Chauvin Arnoux C.A 1875, Руководство пользователя

Страница: 76 / 100

Français
75
It is assumed that a fault is resistive in character. The raw temperature difference
must be corrected for the load:
∆ T
effective
= ∆ Traw x (Inominal/Imeasured)²
It is the effective difference that must be considered when classifying the fault.
It remains to be determined how urgent maintenance is. This determination is very
important, because it provides a veritable location in time; whence easy
management of the processing of the anomalies.
An infrared image and a photograph in visible light record the fault.
Application: see appendix 3, exercise 11
Application: mechanical maintenance
Mechanical parts in movement are normally heated because of friction. Infrared
thermography is used to reveal abnormal temperature rises due to:
•
wear
•
misalignment
•
a lubrication problem.
This means of investigation is used primarily on motor-pump and motor-blower
sets. It is used as a complement to a vibration analysis, which is much more
cumbersome to set up.
A single image shows us the soundness of the electric motor, of its power supply
(cables), of the bearings, and possibly of the alignment.
It remains to be determined how urgent maintenance is.
Application: building heating and cooling
These applications of infrared thermography concern architects, the installers of
heating and sanitary systems, the operators of heating systems, electricians, real
estate companies, real estate experts, owners, and insurers.
Using infrared radiation, it is easy to visualize the distribution of heat on the outside
wall of a building and it is possible to precisely locate heat losses due to insulation
defects. This makes it possible to draw up a thermal assessment of a building.
It is also possible to visualize underground piping:
-
In-floor heating:
English