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Series 24-HP Instruction Manual Appendix B Glossary
IM-24-HP B-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, usually 14.7 psia and 20° C).
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 fre-
quency to the fluid velocity.
Totalizer An electronic counter which records the total accu-
mulated 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.