The humidity of the atmosphere is determined by electrolytic sensors, in each of which there is a container where the air of the residential compartment is in contact with a saturated aqueous solution of hygroscopic salt. The principle of action of the sensor is based on the fact that between the partial pressure of the water vapor of the analyzed air and the vapor of the solution, a hygro-thermal equilibrium is established. As a result, the concentration of the solution (due to evaporation or absorption of additional moisture) changes. Two electrodes are placed in the salt solution, to which alternating voltage is supplied. With a change in the concentration of the solution, its electrical resistance changes, and hence the value of the current passing through the solution and the temperature of the solution. Measuring this temperature, they receive information about the partial pressure of water vapor.
Determined by electrolytic
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