电阻温度计基于金属在温度变化时也会改变其电阻的物理效应。这些变化在纯金属中尤为强烈。因此，温度传感器，即所谓的测量电阻器，通常由铂 (Pt 100) 制成，它具有抗腐蚀和抗老化的额外优势。使用电阻温度计测量温度的经典方法是侵入性的，即将 Pt 100 探头通过容器或管子上的孔直接插入介质中。夹式解决方案提供了一种非侵入性的管道卫生测量替代方案。在这种情况下，温度计被夹在管子的外面并测量管子外表面的温度。
Resistance thermometers are based on the physical effect that metals also change their electrical resistance when their temperature changes. These changes are particularly strong in pure metals. Temperature sensors, so-called measuring resistors, are therefore often made from platinum (Pt 100), which has the additional benefit of being resistant to corrosion and ageing. The classic method of temperature measurement with resistance thermometers is invasive, i.e. the Pt 100 probe is inserted directly into the medium through a hole in the container or tube. A non-invasive alternative for hygienic measurement on tubes is provided by the clamp-on solution. In this case, the thermometer is clamped onto the outside of the tube and measures the temperature of the outer tube surface.