The nearly linear resistance versus temperature relationship for any PTS sensor is accurately modeled using the set of equations shown here (temperature range dependent) with the known values (R0, T, A, B, C). R0 represents the nominal resistance at 0°C, T represents temperature in °C and A, B, and C represent the Callendar-Van Dusen constants that are derived from actual resistance measurements. Figure A shows a graph of the R vs. T relationship (R/R0 ratio versus temperature). A complete table outlining the R vs. T relationship in 5°C increments is available in the PTS datasheet.