Including head-mounted Model TTH300 and field-mounted Model TTF300 that has configurable display, smart HART temperature transmitters offer sensor calibration and backup redundancy for 2 Platinum 100 resistance thermometers with 3-wire connections. Transmiters have sensor adjustments based on 1- and 2-point calibration or linearization via Callendar van Dusen equation. Measuring accuracy is ±0.1 K for Pt resistance thermometers along with long-term stability of ± 0.05% per yr.