Category Parameter Meaning Option Description
Fluid
Type Fluid/media type
Select a fluid type. selected from a pull-down list. If the liquid is not found in the list, select Other and
enter the liquid Sound Speed and Absolute Viscosity into the appropriate boxes. The liquid’s specific
gravity is required if mass measurements are to be made, and the specific heat capacity is required for
energy measurements.
Sound Speed
Speed of sound in
the fluid
ENGLISH (fps)
METRIC (mps)
Allows adjustments to be made to the speed of sound entry for the liquid. 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 fluid was chosen from the FLUID 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 FLUID TYPE, a FLUID SOUND SPEED 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 UltraLink software utility. See "Target Dbg Data Screen Definitions" on page 40.
Specific
Gravity
Fluid specific
gravity
(Enter a numeric
value)
Allows adjustments to be made to the specific gravity (density relative to water) of
the liquid.
As stated previously in the FLUID ABSOLUTE VISCOSITY section, specific gravity
is used in the Reynolds correction algorithm. It is also used if mass flow
measurement units are selected for rate or total.
If a fluid was chosen from the FLUID TYPE list, a nominal value for specific gravity in
that media will be automatically loaded. If the actual specific gravity 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 FLUID TYPE, a SPECIFIC GRAVITY may need to be entered
if mass flows are to be calculated. See “Specifications” on page 54 for list of
alternate fluids and their specific gravities.
Fluid
Absolute
Viscosity
Absolute viscosity
of the fluid
(Enter a numeric
value in
centipoise)
Allows adjustments to be made to the absolute viscosity of the liquid in centipoise.
Ultrasonic transmitters use pipe size, viscosity and specific gravity to calculate
Reynolds numbers. Since the Reynolds number influences flow profile, the
transmitter has to compensate for the relatively high velocities at the pipe center
during transitional or laminar flow conditions. The entry of FLUID VI is used in the
calculation of Reynolds and the resultant compensation values.
If a fluid was chosen from the FLUID 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 FLUID TYPE, then a FLUID ABSOLUTE VISCOSITY must also
be entered. See "Fluid Properties" on page 49 for a list of alternate fluids and their
associated viscosities.
Specific Heat
Capacity
Fluid specific heat
capacity
BTU/lb
Allows adjustments to be made to the specific heat capacity of the liquid.
If a fluid was chosen from the FLUID TYPE list, a default specific heat will be
automatically loaded. This default value is displayed as SPECIFIC HEAT. If the actual
specific heat of the liquid is known or it differs from the default value, the value
can be revised. See Table 5, Table 6 and Table 7 for specific values. Enter a value that
is the mean of both pipes.
Conguration Menu
Page 34 April 2016TTM-UM-00369-EN-03
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