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The problem with measuring surface temperature using a resistance thermometer lies in the fact that the resistor must be positioned as fully as possible on the surface. Resistors built into protective tubes are difficult to attach and also have little contact with the surface. Their relatively large mass means that they have a significant influence on the surface temperature. For better positioning there are thermometers in which the platinum wire is attached to a Kapton foil, which is then bonded directly onto the surface. The advantage of this is that the surface thermometer can also be affixed to round surfaces. Despite this, it is not used very often since these measuring resistors are very complex to manufacture. In most cases, it is easier and cheaper to stick a chip resistor onto the surface. The chip resistor has a low mass of its own and therefore has little influence on the surface. A chip resistor cannot adapt to rounded surfaces, however it is so small that it sits well even on surfaces with small radii.
If the resistor nevertheless needs to be positioned in protective housing, we also offer thermometers in which the resistor is integrated into a cable lug, for example.