Siemens SITRANS LR200 7ML5422 Operating Instructions Manual page 203

beam width
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.
confidence
see Echo Confidence.
damping
term applied to the performance of a device to denote the manner in which the measurement
settles to its steady indication after a change in the value of the level.
dB (decibel)
a unit used to measure the amplitude of signals.
derating
to decrease a rating suitable for normal conditions according to guidelines specified for
different conditions.
dielectric
a nonconductor of direct electric current. Many conductive liquids/electrolytes exhibit
dielectric properties; the relative dielectric constant of water is 80.
dielectric constant (dK)
the ability of a dielectric to store electrical potential energy under the influence of an electric
field. Also known as Relative Permittivity. An increase in the
dielectric constant is directly proportional to an increase in signal amplitude. The value is
usually given relative to a vacuum /dry air: the dielectric constant of air is 1.
SITRANS LR200 with mA/HART
Operating Instructions, 05/2019, A5E32337676-AE
203