Siemens SITRANS L Operating Instructions Manual page 221

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.
echo
a signal that has been reflected with sufficient magnitude and delay to be perceived in some
manner as a signal distinct from that directly transmitted. Echoes are frequently measured in
decibels relative to the directly transmitted signal.
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
Glossary
221