Dynasonics DXN Portable Ultrasonic Measurement System - Manual (Page 20)

TOP VIEW
OF PIPE
W-Mount V-Mount Z-Mount
TOP VIEW
OF PIPE
TOP VIEW
OF PIPE
Figure 23: Transit Time Ultrasound Transmission
The following information will be needed to set up the DXN for transit time operation.
1. Transducer mounting method 7. Pipe liner thickness
2. Pipe O.D. (Outside Diameter) 8. Pipe liner material
3. Pipe wall thickness 9. Fluid type
4. Pipe material 10. Fluid sound speed*
5. Pipe sound speed* 11. Fluid viscosity*
6. Pipe relative roughness* 12. Fluid specific gravity*
NOTE: N Much of the data relating to material sound speed, viscosity and specific gravity is pre-programmed into the DXN
flowmeter. This data only needs to be modified if it is known that a particular application’s data varies from the
reference values. See Display Operation and Configuration for instructions on entering configuration data into the
DXN flowmeter .
*Nominal values for these parameters are included within the DXN operating system. The nominal values may be used as they
appear or may be modified if exact system values are known.
DTTN, DTTH and DTTL Transducers
The appropriate mounting configuration is based on pipe and liquid characteristics. Selection of the proper transducer
mounting method is not entirely predictable and many times is an iterative process. Table 1 and Table 2 contain
recommended mounting configurations for common applications. These recommended configurations may need to be
modified for specific applications if such things as aeration, suspended solids, out of round piping or poor piping conditions
are present. Use of the DXN diagnostics in determining the optimum transducer mounting is covered later in this section.
DXN Portable Ultrasonic Measurement System
Page 20 February 2013