I've been using the same code for nearly 15 years but no one can tell me why we use what we use.
We're using the following for our program:
RelativeHumidity(i) = ((0.032258*(RelativeHumidity_mV(i)))-25.80645)/(1.0546-(0.00216*RHTEMP(i)))
I know where the second half of the equation came from but have NO idea where we got 0.032258 as the multiplier and -25.80645 as the offset. I've only seen it used in our applications and in someone's thesis (who also didn't cite where the multiplier and offset came from).
I've scoured the internet and have only concluded that in some cases 0.032258 had something to do with beer barrels which, uh, is not my application.
If anyone has any idea I'd be much appreciative.