MM Pelton Wheel Flowmeters Litre Meter


Also known as a radial turbine the highly efficient Pelton Wheel meter has some major advantages. The very large blade area compared with the flow inlet port size produces an exceptionally wide range flowmeter which can measure very low flows. The flow through the inlet to the rotor chamber is accurately directed onto the rotor which rotates at a speed in linear proportion to the flow rate.

A small sensing coil detects the ferrites mounted in the rotor blade tips as they pass. No drag is imposed on the rotor which assists in the measurement of extremely low flows. Sapphire bearings provide a very low friction mechanically-robust bearing with long life characteristics. The Pelton Wheel is mounted across an orifice plate to produce linear measurement over larger flows. Due to the unique design characteristics of the Pelton Wheel there is a linear relationship between the frequency and flow rate over a wide range of up to 65:1.

12.5, 20, 25, 30, 37, 50, 75, 100, 150


Each size pelton wheel flowmeter has its flow rate range controlled by the connection and orifice size. For example, the MM20 has 3/4″ connections and a flow range of 2 to 130 litres per minute. The ring assembly with rotor is the same size irrespective of flow rate and connection size.

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  • Canning
  • Agricultural
  • Fuel
  • Chemicals
  • Batch Control
  • Mixing
  • Aerospace
  • Military
  • Low viscosity
  • Film Processing
  • Glass
  • Textile
  • Low Flow
  • Spraying
  • Automotive
  • Rubber & Plastic


Key Features

  • Compact wafer designs
  • Very Low Flow Measurement
  • Proven since 1975
  • Tolerant of particulate up to 100+ microns
  • Low pressure drop (<0.5 bar typical)
  • Single Moving Part
  • Wide Flow Range, up to 65:1
  • Low Maintenance
  • 35,000 installed
  • Highly Durable
  • Preserves Molecular Integrity of fluid


Technical Specifications MM range

Flow rates

MM12.5 65 l/min
MM20 130 l/min
MM25 160 l/min
MM30 220 l/min
MM37 350 l/min
MM50 500 l/min
MM62 800 l/min
MM75 1300 l/min
MM100 2200 l/min
MM150 5000 l/min


Accuracy ±2% of reading over top 90% of range
Repeatability ±0.2% reading over top 90% of range
Pressure Ratings 5 to 230 bar depending on material
Temperature rating -40°C - +100°C & 135°C dependent on material and pressure
Viscosity Range 0.5 to 10cP
Recommended Filtration A 100 micron filter is advisable for 100% long life serviceability.
Dimensions Refer to drawings

The ring assembly with rotor is the same size irrespective of flow rate and jet size.

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