Commissioning Prosonic M - FOUNDATION Fieldbus
52 Endress+Hauser
6.4.6 Envelope curve
After the basic setup, an evaluation of the measurement with the aid of the envelope curve
("envelope curve" (0E) function group) is recommended.
Funxtion "plot settings" (0E1)
In this function, select whether you want to display
• Just the envelope curve
• The envelope curve and the echo evaluation line FAC
• The envelope curve and interference echo suppression (map)
!
Note!
The FAC and the interference echo suppression (map) are explained in BA00240F "Prosonic M -
Description of Instrument Functions"
Function "recording curve" (0E2)
In this function, specify whether you want to display
• An individual envelope curve
• The current envelope curve, with cyclical refreshment.
Function "envelope curve display" (0E3)
The envelope curve is displayed in this function. You can use it to obtain the following information:
L00-FMU4xxxx-07-00-00-en-003
Check that the following conditions are fulfilled:
• The echo quality at the end of measuring range should be at least 10dB.
• There should be practically no interference echoes in front of the level signal.
• If interference echoes cannot be avoided, they must be below the suppression curve.
!
Note!
If the cyclical envelope curve display is still active on the display, the measured value is updated at
a slower cycle time. We therefore advise you to exit the envelope curve display after optimising the
measuring point. To do this, press F. (The instrument does not leave the envelope curve display
automatically.)
minimum distance
of the plot
maximum distance
of the plot
distance of
evaluated echo
interference echo
evaluated echo
is marked
quality of
evaluated echo
empty calibr.
envelope curve
only
envelope curve and
interference echo
suppression (map)
level echo
map
full calibr.
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