ULTRASONIC FLOW METERS
- High measuring accuracy independent of viscosity, temperature and conductivity
- No pressure loss through the smooth metering tube and no obstructions to flow
- Exact calibration by direct volume comparison
- Intrinsically safe version to European Standard Zone 0
- Low operating cost thanks to low power consumption and zero maintenance
KROHNE PRODUCT VIDEOS
Altosonic III - Ultrasonic Flow Meter
Windows Media |
Flash Video
UFM 3030 - Ultrasonic Flow Meter
Windows Media |
Flash Video
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Ultrasonic flowmeters (UFM's) find universal use for non-contact measurement of all fluids and gasses in which ultrasonic waves can propagate. The principle
of measurement is based on ultrasonic transit time. All our ultrasonic flowmeters are calibrated on the world's largest and most accurate calibration rig
and all operate using the Transit-time Differential Method.
The Transit-time Differential Measurement is based on a simple physical fact: Imagine two canoes crossing a river on the same diagonal line, one with the
flow and the other against the flow. The canoe moving with the flow needs much less time to reach the opposite bank. Ultrasonic waves behave exactly the
same way. A sound wave travelling in the direction of flow of the product is propagated at a faster rate than one travelling against the flow (vAB > vBA).
Transit times tAB and tBA are measured continuously. The difference (tBA - tAB) in time travelled by the two ultrasonic waves is directly proportional
to the mean flow velocity (vm) of the product. The volumetric flowrate per unit time is the product of the mean flow velocity (vm).
A liquid product is identified by direct measurement of the transit time of ultrasonic waves. Assuming the same path length (L), the transit time in water
is shorter than in crude oil, for example.
