Abstract
We have designed and constructed a simple apparatus for continuous recording of sweating rate utilizing a hygrometer of electrostatic capacity type.
The present device consists of the following 3 parts: a plastic skin capsule equipped with a hygrometer and a multivibrator, a F/V converter circuit and a pen-recorder. The distinct feature of the new apparatus is summarized as follows.
(1) The capsule is small in size and easy to put use.
(2) Dry air was passed through the lumen of the capsule via an air inlet tube at a fixed flow rate in order to remove the vapor generated by in sensible perspirations.
(3) A linear relationship between the amount of evaporated water in the capsule and output voltage (1mV/1mg/5min) was obtained.
A few results of the preliminary application of this apparatus to human beings are presented.
