Siemens SITRANS LUT400 Series User Manual

A5E33329501 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS Page 283
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Glossary
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.
Auto False-Echo Suppression: a technique used to adjust the level of a TVT curve to avoid the
reading of false echoes. (See TVT.)
Auto False-Echo Suppression Range: defines the endpoint of the TVT distance. (See TVT.) This
is used in conjunction with auto false echo suppression.
blanking: a blind zone extending away from the reference point plus any additional shield
length.The device is programmed to ignore this zone.
confidence: describes the quality of an echo. HIgher values represent higher quality.
Confidence threshold defines the minimum value.
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.
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.
echo confidence: the recognition of the validity of the echo. A measure of echo reliability.
echo lock window: a window centered on an echo in order to locate and display the echo’s
position and true reading. Echoes outside the window are not immediately processed.
Echo marker: a marker that points to the processed echo.
Echo Processing: the process by which the device determines echoes.
Echo Strength: describes the strength of the selected echo in dB referred to 1 μV rms.
Echo Profile: a graphical display of a processed echo.
false echo: any echo which is not the echo from the desired target. Generally, false echoes are
created by vessel obstructions.
far range: the distance below the zero percent or empty point in a vessel.
figure of merit: combines noise level, tracking quality, and signal strength to measure the
quality of the reported echo value.

Siemens SITRANS LUT400 Series Specifications

General

Brand	Siemens
Model	SITRANS LUT400 Series
Category	Controller
Language	English