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6 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
• Measuring object is smaller than spot size
⇒ Check measuring distance, smallest spot size is at nominal measuring distance (see 3.3)
• Emissivity set too high
⇒ Set lower correct emissivity corresponding to the material (see 4.1)
• Lens contaminated
⇒ Clean lens carefully (see 5.2)
Temperature indication too high
• Emissivity set too low
⇒ Set higher correct emissivity corresponding to the material (see 4.1)
• The measurement is influenced by reflections of hotter machine parts
⇒ Try to avoid the influence of the interfering radiation or change measuring position
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
• Strong HF-interferences
⇒ Correct the connection of the cable shield (see 3.1)
• Instrument overheated
⇒ Use cooling jacket with air or water cooling
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