RTD Element
What chemical element are Resistance Temperature Detectors (RTD) typically made out of?
Expand Hint
A RTD is a device used to relate change in resistance to change in temperature.
Hint 2
The resistance temperature coefficient, which is determined by the material a RTD is made out of, is typically
$$0.00385^{\circ}C^{-1}$$
.
A RTD is a device used to relate change in resistance to change in temperature. The controlling equation for a RTD is:
$$$R_T=R_0[1+\alpha (T-T_0)]$$$
where
$$R_T$$
is the RTD’s resistance at temperature
$$T$$
,
$$R_0$$
is the RTD’s resistance at the reference temperature
$$T_0$$
(usually 0°C), and
$$\alpha$$
is the resistance temperature coefficient. The resistance temperature coefficient is determined by the device’s chemical element. Since a RTD is typically made from platinum, usually
$$\alpha=0.00385^{\circ}C^{-1}$$
.
Platinum
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