The most linear, repeatable devices are made of platinum, a precious metal that is suitable for temperature measurements over a wide operating range. RTD elements use two basic sensing technologies.

Disadvantages include their non-linearity, and unsuitability for use in extreme temperatures. Bimetal switches use a bimetal spring as their temperature-sensing element. This coil spring is made of ...

Recently, although the temperature crosstalk can be effectively eliminated by integrating multiple sensing elements, it is at ...