A Device for Controlling Temperature and Relative Humidity in Small Chambers1

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Abstract
An experimental set-up that permits an accurate control of relative humidity and temperature of slow-moving air is described. The apparatus consists of 2 air-conditioning units delivering wet and dry air, respectively. By mixing appropriate amounts of both, 4 different humidities, whichever are desired, could be obtained simultaneously in 4 different exposure chambers. Variations in relative humidity normally remain within limits of ±0.2% RH, and have not exceeded ±0.3%. Humidity and temperature within the experimental chambers were measured by electronic sensing elements and continuously recorded on a multi-station recorder.

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