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What to do if...
Drifting measured
values
OFL
Display of
Measured values
fluctuating heavily
Measured values
too low or too high
44
Cause
– Cleaning efficiency too low - mea-
surement windows becoming
more and more contaminated
– Failure of the optional com-
pressed air cleaning system
– Substantial change of test sample
(sample matrix)
Cause
– Measuring range exceeded
– Foreign matter in the measuring
gap
– Erroneous user calibration
Cause
– Gas bubbles in front of the mea-
surement windows
Cause
– Gas bubbles in front of the mea-
surement windows
Remedy
– Clean the measurement windows
(section 5.2.4)
– Use other cleaning method
– Select different measurement loca-
tion
– Set longer cleaning duration
– Set more frequent cleaning proce-
dures
– Install optional compressed air
cleaning device
– Clean the measurement windows
(section 5.2.4)
– Check all components of the com-
pressed air cleaning system (com-
pressor, compressed air line,
sensor, rinsing openings)
– Carry out new user calibration
Remedy
– Check process
– Clean the measuring gap (section
5.2.3)
– Repeat user calibration. Make sure
the samples for comparison are rep-
resentative.
Remedy
– Check the position within the pro-
cess and the installation position
Remedy
– Check the installation position of the
sensor
ba75953e03
NiCaVis 705 IQ
05/2017
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