I need to record temperature and humidity in an Environmental Cabinet. The cabinet has a Temperature control range of –40 to +150 and a Humidity control from 0 – 95% RH.
Most humidity sensors I have seen are only suitable for temperatures up to 85 deg C. I was thinking of using a Pico Logger and wet and dry thermocouples, but how can I convert them to RH in real time.
If you are talking, 40 to 150degC then our humidity sensor won't be able to cope with this either.
I can't remember the equations for relative humidity now (its been a while ). The correct terminology is Wet Bulb Temperature, try typing it into a search engine; I'm sure there will be a fair bit of information available.
Let me know if you find any good info.
Thanks for that, but what I was trying to find out was is it possible, in the pico log software, to use 2 channels, the dry and wet bulb temperatures, use them both into an equation with the result of an extra derived channel of RH in real time?
Where:
C3 is the wet bulb temperature in degrees centegrade.
C2 is the dry bulb temperature in degrees centegrade.
C4 equal to the height above sea level in metres.
(101.325*EXP(0.0001184*C4) (in red) is the air pressure in kPa. This section can be replaced by the barometric pressure if known.