KROHNE OPTISONIC 7300 EN - Manual (Page 90)

8
TECHNICAL DATA
90
OPTISONIC 7300
www.krohne.com 09/2012 - 4001102303 - MA OPTISONIC 7300 R03 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 Sound wave against flow direction
2 Sound wave with flow direction
3 Flow direction