1. Platinum (Pt): This is the most common metal used in RTDs due to its high purity, excellent stability, and predictable resistance changes with temperature. Platinum RTDs are known for their accuracy and are often used in precision applications like calibration and scientific instruments.
2. Nickel (Ni): Nickel RTDs are less expensive than platinum RTDs and offer good temperature sensitivity. However, they are not as stable or accurate as platinum RTDs and are typically used in applications where cost is a major factor.
3. Copper (Cu): Copper RTDs are even less expensive than nickel RTDs and are often used in industrial applications where cost is a primary concern. However, they have lower stability and accuracy compared to platinum and nickel RTDs and are generally limited to lower temperature ranges.
