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8

The WMO report Instruments and Methods of Observation has a chapter on Measurement of humidity and a separate chapter on Measurement of upper-air pressure, temperature, humidity. The first deals with instruments used for surface measurements. The second deals with instruments used for measuring vertical profiles, which have to deal with a larger range of ...


6

We use something like an Onset HOBO electronic sensor. They've got logging (and in some cases, networking) built in. They'll typically log both temperature and relative humidity at regular intervals specified by the user. Humidity sensors have a tendency to wander off calibration, so you will need to take that into account when designing your monitoring ...


2

The Bureau of Meteorology in Australia traditionally uses wet and dry bulb thermometers read by humans, when measuring temperature. However, for remote automated weather stations, electrical equipment is used. The dry bulb temperature is measured using a resistance temperature device (RTD) and relative humidity is measured using relative humidity probe. The ...


4

I'm going to go old school with this one. The following pictures are the relevant pages from: Environmental Engineering in South African Mines, The Mine Ventilation Society of South Africa, 1989, pp 451-455. They give the psychometric equations that are required to calculate relative humidity from wet & dry bulb temperatures. For simplicity, I use the ...


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