dynasonics TFXL series - Page 33

Category Parameter Meaning Option Description
Pipe
Material Pipe material
Select a material from the pull-down list. If the pipe material used is not found in the list, select Other
and enter the actual pipe material Sound Speed and Roughness (much of this information is available
at web sites such as www.ondacorp.com/tecref_acoustictable.html) for pipe relative roughness
calculations.
Sound Speed Pipe sound speed
ENGLISH (fps)
METRIC (mps)
Specifies the speed of sound value, shear or transverse wave, for the pipe wall. If
the UNITS value was set to ENGLISH, 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 MATERIAL 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 MATERIAL, then a PIPE SOUND SPEED must also be
entered.
Pipe O.D.
Pipe outside
diameter
ENGLISH (Inches)
METRIC
(Millimeters)
Enter the pipe outside diameter in inches if ENGLISH was selected as UNITS; in
millimeters if METRIC was selected.
See “North American Pipe Schedules” on page 44 for charts listing popular pipe
sizes. Correct entries for pipe O.D. and pipe wall thickness are critical to obtaining
accurate flow measurement readings..
Roughness
Pipe material
relative roughness
(Enter a numeric
value)
The transmitter 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
PipeR =
Inside Diameter of the Pipe
If a pipe material was chosen from the PIPE MATERIAL 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.
Wall Thickness
Pipe wall
thickness
ENGLISH (Inches)
METRIC
(Millimeters)
Enter the pipe wall thickness in inches if ENGLISH was selected as UNITS; in
millimeters if METRIC was selected.
See “North American Pipe Schedules” on page 44 for charts listing popular pipe
sizes. Correct entries for pipe O.D. and pipe wall thickness are critical to obtaining
accurate flow measurement readings.
Liner
Material Pipe liner material
Select a liner material. If the pipe liner material used is not included in the list, select Other and enter
liner material Sound Speed and Roughness (much of this information is available at web sites such as
www.ondacorp.com/tecref_acoustictable.html).
Sound Speed
Speed of sound in
the liner
ENGLISH (fps)
METRIC (mps)
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 ENGLISH, 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 MATERIAL 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.
Thickness
Pipe liner
thickness
ENGLISH (Inches)
METRIC
(Millimeters)
If the pipe has a liner, enter the pipe liner thickness. Enter this value in inches if
ENGLISH was selected as UNITS; in millimeters if METRIC was selected.
Roughness
Liner material
relative roughness
(Enter a numeric
value)
The transmitter provides ow prole compensation in its ow measurement
calculation. The ratio of average surface imperfection as it relates to the pipe
internal diameter is used in this compensation and is found by using the following
formula:
     
   Inside Diameter of the Liner
Liner R =
Linear RMS Measurement of the Liner’s Internal Wall Surface
If a liner material was chosen from the LINER MATERIAL list, a nominal value for
relative roughness in that material will be automatically loaded. If the actual
roughness is known for the application liner and that value varies from the
automatically loaded value, the value can be revised. See “Liner material relative
roughness” on page 38 for pipe liner relative roughness calculations.
Conguration Menu
Page 33 April 2016 TTM-UM-00369-EN-03