Nivetec Echo Smart Series, Руководство по эксплуатации и установке

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Figure 7.2: Echo Profile Display
The signal waveform is presented graphically with the horizontal x-axis representing
the Tank Depth and the vertical y-axis as the strength of signal at positions along the
dimensional axis. The Sensor is identified by symbol in the lower left corner of the
graph, and the Tank Bottom is indicated in the lower right corner.
An interface is generally identified as a rising slope (left side) of the curve of a signal.
This reflects a significant increase in the amplitude of signal at a particular location
(distance from the sensor). Stable and repeated signals are given preference over more
transient ones.
The selected signal is identified on the waveform by a dashed vertical line that is called
a Candidate.
7.3.
Tracking
Tracking is the term EchoSmart uses to specify the process of producing the primary
measurement and following (tracking) its progress over time. The “Track” is the
position of the Current Measurement on the Waveform graphic and is identified by a
downward pointing arrow at the top of the screen.
7.3.1. Gate
EchoSmart employs enhanced algorithms that operate to stabilize measurements
and prevent inadvertent tracking to transient or spurious signals. One of these is
referred to as the Gate mechanism. The Gate is a stable yet dynamic area around
the Current Measurement. Signal that is inside the Gate is given preferential
consideration. Signal outside the Gate must persist in order to be considered valid.
It is seen on the waveform graphic as dotted lines on either side of the Track. See
9.2.11 LG Min and 9.2.12 RG Min for parameters that establish the dimensions of
the Gate.
Gates
Candidate
Track
Tank Bottom
Signal