Instruction Manual

8 TECHNICAL DATA
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UFM 530 HT
www.krohne.com 12/2013 - 4002393201- HB UFM 530 HT R02 en
8.1 Measuring principle
• Like canoes crossing a river, acoustic signals are transmitted and received along a diagonal
measuring path.
• A sound wave going downstream with the flow travels faster than a sound wave going
upstream against the flow.
• The difference in transit time is directly proportional to the mean flow velocity of the medium.
Figure 8-1: Measuring principle
1 Flow velocity
2 Transducer A
3 Acoustic path
4 Transducer B
5 Angle (between flow vector and acoustic path vector)
6 Diameter