variable-area flow meter / for gas / for liquids / precision
FR-R, FPL-R Riels Instruments



  • Technology:


  • Fluid:

    for gas, for liquids

  • Other characteristics:

    precision, direct-reading, plastic tube, in metering tube, stainless steel

  • Process pressure:

    10 bar (145.04 psi)

  • Process temperature:

    70 °C (158 °F)

  • Volumetric flow rate:

    2,000 l/h (528.3 us gal/h)


The FR-R and the FPL-R are instant flow measuring devices which are mainly used to measure low, medium and high flow rates of any fluid type even if it is corrosive or an acid fluid. They measure, given that the pressure and the temperature are following the limitations of the glass tube. These devices measure efficiently and accurately in accordance with the scale provided in the tube. The Flowmeters are completely made with Plexiglas with floating measuring made with various types of materials such as AISI316, Hastelloj or PVC (aggressive liquids).