Measurement Principle & Technical Description Considering 3 relative radius of the blade as shown, and a flat, turbulent flow profile. - At each point of the blade, the relative velocity is parallel to the blade angle. - The flow around the helical blade is uniform and continuous. - The hydraulic load on the blade is homogeneous. Removable cartridge Our two-blade monoblock impeller makes much of the difference. The helicoidal free running rotor lies axially in the meter body. Fluid flowing through the Heliflu™ TZN Flowmeters causes rotation at a speed directly proportional to the flow; each revolution corresponding to a precise and constant volume of throughput. Magnets mounted in the rotor induce electrical pulses in an adjacent pick-up coil. These are then processed by an electrical converter & displayed as a flow rate. A multi-blade turbine flowmeter is affected by viscosities due to the geometry of the blades. With a helical rotor, the flow velocity is parallel to the blade, whatever the position may be, - thanks to the length of the rotor, the flow profile is developed correctly, - the vortices at the end of the blade are minimized. The Heliflu™ Flowmeter has no sensitivity to density and a low sensitivity to viscosity. Performances relative to viscosity Viscosity or Product in cSt Bearing Type/ Material & Designs Flowrange for ± 0.25 % Linearity Flowrange at 0.15 % Linearity LPG or Gas Condensate Graphite Sleeves Tungsten Carbide Shafts 10 to 100 % 15 to 100 % 10 to 100 % 15 to 100 % 10 to 100 % 20 to 100 % 10 to 100 % 30 to 100 % 10/50 to 100 % according to viscosity 20/80 to 100 % according to viscosity Tungsten Carbide Bearings Tungsten Carbide Shafts VISC< 2 cSt* VISC = 2 or < 10 cSt VISC = 10 or < 20 cSt Above 20 cSt Performance Data on Request VISC = 20 to 300 cSt Above 300 cSt Performance Data on Request Repeatability ± 0.02 % for all Units R/R 0 = 1.0 R/R 0 = 0.7 R/R 0 = 0.2 Unique Helicoidal Main features Stainless Steel Bearing Supports Removable Calibrated 316L Stainless Steel Tube Tungsten Carbide Bearings ( Shafts and Sleeves) * Graphite bearings for some fluids with low viscosity.
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