A5E32337695 SITRANS Probe LU (HART) – OPERATING INSTRUCTIONS Page 107
Glossary
pulse: a wave that departs from an initial level for a limited duration of time, and returns to the
initial level.
range: distance between a transmitter and a target.
range extension: the distance below the zero percent or empty point in a vessel.
repeatability: the closeness of agreement among repeated measurements of the same
variable under the same conditions.
shot: one transmit pulse or measurement.
stillpipe: a pipe that is mounted inside a vessel parallel to the vessel wall, and is open to the
vessel at the bottom.
stilling-well: see stillpipe.
TVT (time varying threshold): a time-varying curve that determines the threshold level above
which echoes are determined to be valid.
ultrasonic: having a frequency above the human ear’s audibility limit: about 20,000 hertz.
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