The sensing element is located at the tip of the temperature sensor that is exposed to the process temperature. The sensing element responds to temperature by generating a measureable resistance change or a voltage signal that increases as the temperature increases. Sensors can be provided with either one or two elements in one sensor sheath. Dual elements provide a redundant measurement that may be useful for not back-up, for drift monitoring using a comparison technique, or to provide inputs to two independent controllers or systems (control system or safely system)