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Rotary Piston Flowmeter PR Series

Download Files:

 FM-520 Manual de Usuario (SPA) 

FM-520 User's Manual (ENG) 

The rotary piston flowmeters FLOWMEET PR Series exhibit outstanding performance, particularly in oil and fuel applications. They are suitable for process plants and are distinguished by their minimal volumetric error (3 liters in 2000 liters), making them highly precise equipment in the market. They are virtually maintenance-free due to their non-metal-to-metal contact in moving parts, preventing degradation over time. These flowmeters feature a built-in deaerator and a mesh filter, and are certified as explosion-proof for classified areas.

                                 Models PR Series 
Model FM-040PR FM-050PR FM-080PR FM-100PR FM-150PR
Connection [inches] 1 y 1/2" BSP 2" BSP 3" BSP 4" BSP 6" BSP
Nominal Pressure[bar] 10 10 10 10 10
 Fluid Temperature Tmin/Tmax [°C] -40/70 -40/70 -40/70 -40/70 -40/70
Flow range [Ltr/min]  25/250 38/550 75/1150 130/1300  300/3000

Technical Data

  • The most accurate equipment for this type of application
  • Built-in deaerator (avoids false measurements due to the presence of air) 
  • Mesh filter (prevents the entry of solids or impurities that could damage the device's mechanism) 
  • Error less than 0.2% (3 liters in 2000 liters)
  • Repeatability: better than 0.05%
  • Low maintenance 
  • Very low pressure losses 
  • Pressure up to 10 bars


  • Fuel dispatch and receipt control
  • Measurement of edible oil production
  • Control of the history of oil consumption of engines, turbines
  • Fuel transfer volume measurement


Product Description

It is a positive displacement flowmeter for liquids. The primary sensor has a housing with two piston displacement rotors and a single central locking rotor, synchronized through three cylindrical cavities with a non-metal-to-metal contact with the measuring element. Each rotor is supported at each end by a bearing plate through which the rotor shafts project. The piston displacement rotors alternately move through the two half-cylinder cavities of the metering element, while the single locking rotor rotates within its cavity in such a way as to produce a continuous capillary seal between the upstream product and the measured product.At one end of each rotor shaft is a timing gear. The lock rotor gear, which has twice the number of teeth of each of the shift rotor gears, rotates at half the RPM of the shift rotors.