Dynasonics TFX Ultra Transit Time Flow Meters - Manual (Page 42)

Liner Roughness
LINER R — Liner 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 and is found by using the following
formula:
Linear RMS Measurement of the Liners Internal Wall Surface
Inside Diameter of the Liner
Liner R =
If a liner material was chosen from the LINER MA 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.
Fluid Type
FL TYPE — Fluid/Media Type (Choice)
Water Tap WATER Ethanol ETHANOL Oil Diesel DIESEL
Sewage-Raw SEWAGE Ethylene Glycol ETH-GLYC Oil Hydraulic [Petro-based] HYD OIL
Acetone ACETONE Gasoline GASOLINE Oil Lubricating LUBE OIL
Alcohol ALCOHOL Glycerin GLYCERIN Oil Motor [SAE 20/30] MTR OIL
Ammonia AMMONIA Isopropyl Alcohol ISO-ALC Water Distilled WATR-DST
Benzene BENZENE Kerosene KEROSENE Water Sea WATR-SEA
Brine BRINE Methanol METHANOL Other OTHER
This list is provided as an example. Additional liquids are added periodically. Select the appropriate liquid from the list or
select OTHER if the liquid is not listed.
Fluid Sound Speed
FLUID SS — Speed of Sound in the Fluid (Value)
ENGLSH (Feet per Second)
METRIC (Meters per Second)
Allows adjustments to be made to the speed of sound entry for the liquid. 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 fluid was chosen from the FL TYPE list, a nominal value for speed of sound in that media will be automatically loaded. If the
actual sound speed is known for the application fluid and that value varies from the automatically loaded value, the value can
be revised.
If OTHER was chosen as FL TYPE, a FLUID SS will need to be entered. A list of alternate fluids and their associated sound speeds
is located in the Appendix located at the back of this manual.
Fluid sound speed may also be found using the Target DBg Data screen available in the software utility. See
SOFTWARE
UTILITY .
Fluid Viscosity
FLUID VI — Absolute Viscosity of the Fluid (Value - cP)
Allows adjustments to be made to the absolute viscosity of the liquid in centipoise.
Ultrasonic flow meters utilize pipe size, viscosity and specific gravity to calculate Reynolds numbers. Since the Reynolds
number influences flow profile, the flow meter has to compensate for the relatively high velocities at the pipe center during
transitional or laminar flow conditions. The entry of FLUID VI is utilized in the calculation of Reynolds and the resultant
compensation values.
If a fluid was chosen from the FL TYPE list, a nominal value for viscosity in that media will be automatically loaded. If the actual
viscosity is known for the application fluid and that value varies from the automatically loaded value, the value can be revised.
If OTHER was chosen as FL TYPE, then a FLUID VI must also be entered. A list of alternate fluids and their associated viscosities is
located in the APPENDIX of this manual.
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Page 42 March 2014