LumaSense Technologies IS 12-Al/S - Manual (Page 31)

IS 12 AI & IS 12-AI/S Troubleshooting 31
8 Troubleshooting
Before sending the pyrometer for repair, try to find the error and to solve the problem with the
help of the following list.
Temperature indication too low
Incorrect alignment of the pyrometer to the object
New correct alignment to achieve the max. temperature signal
Incorrect focusing of the optics
Focus correctly to the measuring distance, if necessary change lens
Measuring object smaller than spot size
Change lens and measuring distance
Measuring object is not always in the measuring spot of the pyrometer (e.g. swinging
wire or pouring stream)
Use max. value storage or pyrometer with scanning system with max. value storage
Emissivity set too high
Set lower correct emissivity corresponding to the material
Lens contaminated or scratched
Clean lens carefully or replace it
Temperature indication too high
Emissivity set too low
Set lower correct emissivity corresponding to the material
The measurement is influenced by reflections of hot machine parts
Use mechanical construction to avoid the influence of the interfering radiation
(sighting tube)
Measuring errors
Indicated temperature is decreasing during the use of the pyrometer, contamination of
the lens
Clean lens. Recommendation: use of air purge
Indicated temperature is decreasing during the use of the pyrometer, although the air
purge unit is used. Probably compressed air is not clean or air failed
Clean the lens and use clean, dry and oil free compressed air
Air contamination in the sighting path between pyrometer and object
Change position of the pyrometer with a clean sighting path or use a ratio pyrometer
HF-interferences
Correct the connection of the cable shield
Instrument overheated
Use cooling jacket with air or water cooling
Temperature Indication is fluctuating, probably caused by changing emissivity
Wrong pyrometer type, use of ratio pyrometer recommended
Laser targeting light
Laser targeting light fails
Instruments temperature above 55 °C. Use cooling jacket.