. The rotor spins proportionally to the velocity of the fluid.
  • The rotational speed of the rotor is detected by an electronic pickup, which generates pulses or signals proportional to flow rate.
  • They can measure both liquids and gases. Common applications include measuring water, fuels, and chemicals.
  • Turbine meters have a wide flow range and are suitable for clean or dirty fluids.
  • They provide highly accurate and repeatable flow measurements across a range of fluid viscosities and densities.
  • Turbine flow meters are versatile, accurate and reliable for measuring flow rate of liquids and gases.
What are Turbine Flow Meters

Turbine Meter Principles of Operation

The basic construction of turbine flow meters includes a bladed turbine rotor which is axially suspended in the pipe. As the fluid flows through the pipe, it causes the rotor to spin on its axis at a speed which is proportional to the
velocity of the fluid. The passage of each rotor blade is sensed a magnetic pickup installed on the outside of the meter body, in close proximity to the rotor.

The turbine meter is a popular displacement flow measuring device, which can be used in a wide range of industries for both liquids and gases. They are capable of measuring wide flow ranges with good accuracy at an economic price. Their application is restricted only by the fact that they must be used with clean, non-corrosive fluids.

Turbine Flow Meter Advantages

  • Wide flow rangeability including low flow rates
  • Turndown ratio generaly 100:1.
  • Good level of accuracy at an economic price
  • Simple, durable construction
  • Easy to install and maintain
  • Flexible connection to flow instruments for flow control
  • Wide variety of process connections (e.g. BSPP, NPT, Flange, RJT).
  • Turbine meters can operate over a wide range of temperatures and pressures
  • Low pressure drop across the turbine
  • Provides a convenient signal output
  • Wide range of sizes from DN12 up to DN150 as standard.

Turbine Flow Meters Limitations

  • Requires constant back pressure to prevent cavitation
  • Accuracy adversely affected by bubbles in liquids
  • They can only be used with clean liquids and gases (you may need to install a strainer upstream to prevent damage from particulates)
  • Not suitable for measuring corrosive fluids
  • Requires a turbulent flow profile (consistent fluid velocity across the pipe diameter) for accuracy
  • Sensitive to changes in fluid viscosity
  • Requires a straight run of pipe before and after the turbine meter to allow swirl patterns in the flow stream to dissipate
  • May not function properly with high viscosity fluids where the flow profile is laminar