IMPAC pyrometers series IN 5 plus
25
12 Maintenance
12.1 Safety
Attention duri
ng pyrometer services:
Should the pyrometer be integrated in a running machine process the machine has to be switched off and
secured against restart before servicing the pyrometer.
12.2 Service
The pyromet
er does not have any parts which require regular service, only the lens has to be kept clean.
The lens can be cleaned with a soft cloth in combination with alcohol (do not use acid solutions or dilution).
Also standard cloths for cleaning glasses or photo objectives can be used.
13 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 6)
•
Measuring object smaller than spot size
⇒ check measuring distance, smallest spot size is at nominal measuring distance (see 7)
•
Measuring object is not always in the measuring spot of the pyrometer
⇒ Use max. value storage (see 9.2.1).
•
Emissivity set too high
⇒ Set lower correct emissivity corresponding to the material (see 9.1.1)
• Len
s contaminated
⇒ Clean lens carefully (see 12.2)
Tempera
ture 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 12.2, 5.1)
•
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 4)
• Instrum
ent overheated
⇒ Use cooling jacket with air or water cooling (see 5.1)
•
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 50°C. Use cooling jacket (see 5.1)
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