ONICON F-2600 - Manual (Page 130)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page C-3
Q R S T
Q Flow rate, usually volumetric
Rangeability Highest measurable flow rate divided by the lowest
measurable flow rate
Reynolds Number A dimensionless number equal to the density of a fluid
or Re times the velocity of the fluid times the diameter of
the fluid channel, divided by the fluid viscosity
(i.e., Re = ρVD/μ). The Reynolds number is an important
number for vortex flow meters because it is used to
determine the minimum measurable flow rate. It is the
ratio of the inertial forces to the viscous forces in a flowing
fluid.
RTD Resistance temperature detector, a sensor whose resistance
increases as the temperature rises
scfm Standard cubic feet per minute (flow rate converted to
standard conditions, as shipped 14.696 psia and 59° F).
User definable.
Shedder Bar A non-streamlined body placed into a flow stream to
create vortices. Also called a bluff body.
Strouhal Number A dimensionless number equal to the frequency
or St of vortices created by a bluff body times the width of the
bluff body divided by the velocity of the flowing fluid (i.e.,
St = fd/V). This is an important number for vortex flow
meters because it relates the vortex frequency to the fluid
velocity.
Totalizer An electronic counter which records the total accumulated
flow over a certain range of time
Traverse The act of moving a measuring point across the width of a
flow channel
U V W X Y Z
Uncertainty The closeness of agreement between the result of a
measurement and the true value of the measurement
V Velocity or voltage
VAC Volts, alternating current
VDC Volts, direct current
VORTEX An eddy of fluid