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6 Set up with the display and adjustment module
Diagnosis - Peak value
Diagnosis - Measurement
reliability
Diagnoses - Curve indica-
tion
Diagnostics - Echo curve
memory
40
5. Save settings with [OK]
The respective min. and max. measured value is saved in the sensor.
The values are displayed in the menu item "Peak values".
When non-contact level sensors are used, the measurement can be
influenced by the respective process conditions. In this menu item,
the measurement reliability of the level echo is displayed as dB value.
The measurement reliability equals signal strength minus noise. The
higher the value, the more reliable the measurement. With a function-
ing measurement, the values are > 10 dB.
The "Echo curve" shows the signal strength of the echoes over the
measuring range in dB. The signal strength enables an evaluation of
the quality of the measurement.
The "False signal suppression" displays the saved false echoes (see
menu "Additional settings") of the empty vessel with signal strength in
"dB" over the measuring range.
A comparison of echo curve and false signal suppression allows a
more detailed statement of the reliability.
The selected curve is continuously updated. A submenu with zoom
functions is opened with the [OK] key:
•
"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
With the function "Echo curve memory" the echo curve can be saved
at the time of setup. This is generally recommended; for using the As-
set Management functions it is absolutely necessary. If possible, the
curve should be saved with a low level in the vessel.
With the adjustment software PACTware and the PC, the high resolu-
tion echo curve can be displayed and used to recognize signal
LEVEL TRANSMITTER 8136 • 4 ... 20 mA/HART - two-wire
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