Endress+Hauser Prosonic S FMU90 - 10.3 Envelope curve display

Troubleshooting
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10.3 Envelope curve display
The measuring signal can be checked by the envelope curve display. From the envelope curve it is
possible to see if there are interference echos and if they are completely suppressed by the interfe-
rence echo suppression.
The envelope curve can be displayed on the display and operating module of the Prosonic S or in
the ToF Tool - Fieldtool Package.
10.3.1 Envelope curve on the display module
1. Go to the "system information" submenu.
2. Select the "envelope curve" submenu.
3. (only relevant for instruments with two sensor inputs): Select the sensor whose envelope curve
you want to check.
4. Select the curves to be displayed:
– Envelope curve: Only the envelope curve is displayed.
– Env. curve + FAC: The envelope curve and the Floating Average Curve (FAC) are dis-
played.
– Env. curve + cust. map: The envelope curve and the customer mapping curve (for inter-
ference echo suppression) are displayed.
5. Select the plot setting:
– single curve
– cyclic
6. Now, the envelope curve display appears:
L00-FMU90xxx-19-00-00-en-083
(a): lower limit of the display range; (b): distance of the evaluated echo (measured from the sensor membrane); (c): upper
limit of the display range; (d): marking of the full calibration F; (e): marking of the empty calibration E; (f): customer map-
ping curve (dotted line
6)
); (g): envelope curve (solid line); (h): echo quality of the evaluated echo
7)
; (i): Marking of the eva-
luated echo.
7. Scaling of the envelope curve display
To display a part of the envelope curve in more detail, the curve can be scaled horizontically.
To do so, press the right key. The or symbol appears in the upper right corner of the
display. You have got the following options:
–Press the middle key to zoom in the envelope curve.
–Press the left key to zoom out the envelope curve.
(a) (b) (c)
(d)
(e)
(f)
(h)
(g)
(i)
6) The Floating Average Curve (FAC) is represented by a dotted line as well.
7) The echo quality is the distance (in dB) between the peak of the echo and the Floating Average Curve (FAC).