Commissioning Prosonic S FMU90 PROFIBUS DP
62 Endress+Hauser
Parameter set "Backwater check value"
• This parameter set starts mapping (inference echo suppression) for the downstream
sensor.
• To record all the interference echoes, perform mapping at the minimum level
possible (ideally in an empty channel).
• If it is not possible to empty the channel during commissioning, record preliminary
mapping when the channel is partially filled. Repeat mapping when the level
reaches approximately 0% for the first time.
A0035533
50 Operating principle of the mapping (interference echo suppression) function
A The echo curve (a) contains an interference echo and the level echo. Without mapping, the interference echo
would also be evaluated.
B Mapping generates the mapping curve (b). This suppresses all the echoes that are inside the range of
mapping (c).
C Afterwards, only echoes that are higher than the mapping curve are evaluated. The interference echo is below
the mapping curve and is therefore ignored (not evaluated).
Navigation
Flow → Flow 1 +backwater → Backwater → Basic setup → Backw. check value
Parameter
• Distance
Displays the distance D currently measured between the sensor membrane and the
surface of the liquid.
• Check distance
Compare the distance displayed with the actual value and enter the result of the
comparison. Based on the entry, the device automatically determines the range of
mapping.
• Distance = ok
The displayed distance and actual distance match.
→ Continue to the Backwater mapping parameter set.
• Dist. too small
The displayed distance is smaller than the actual distance.
→ Continue to the Backwater mapping parameter set.
• Dist. too big
The displayed distance is larger than the actual distance.
→ Mapping is not possible.
→ Downstream sensor setup ends.
• Dist. unknown
Actual distance is unknown.
→ Mapping is not possible.
→ Downstream sensor setup ends.
• Manual
The range of mapping is to be defined manually.
→ Continue to the Backwater mapping parameter set.
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