Dynasonics TFXM Series Ultrasonic Multi-Channel Flow Meter - Manual (Page 26)

Rev. 8/02
- 2.11 - TFXM
(meters per second).
If a pipe material was chosen from the PIPE MAT list, a nominal
value for speed of sound in that material will be automatically
loaded. If the actual sound speed rate is known for the applica-
tion piping system and that value varies from the automatically
loaded value, the value can be revised.
If OTHER was chosen as PIPE MAT, a PIPE SS will need to be
entered.
PIPE R -- Pipe Material Relative Roughness
UNITLESS VALUE
The DTFXM provides Reynolds Number compensation in its
flow measurement calculation. The ratio of average surface
imperfection as it relates to the pipe internal diameter is used in
this compensation.
Linear RMS measurement of the pipe
PIPE R = internal wall surface
Internal Diameter of the pipe
If a pipe material was chosen from the PIPE MAT list, a nominal
value relative roughness in that material will be automatically
loaded. If the actual roughness is known for the application pip-
ing system and that value varies from the automatically loaded
value, the value can be revised.
If OTHER was chosen as PIPE MAT, a PIPE R may need to be
entered.
LINER T -- Pipe Liner Thickness Entry
ENGLSH (Inches)
METRIC (Millimeters)
Enter the pipe liner thickness. Enter this value in inches if
ENGLSH was selected as UNITS; in millimeters if METRIC was
selected.
PART 2 - TRANSDUCER POSITIONING
Liner Thickness
Entry
Pipe
Roughness
Entry