How to choose the right sensor?
To measure open channel flow by height/flow ratio, several technologies are available to you: ultrasound, radar or hydrostatic. Which one to choose and why? Read our article and discover the benefits of these different measurement principles.
On open channel, the three most common technologies are:
Ultrasonic contactless flow measurement: this is the system used in most cases
Radar contactless flow measurement: suitable for high measurement heights
Measuring in contact with a hydrostatic sensor: works in all cases but requires a measuring well. This solution should be preferred in the presence of foam.
Ultrasound vs Radar: which sensor to choose?
When choosing between a radar or ultrasound sensor, there are several considerations to consider:
The accuracy is the same for both probes (2 mm) from the moment the U.S. probe can be installed near the surface to be measured.
Presence of foam
Radar technology seems more reliable than ultrasonic measurement technology (less loss of echoes), as long as the echo can be returned by the surface of the liquid as well as the foam, resulting in a possible oversuperfing of the flow.
Regardless of the supplier, a 26 GHz radar must be installed 50 cm from the maximum level (Hmax). Beware of narrow channels, it will be difficult to distinguish the flanks of Hmax.
Noise signal report
Ultrasons technology generates a better noise signal ratio, a thinner echo curve. This translates into better quality and better signal selectivity.
Whatever your application, Endress-Hauser offers you the most suitable sensor.
Discover our FMU90/FDU90 ultrasound sensors
Discover our FMR20 radar sensors
Discover our FMX21 hydrostatic pressure sensors
Discover our technologies for open channel flow measurement
Think about complying with your self-monitoring devices