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89
NT UF 811 CO GB (c) / March 2014
III.1 Diagnostic indications
Certain factors may lead to a degradation of the measurement. The following diagnostic indications will help
you to resolve any problems which may occur.

The message "Velocity faults" is permanently displayed
Possible causes:
o
Probes different to those indicated in the settings. Incorrect programming of the Daxe and L
settings.
o
Incorrect connection of the probes. A probe may have been disconnected.
o
Presence of a solid body between the probes.
o
Chords out of the water.
o
Probes incorrectly positioned with regard to each other.
o
Probes excessively clogged.
o
Fluid too absorbent, too much slurry, excessively aerated. Contact us and we will work with
you to find the best solution.
o
Probes defective or Uf 811 malfunctioning. Contact us if your checks result in this
conclusion.
 The message "Flow faults" appears intermittently
The intermittent message "Flow faults" may be due to a weak echo, resulting in a high gain.
The possible causes are, to a lesser extent, identical to those of the "Velocity faults" message (see
above), and in particular:
o
Probes misaligned,
o
Probes clogged,
o
Fluid absorbent, or slurry, or aerated.
Comment: A simple way of masking intermittent measurement faults and increasing the memory
storage time (see section 5.5.1).