Temperature vs. Resistance Tables for Resistance Temperature Detectors (RTD) 1 Figure 1 ¾ Pyromation’s Standard Element Connections      2-wire single          2-wire dual          3-wire single           3-wire dual         4-wire single           4-wire dual Page 1     List of Tables Following is a list of the resistance temperature detectors tables included in this reference manual. Table      Type               alpha                Range 27 Limits of Error 28    Classification of Tolerances 29 Pt Platinum a=0.00385 -200 to 660 °C 30 Pt Platinum a=0.00385 -328 to 1220 °F 31 Pt Platinum a=0.00392 -200 to 660 °C 32 Pt Platinum a=0.00392 -328 to 1220 °F 33 Cu Copper a=0.00427 -200 to 260 °C 34 Cu Copper a=0.00427 -328 to 500 °F 35 Ni Nickel a=0.00672 -80 to 260 °C 36 Ni Nickel a=0.00672 -112 to 500 °F 37 Ni-Fe Nickel-Iron   a=0.00518 -200 to 204 °C 38 Ni-Fe Nickel-Iron   a=0.00518 -328 to 400 °F This    reference    manual    consists    of    reference tables that give temperature vs. resistance relationships for resistance temperature detectors for Platinum, Copper, Nickel, and Nickel-Iron sensors.   These tables give ohm values from one to three decimal places for each degree of temperature.  Such tables are satisfactory for most industrial uses but may   not   be   adequate   for   computer   and   similar applications.      If   greater   precision   is   required,   the reader should contact the manufacturer for equations which   permit   easy   and   unique   generation   of   the temperature vs. resistance relationship. 1 All temperature vs. resistance data in Tables 29 to 36 have been developed from wire manufacturers’ data. Table 28 ¾ Classification of Initial Tolerances2 Use given equations to calculate tolerances at specified temperatures: A = ± [ 0.03 + 0.0017 çt ç] °C B = ± [ 0.08 + 0.0017 çt ç] °C C = ± [ 0.26 + 0.0042 çt ç] °C where: ç t ç = value of temperature without regard to sign, °C. Note 2 ¾ The equations represents values for 3-wire and 4-wire PRT's.Caution must be excercised with 2-wire PRT's due to lead wire. Table 27 ¾ Limits of Error for RTDs Initial Tolerance @ 0 °C Type   ± 0.01%    ± 0.03%    ± 0.1%    ± 0.2%    ±0.5% Pt · A · B · C Cu                  · Ni · Ni-Fe · A, B, C see Table 28