LIMIT | Everything can be measured 1
ABOUT IR TEMPERATURE MEASUREMENT Principles It is
a well-known fact that all bodies give off electromagnetic waves, or radiation, depending on their temperature. When this radiation is distributed, energy is also transported. This means that radiation can be used to measure temperature without touching the object being measured. When does IR temperature measurement work? It is generally possible to perform good measurements on all non-metallic materials and painted metal surfaces. IR measurement is not recommended for highly polished metal surfaces: the surface has to be painted or taped. What is emissivity factor? Different materials emit, radiate and reflect to different extents, so correction is necessary in order to guarantee the accuracy of the IR measurement. This correction is known as the emissivity factor. Sources of problems during IR measurement • Emissivity factor set incorrectly. Check that the correct factor has been set, if it is possible to adjust this. • Polished metal surface. The reflection affects the measurement more than the emissivity. • Measurement marks are larger than the object being measured. • Dirt or mist on the lens. • Large temperature difference between the instrument and the ambient air. | 129