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 Performance
The Ellipse® is Designed to Work Better
The PRESO ELLIPSE flow meter is designed with a series of ports facing the upstream velocity pressures and flow sensing ports strategically located ahead of the trailing-edge disturbances: As a result of its innovative design the ELLIPSE is capable of greater accuracy than a conventional sensor in measuring the actual DP signal. With the ELLIPSE, your measurement is absolutely precise and proportional to the actual flow rate.
Proven Superior
Extensive tests performed in recognized laboratories such as Alden Research, CEESI, NRC, etc., have demonstrated that the PRESO ELLIPSE exhibits accuracies ±0.75%. The ELLIPSE also achieved an impressive turndown ratio of 17:1. These flow meters are even FM approved for use as fire pump flow metering systems
Incomparable Advantages
When you look carefully at PRESO quality and performance you can clearly see where your advantage lies with the ELLIPSE.
The Ellipse Outperforms Them All
Compare and see for yourself!
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Ellipse Shape
- Flow boundary layers attached to the probe's surface, no separation effects on the low (static) pressure
- Turndown ratio of 17:1; no vacuum effects
- Very high repeatability
- No vortex generation
- Accuracy of ±0.75%
- Lowest drag coefficient (lowest pressure loss in the industry)
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Round Shape
- Low (static) pressure signal affected by separation
- Turndown ratio of 4:1; vacuum effects
- Variable intensity vortices generated behind (downstream), leading the probe to create signal amplifications, vibrations and acoustic problems
- Accuracy of ±1.5% to 3%
- High drag coefficient inducing high pressure loss
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Square Shape
- High vortices area resulting from the large bluff body obstructing the flow stream
- Turndown ratio of 10:1; vacuum effects
- Highest drag coefficient of existing pitot type probes (i.e. highest pressure loss)
- Claimed accuracy of ±1%
- Vibration and acoustic problems
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