Standard Platinum Resistance Thermometer (SPRT) • SPRT allows strain-free wire expansion and contraction, but is susceptible to damage and shift. • Strain increases resistance, while annealing returns the platinum's crystal lattice to its original state. • High energy impact strain requires high temperature, but the maximum temperature is 670°C for a 25 Ohm SPRT. • Ideal anneal cycle: 670°C for 2 hours, 450°C, soaking for 30 minutes, and measurement at the triple point of water (TPW). • W values for SPRT should remain constant, checked by calculating the ratio of resistance at gallium point to water triple point. • Programmable bridge SPRT should update data with a current RTPW value to minimize temperature display errors.