Vega VEGAPULS 63 Operating Instructions Manual page 35

Diagnosis - Peak value
Diagnosis - Measurement
reliability
Diagnosis - Curve selec-
tion
Diagnosis - Curve pres-
entation
VEGAPULS 63 • Foundation Fieldbus
6 Set up with the display and adjustment module PLICSCOM
The respective min. and max. measured values are saved in the sen-
sor. The values are displayed in the menu item "Peak values".
•
Min. and max. distance in m(d)
•
Min. and max. temperature
Peak value indicator
When non-contact level sensors are used, the measurement can be
influenced by the respective process conditions. In this menu item,
the measurement certainty of the level echo is displayed as a dB
value. Measurement reliability equals signal strength minus noise. The
higher the value, the more reliable the measurement. A well function-
ing measurement normally has a value > 10 dB.
With ultrasonic sensors, the "Echo curve" represents the signal
strength of the echoes over the measuring range. The unit of signal
strength is "dB". The signal strength enables the jusgement of the
quality of the measurement.
The "False echo curve" displays the saved false echoes (see menu
"Service") of the empty vessel as signal strength in "dB" over the
measuring range.
Up to 3000 measured values are recorded (depending on the sensor)
when starting a "Trend curve". Then the values can be displayed on
a time axis. The oldest measured values are always deleted.
In the menu item "Choose curve", the respective curve is selected.
Curve selection
▼
Echo curve
Information:
The trend recording is not activated when being shipped. It must be
started by the user via the menu item "Start trend curve".
A comparison of the echo curve and the false echo curve allows a
more detailled evaluation of measurement reliability. The selected
curve is updated continuously. With the [OK] key, a submenu with
zoom functions is opened.
The following functions are available with "Echo and false echo
curve":
•
"X-Zoom": Zoom function for the meas. distance
•
"Y-Zoom": 1, 2, 5 and 10x signal magnification in "dB"
•
"Unzoom": Reset the presentation to the nominal measuring range
without magnification
In the menu item "Trend curve" the following are available:
•
"X-Zoom": Resolution
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