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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.
Temperature indication too low
• Incorrect alignment of the pyrometer to the object
⇒ New correct alignment to achieve the max. temperature signal
• Measuring object smaller than spot size
⇒ check measuring distance, smallest spot size is at nominal measuring distance
• Measuring object is not always in the measuring spot of the pyrometer
⇒ Use max. value storage (see 4.9
)
• Emissivity set too high
⇒ Set lower correct emissivity corresponding to the material (see 4.5
)
• Lens contaminated
⇒ Clean lens carefully (see 6.2
)
Temperature indication too high
• Emissivity set too low
⇒ Set lower correct emissivity 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
Measuring errors
• Indicated temperature is decreasing during the use of the pyrometer, contamination of the
lens
⇒ Clean lens. Recommendation: use of air purge (see 3.3
)
• Air contamination in the sighting path between pyrometer and object
⇒ Change position of the pyrometer with a clean sighting path (if necessary use a ratio
pyrometer)
• HF-interferences
⇒ Correct the connection of the cable shield (see 3.1
)
• Temperature Indication is fluctuating, probably caused by changing emissivity
⇒ Wrong pyrometer type, use of ratio pyrometer recommended
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