Heated Salt-Solution Method for Humidity Measurement

Authored by: Ghenadii Korotcenkov

Handbook of Humidity Measurement

Print publication date:  February  2019
Online publication date:  January  2019

Print ISBN: 9781138300224
eBook ISBN: 9780203731888
Adobe ISBN:

10.1201/b22370-6

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Abstract

The method of heated salt solution is based on the condensation method. The saturated salt lithium chloride sensor has been one of the most widely used dew-point sensors. A solution of lithium chloride is extremely hygroscopic under typical conditions of surface atmospheric humidity; if the ambient vapor pressure exceeds the equilibrium vapor pressure of the solution, the water vapor will condense over it and change its conductivity. This means that the conductivity of the solution is an indication of the relative humidity in the air. The popularity of this method stems from its simplicity, low cost, and durability, and the fact that it provides a fundamental measurement. This chapter analyzes features of the operation of such sensors and their design. The focus is on the Dunmore cell. Limitations of LiCl-based humidity sensors are also considered. Planar LiCl-based humidity sensors are also described in this chapter.

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