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3. Calculation of coil temperature rise when R initial and R final are known: Delta T = (234.5 + T1) (R2/R1 - 1) Delta T = Temperature rise (°C) T1 = Initial temperature (°C) R1 = Initial resistance (Ohms) R2 = Final resistance (Ohms) R2 = K2R1 Temperature can also be found by making the R2/R1 ratio = the coefficient of correction graph in Fig. 2, and then finding the corresponding temperature. Fig. 2 Catalog indicates coil resistance of 290 ohm at 25°C. What is the value at 125°C? From the chart: 290 x 1.39 = 403.31 Ohms. |
| Date of issue: 6/00 | - 16 - | Page 2 of 2 |