Diagnostics and troubleshooting
Prosonic S FMU95 PROFIBUS DP
60
Hauser
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.
