PTC Thermistors

PTC Thermistors are sensitive elements in
which ohmic value grows when temperature
increases.

Such variation answers to several laws,
directly dependant of the composition
of sensor.

Two kinds of PTC exist:

Metal PTC, or RTD's, made of pure metal
such as Platinium, Nickel, Copper, or of
metal alloys, or of Silicium (Silicon)
also named Silistors.

These sensors have a practically linear
RT Curve. See the chapter on
Platnium/Nickel/Silistances.

No linear PTC are made of metal oxides,
which are used either for protection
against over temperature, or as self
regulated heating elements.

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