Glossary
SITRANS LR250 with mA/HART
Operating Instructions, 10/2019, A5E32220602-AG
275
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).
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.
speed of light
the speed of electromagnetic waves (including microwave and light) in free space. Light
speed is a constant 299, 792, 458 meters per second.
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