Calculate RH of moist air at higher temp ranges accurately?

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Calculate RH of moist air at higher temp ranges accurately?

Hey there :)
Im using the Magnus relation for calculating the RH of air (sat pressure the RH) only to find it works good only for temperature ranges upto 100°C (with corrections to original Magnus relation!)
Does anybody know a better method to calculate RH accurately (or thru Psychrometric charts-all charts I found have ranges upto 55°C only)??
Any help is welcome!
Thnx in advance :biggrin:
 
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wet bulb thermometer, dry thermometer and chart. Only way for the average engineer to do it.
 

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