7ML19985JB02 SITRANS Probe LU (PROFIBUS PA) – INSTRUCTION MANUAL Page 117
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Glossary
Near Blanking: see Blanking
nozzle: a length of pipe mounted onto a vessel that supports the flange.
parameterize: to set the values of the parameters that define the functionality of the device
parameters: in programming, variables that are given constant values for specific purposes or
processes.
pulse: a wave that departs from an initial level for a limited duration of time, and returns to the
initial level.
“rack”: when configuring SITRANS Probe LU with Step 7, the Probe LU has a virtual “rack” to
hold data
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.
wear: difference between a current measurement and the benchmark value separating the
startpoint and endpoint of, for example, device lifetime. If the current value is less than
the benchmark, it indicates a ’wear’. This does not have to be measured in time: it could
be, for example, the percentage loss of a protective coating.
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