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Noise
Any signals received by the flowmeter other than the
transmitted signal.
Positive zero
The feature on Polysonics meters which inhibits
backflow indication or volume accumulation under zero
flow conditions. Setting the low flow or low signal
cutoffs to appropriate values can accomplish this.
Repeatability
The ability of a flowmeter to reproduce a measurement
each time a given flow rate is repeated.
Reynolds number
A dimensionless number which represents the flow of a
liquid as being laminar, transitional, or turbulent. The
Reynolds number is determined by velocity, kinematic
viscosity, and the area through which the fluid is moving.
The Reynolds number (in combination with the pipe
roughness and proximity to elbows or other obstructions)
determines the flow profile. The flowmeter automatically
corrects for these Reynolds number-induced variations in
the profile. Refer to Flow profile.
Scale factor
Provides a means for the user to adjust the instrument
output (Section 5.2). The flow measured by the
instrument is multiplied by this number.
Signal-to-noise-ratio
The proportion of desired ultrasonic signal versus other
unwanted signals (noise).
Slurry
A mixtures of a liquid with any insoluble material such as
clay, cement, coal, etc., usually described in terms of
percent solids content.
Sonic discontinuity
A region which reflects or scatters sound, typically solid
particles or gas bubbles.
Sound speed (sound
velocity)
The speed of propagation of a compressional or shear
wave through a specified material.
Sub-menu
A group of related menus. The sub-menus are listed on
the Main Menu. Refer to Section 3.3.
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