IS 140 • IGA 140 Manual
Troubleshooting
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31
8 Troubleshooting
Before sending the pyrometer for repair, it is recommended that you try to find the error and to
solve the problem with the help of the following list.
Temperature indication too low
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Incorrect alignment of the pyrometer with the object
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realign to achieve the maximum temperature signal
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Measuring object smaller than spot size
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check the measuring distance, the smallest spot size is at nominal measuring distance
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Measuring object is not always in the measuring spot of the pyrometer
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Use maximum value storage
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Emissivity set too high
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Enter a higher emissivity value suitable for the material
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Lens contaminated
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Clean lens carefully
Temperature indication too high
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Emissivity set too low
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Enter a lower emissivity value suitable for the material
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The measurement is influenced by reflections of hot machine parts
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Use mechanical construction to avoid the influence of the interfering radiation
Measuring errors
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Indicated temperature is decreasing during the use of the pyrometer due to contamination
of the lens
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Clean the lens. Recommendation: use of an air purge
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Air contamination in the sighting path between pyrometer and object
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Change position of the pyrometer to a clean sighting path (if necessary use a ratio
pyrometer)
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HF-interference
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Correct the connection of the cable shield
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Temperature indication is fluctuating, probably due to changing emissivity
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Wrong pyrometer type, use of ratio pyrometer recommended
Laser targeting light
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Laser targeting light fails
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Instrument’s maximum temperature is exceeded. Use cooling jacket (see 2.6).
Note:
The wavelength band of the IS 140 and IGA 140 reacts at low measuring
temperatures (below 600 and 300 °C) to incandescent lamps or very bright daylight
(not valid for fluorescent tube). For a correct measurement, strong external light to the
measured object should be avoided.
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