Dynasonics TFX Ultra Transit Time Flow Meters - Manual (Page 41)

Allows adjustments to be made to the speed of sound value, shear or transverse wave, for the pipe wall. If the UNITS value was
set to ENGLSH, the entry is in fps (feet per second). METRIC entries are made in mps (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 is known for the application piping system and that value varies from the automatically
loaded value, the value can be revised.
If OTHER was chosen as PIPE MAT, then a PIPE SS must also be entered.
Pipe Roughness
PIPE R — Pipe Material Relative Roughness (Value)
Unitless Value
The flow meter provides flow profile 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 algorithm and is found by using the
following formula:
Linear RMS Measurement of the Pipes Internal Wall Surface
Inside Diamet
Pipe
er of the Pip
R
e
=
If a pipe material was chosen from the PIPE MAT list, a nominal value for relative roughness in that material will be
automatically loaded. If the actual roughness is known for the application piping system and that value varies from the
automatically loaded value, the value can be revised.
Liner Thickness
LINER T — Pipe Liner Thickness (Value)
ENGLSH (Inches)
METRIC (Millimeters)
If the pipe has a liner, enter the pipe liner thickness. Enter this value in inches if ENGLSH was selected as UNITS; in millimeters if
METRIC was selected.
Liner Material
LINER MA — Pipe Liner Material (Choice)
Liner Type - (If a LINER Thickness was selected)
Tar Epoxy TAR EPXY HD Polyethylene HDPE
Rubber RUBBER LD Polyethylene LDPE
Mortar MORTAR Teflon (PFA) TEFLON
Polypropylene POLYPRO Ebonite EBONITE
Polystyrene POLYSTY Other OTHER
This list is provided as an example. Additional materials are added periodically. Select the appropriate material from the list or
select OTHER if the liner material is not listed.
Liner Sound Speed
LINER SS — Speed of Sound in the Liner (Value)
ENGLSH (Feet per Second)
METRIC (Meters per Second)
Allows adjustments to be made to the speed of sound value, shear or transverse wave, for the pipe wall. If the UNITS value was
set to ENGLSH, the entry is in fps (feet per second). METRIC entries are made in mps (meters per second).
If a liner was chosen from the LINER MA list, a nominal value for speed of sound in that media will be automatically loaded. If
the actual sound speed rate is known for the pipe liner and that value varies from the automatically loaded value, the value
can be revised.
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Page 41 March 2014