Measurement Technique For Thermographic Inspection Of Electrical Installations; How To Correctly Set The Equipment; Temperature Measurement - FLIR i3 User Manual

17.3 Measurement technique for thermographic inspection
of electrical installations
17.3.1

How to correctly set the equipment

A thermal image may show high temperature variations:
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Figure 17.2 Temperature variations in a fusebox
In the images above, the fuse to the right has a maximum temperature of +61°C
(+142°F), whereas the one to the left is maximum +32°C (+90°F) and the one in the
middle somewhere in between. The three images are different inasmuch as the tem-
perature scale enhances only one fuse in each image. However, it is the same image
and all the information about all three fuses is there. It is only a matter of setting the
temperature scale values.
17.3.2

Temperature measurement

Some cameras today can automatically find the highest temperature in the image.
The image below shows how it looks to the operator.
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Figure 17.3 An infrared image of a fusebox where the maximum temperature is displayed
The maximum temperature in the area is +62.2°C (+144.0°F). The spot meter shows
the exact location of the hot spot. The image can easily be stored in the camera
memory.
The correct temperature measurement depends, however, not only on the function
of the evaluation software or the camera. It may happen that the actual fault is, for
example, a connection, which is hidden from the camera in the position it happens
Publ. No. T559580 Rev. a486 – ENGLISH (EN) – November 17, 2010
17 – Introduction to thermographic inspections of electrical installations
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