Endress+Hauser Micropilot FMR51, Operating Instructions Manual

Page: 96 / 198

Diagnostics and troubleshooting Micropilot FMR51, FMR52 FOUNDATION Fieldbus
96 Hauser
Error Possible cause Remdy
If the surface is not calm (e.g.
filling, emptying, agitator
running), the measured value
jumps sporadically to a
higher level Signal is weakened by the rough
surface - the interference echoes are
sometimes stronger. • Carry out tank mapping ( Confirm
distance parameter (→  130)).
• Select Tank type (→  126) =
Process vessel with agitator .
• Increase integration time (Expert
→ Sensor → Distance → Integration
time)
• Optimize orientation of the antenna
• If necessary, select a better mounting
position and/or larger antenna.
During filling/emptying the
measxured value jumps
downwards Multiple echoes • Check Tank type parameter
(→  126).
• If possible, do not select central
installation position.
• If appropriate, use a stilling well.
Error message F941 or S941
"Echo lost" Level echo is too weak. • Check Medium group parameter
(→  127).
• If necessary, select a more detailed
setting in Medium property
parameter (→  138).
• Optimize alignment of antenna
• If necessary, select a better
installation position and/or larger
antenna.
Level echo suppressed. Delete mapping and record it again.
Device displays a level when
the tank is empty. Interference echo Carry out mapping over entire
measuring range when the tank is
empty (
Confirm distance parameter
(→  130)).
Wrong slope of the level in
the entire measuring range Wrong tank type selected. Set Tank type parameter (→  126)
correctly.