Glossary
SITRANS LR250 with FOUNDATION FIELDBUS
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Operating Instructions, 09/2021, A5E32221411-AH
nozzle
a length of pipe mounted onto a vessel that supports the flange.
parameters
in programming, variables that are given constant values for specific purposes or processes.
polarization
the property of a radiated electromagnetic wave describing the time-varying direction and
amplitude of the electric field vector.
propagation factor (pf)
where the maximum velocity is 1.0, pf is a value that represents a reduction in propagation
velocity as a result of the wave travelling through a pipe or medium.
pulse radar
a radar type that directly measures distance using short microwave pulses. Distance is
determined by the return transit time.
radar
radar is an acronym for RAdio Detection And Ranging. A device that radiates electromagnetic
waves and utilizes the reflection of such waves from distant objects to determine their
existence or position.
range
distance between a transmitter and a target.
range extension
the distance below the zero percent or empty point in a vessel.
relative humidity
the ratio of the actual amount of moisture in the atmosphere to the maximum amount of
moisture the atmosphere could hold (which varies depending on the air temperature).
repeatability
the closeness of agreement among repeated measurements of the same variable under the
same conditions.