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I was wondering it's possible to calculate a formula from the graph that I have attached below. (the purple line 85% RH can be ignored)

  • coefficient = 1.7 at -10 degrees and 33 RH
  • coefficient = 1.4 at 0 degrees and 33 RH
  • coefficient = 1 at 20 degrees and 33 RH
  • coefficient = 0.9 at 50 degrees and 33 RH

I would need the formula so that I could calculate the coefficient at any temperature knowing only Ro, Rs and the temperature.

E.g. how much will the coefficient be at -5 degrees? or how much at +15 degrees?

this is the image of the graph

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    Do you know if it should be linear? quadratic or exponential?2012-09-24
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    unfortunately I do not have this information, the only datasheet has that piece of informartion from -10 to +50. The good thing is that I won't need to use any values that are above +50 or below -102012-09-24

2 Answers 2