ISR 12-LO/GS Manual
Troubleshooting
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43
9
Troubleshooting
Before sending the pyrometer for repair, try to find the error and to solve the problem with the
help of the following list.
Symptom
Probable Cause
Comments
Temperature
indication too low
Emissivity slope set too high
Set lower correct emissivity
slope corresponding to the
material
See section
4.5
Temperature
indication too high
Emissivity slope set too low
Set lower correct emissivity
slope corresponding to the
material (see
4.5
)
The measurement is influenced by
reflections of hot machine parts
Use mechanical construction
to avoid the influence of the
interfering radiation (sighting
tube)
No temperature
indication at the
end of the pouring
stream
Pouring stream is not in the spot of
the pyrometer
New correct alignment of the
optical head (see
3.6
)
Optical head contaminated or
scratched
Signal strength too low, clean
or change optical head
Recommendation: use of air
purge
Pouring stream is much smaller than
spot size, thus the signal strength is
too low (see
4.3
)
Choose shorter measuring
distance
No temperature indication during the
use of the pyrometer, although the
air purge unit is used
Probably compressed air is not
clean or air failed. Clean optics
and use clean and oil free air
HF-interferences
Correct the connection of the
cable shield
