In the curves below the polynomial coefficients are given as calculated in EXCEL.
SOMANET Node has an input resistance of 20.4 kΩ (for the single-ended analog input). This resistance is in
parallel with the temperature sensor (PT1000). So the curve has to be redrawn with parallel input resistance in
order to calculate the polynomial function coefficients.
The equation below is related to the PT1000 temperature curve vs. PT1000 resistance|| Input resistance .
Temperature = -244 + 0.238x + 1.49E-05x² + 3.72E-09x³
a = -244, a = 0.238, a = 1.49E-05
The image shows how to add the coefficient in Node.
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