Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 85)

Rev. 8/02 -5. 3- TFXM
values are not being shown on the graphics display.
Multiple Path Flow Meter
By applying more than one set of transducers radially around a
pipe, accuracy can be improved in conditions where optimum
straight pipe diameters are not available. Typical installations
only involve two paths, but on large pipes several paths could be
employed. See Figure 5.2 . Only one multiple path system is
permitted per flow measurement network.
To configure the flow meter for multiple path operation, apply the
transducers radially around the pipe and apply equal coefficients
to each channel that total up to 1.00. For two path systems, 0.50
+0.50 = 1.00; for three path systems 0.333+0.333+0.334 = 1.000;
etc.
MULTICHANNEL OPERATION
Multiple Path
Configuration
Figure 5.1
Configuration for Multiple Pipe Readings