Siemens SITRANS L Operating Instructions Manual page 261

Glossary
accuracy
degree of conformity of a measure to a standard or a true value.
algorithm
a prescribed set of well-defined rules or processes for the solution of a problem in a finite
number of steps.
ambient temperature
the temperature of the surrounding air that comes in contact with the enclosure of the
device.
antenna
an aerial which sends out and receives a signal in a specific direction. There are four basic
types of antenna in radar level measurement, horn, parabolic, rod, and waveguide.
Auto False-Echo Suppression
a technique used to adjust the level of a TVT to avoid the reading of false echoes. (See TVT.)
Auto-False Echo Suppression Range
defines the endpoint of the learned TVT distance. (See TVT.) This is used in conjunction with
auto false echo suppression.
beam angle
the angle diametrically subtended by the one-half power limits (-3 dB) of the microwave
beam.
blanking
a blind zone extending away from the reference point plus any additional shield length.The
device is programmed to ignore this zone.
capacitance
the property of a system of conductors and dielectrics that permits the storage of electricity
when potential differences exist between the conductors. Its value is expressed as the ratio of
a quantity of electricity to a potential difference, and the unit is a Farad.
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
261