Metal resistance thermometers exploit the change in resistivity of certain materials as the temperature changes. In particular, for metals there is a linear relationship between resistance and resistivity (via the cross-section and length of the conductor). Our Pt100 and Pt1000 resistance thermometers are made of platinum, where the resistance at a temperature of 0 C is 100 Ω and 1000 Ω respectively. The temperature limits and tolerance classes of resistance thermometers are standardised by IEC 60751. The sensors, wire-wound or thin-film, are insulated and encased in a protective sheath in order to withstand the industrial environments in which it is installed better and longer. - Traditional insulation, generally consisting of ceramic insulators. - Mineral oxide insulation innovative magnesium oxide insulation.