Contactless temperature measurement

The use of radiation pyrometer often is the simplest method to measure the temperature of surfaces. The typical disadvantages of contact sensors, like mistakes in discharge, wearout- and time delay, disappear by the contactless temperature measurement. Nevertheless some principles are to observe. The essential selection criterias for a radiation pyromter is the spectral range and the size of the measuring spot.

De facto, the most often used readings recorder are partial radiation pyrometers in long-wave spectral range of 8 ... 14µm or short-wave in strait partial areas of 0.7 ... 3µm. Special ranges for the measuring of glass are by 5.14µm.

Metallic surfaces show a good emission in the short-wave IR-range, while nonmetallic surfaces in long-wave spectral range emit the IR-radiation better and more stable.

Please note, that only the surface material is the crucial factor for the emissivity, for example, lacqured, metallic objects emit long-wave very good. The same applies to oily, dirty or rusty sheets. If in doubt, you can apply our emission factor spray item no. 03304 or you can make a comparison measurement with a digital Thermometer (for example MP2000 - Article No. 3740300) and contact sensors.