Prosonic S FMU90 PROFIBUS DP Diagnostics and troubleshooting
Endress+Hauser 77
10 Diagnostics and troubleshooting
10.1 General troubleshooting
10.1.1 Calibration error
Measured value incorrect
Check the Actual distance parameter.
• The Actual distance is incorrect:
• For measurements in a bypass or ultrasound guide pipe:
Set the appropriate option in the LVL N appl. param. parameter set.
• Perform interference echo suppression (mapping) (LVL N check value parameter set).
• The Actual distance is correct:
• Check the Empty E and Full F parameters and correct them if necessary.
• Check linearization and correct it if necessary.
No change of measured value on filling/emptying
• Perform interference echo suppression (mapping).
• Clean sensor.
• Select a better installation position for the sensor (to avoid interference echoes).
If the surface is turbulent, the measured value jumps sporadically to higher levels
• Perform interference echo suppression (mapping).
• Set the Process cond. parameter to Turb. surface or Add. agitator.
• Select another installation position and/or a larger sensor.
During filling/emptying, the measured value drops sporadically.
• Set the Tank shape parameter to Dome ceiling or Horizontal cyl.
• Avoid a central mounting position for the sensor.
• If possible, use a stilling well/ultrasound guide pipe.
Echo loss (error E xx 641)
• Check all the application parameters (LVL N appl. param. parameter set)
• Select another installation position and/or a larger sensor.
• Align the sensor so that it is parallel to the surface of the product (particularly for bulk
solids applications).
10.1.2 Checking the signal in the envelope curve display
Aim of the envelope curve display
The measuring signal can be checked with the envelope curve display. From the envelope
curve, it is possible to see if interference echoes are present and if these echoes are
completely suppressed by the interference echo suppression (mapping) function.
Envelope curve on the display module
To call the envelope curve display:
1. Navigate to System informat. → Envelope curve.
2. For devices with several sensors:
Select the sensor whose envelope curve is to be displayed.
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