Well not for psychrometric calculs... I want to evaluate the airflow of the mechanical ventilation system and I need to convert the humidity to absolute

Yes I did that many times, and I just retried, but i found out that the domoticz don't start the script on sensors events (new data).
I had to specify wich sensor name to make it work, but this mean I have to duplicate the script for each sensor.

Hello rrozema, Thank you for shearing, this is very usefull. I tried to activate it through the Events menu but it not working. I can't find the issue after 2 hours of troubleshooting and testing. Could you be more specific about the scripts window in Domoticz please? Maybe it's only a version ...