7
TECHNICAL DATA
70
OPTISONIC 6400
www.krohne.com
08/2011 - 4000972602 - MA OPTISONIC 6400 R02 en
7.1 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 7-1: Measuring principle
1
Transducer A
2
Transducer B
3
Flow velocity
4
Transit time from transducer A to B
5
Transit time from transducer B to A
