Resistance Temperature Detectors (RTD’s) are used in many process and laboratory applications where high accuracy and repeatability are of major importance. Characteristically, RTD’s provide a stable sensor that meets the above criteria through a rather broad temperature range. RTD elements are available in many different materials and with different temperature coefficients. The most commonly used element is a wire wound, or thin film element, conforming to the DIN standard and with a .00385α temperature coefficient.