LumaSense Technologies IN 5/5 - Handbuch (Seite 25)

INFRATHERM pyrometers IN 5 · IN 5/5
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12 Trouble shooting
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 (see 8)
• Measuring object smaller than spot size
⇒ check measuring distance, smallest spot size is at nominal measuring distance (see 7)
• Emissivity set too high
⇒ Set lower correct emissivity corresponding to the material (see 9.1.1)
• Lens contaminated
⇒ Clean lens carefully (see 11.2)
Temperature indication too high
• Emissivity set too low
⇒ Set lower correct emissivity corresponding to the material (see 9.1.1)
• 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 11.2, 6.1)
• 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 (if necessary use a ratio pyrometer)
• HF-interferences
⇒ Correct the connection of the cable shield (see 5)
• Instrument overheated
⇒ Use cooling jacket with air or water cooling (see 6.1)
• Temperature Indication is fluctuating, probably caused by changing emissivity
⇒ Wrong pyrometer type, use of ratio pyrometer recommended