Preso Meters”Ellipse flowmeter has a patented elliptical design with aerodynamiccharacteristics that prevents loss of accuracy caused by fluidseparation at the sensor body. The flowmeter is designed with a seriesof ports facing the upstream velocity pressures and flow sensing portsstrategically located ahead of the trailing-edge flow separation. As aresult of this design, the flowmeter is capable of greater accuracythan a conventional sensor in measuring the actualdifferential-pressure (DP) signal. It obtains +/- 3/4 percent accuracyof readings and a repeatability of +/- 0.1 percent of readings. It alsoachieved an impressive turndown ratio of 17-to-1 with no vacuumeffects. The flowmeter offers energy savings, easy installation, andlong-term repeatability in a variety of applications. The flowmeterfeatures airfoil characteristics that offer very low permanent pressureloss and eliminates noise transmission.