Onicon F-2600 Instrukcja Użytkownika Pobierz pdf (Strona 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 ow rate divided by the lowest

measurable ow rate

Reynolds Number A dimensionless number equal to the density of a uid

or Re times the velocity of the uid times the diameter of

the uid channel, divided by the uid viscosity

(i.e., Re = ρVD/). The Reynolds number is an important

number for vortex ow meters because it is used to

determine the minimum measurable ow rate. It is the

ratio of the inertial forces to the viscous forces in a owing

uid.

RTD Resistance temperature detector, a sensor whose resistance

increases as the temperature rises

scfm Standard cubic feet per minute (ow rate converted to

standard conditions, as shipped 14.696 psia and 59° F).

User denable.

Shedder Bar A non-streamlined body placed into a ow 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 owing uid (i.e.,

St = fd/V). This is an important number for vortex ow

meters because it relates the vortex frequency to the uid

velocity.

Totalizer An electronic counter which records the total accumulated

ow over a certain range of time

Traverse The act of moving a measuring point across the width of a

ow 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 uid

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Onicon F-2600 Instrukcja Użytkownika Strona 130