Siemens SITRANS L Operating Instructions Manual page 224

Glossary
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).
relative permittivity
see dielectric constant.
repeatability
the closeness of agreement among repeated measurements of the same variable under the
same conditions.
sensor value
the value produced by the echo processing which represents the distance from sensor
reference point to the target. (see Sensor Mode (2.2.2.) for an illustration).
shot
one transmit pulse or measurement.
stilling-well
see stillpipe.
stillpipe
a pipe that is mounted inside a vessel parallel to the vessel wall, and is open to the vessel at
the bottom.
TVT (Time Varying Threshold)
a time-varying curve that determines the threshold level above which echoes are determined
to be valid.
waveguide antenna
a hollow, metallic tube that transmits a microwave signal to the product target.
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SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF