6. Maintenance
6.1. Regular maintenance
raises alarm flag in case of a malfunction or certain signals reach alarm limits.
6.2. Alarms
Alarm name Possible cause Action
Sensor eyelet holes blocked. Check that the sensor head is free of debris.
Fiber optic cable in the
sensor getting dirty.
Check that the purge air is on and flow s out from the
sensor eyelet holes (pressure 0.5- 3 Bar).
A LED of the RGB light
source has failed or looses
the intensity.
Clean the ends of the fiber optic cables using e.g.
cotton stick w etted w ith alcohol containing cleaning
agent.
Check the signal levels of all light components. If the
one w hich is used for break detection show s low
intensity select another signal (Configuration -> auto
limit calculation ->signal selection).
Sensor head too close to the
w eb surface.
Move the sensor further aw ay from the w eb or
redirect the sensor eyelet holes slightly slantw ise at
the surface.
A shiny surface close to the
sensor head.
Redirect the sensor to avoid the disturbing reflection.
A strong light beam from a
near by lamp aimed at the
sensor head.
Move the disturbing light or redirect the sensor aw ay
from the light.
Reflection from the w eb
surface still too high.
Reduce the Rx (light receiver) gain in the
"Measurement config" menu (Available gains 0.5, 1.0,
1.5, 2.0, 2.5, 3.0, 3.5, 4.0).
Communication betw een the
display and connection board
has jammed.
Turn off the pow er and restart the unit.
The flat cable connector in
the connection board is
loose.
Check that the flat cable connector is tight.
Measuring Board failure Replace the measuring board.
Check the sensor head.
Ambient light too
high (on-line
signals, ambient
light 60%)
Check cleaning
Optic data timeout
Signal out of range,
clean meas. probe
Piece of paper on the sensor
head.
The R, G or B signal (or IR if in use) is used to monitor the light intensity drift. Gradual drift can be
caused e.g. by dust, which is slowly building up on the fiber optics or by dirty water, which gets inside
the sensor head and stains the surface of the fiber optics.
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