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In this paper is presented a circuit for the relative humidity measurement. A humidity capacitive sensor of type HUMICOR 5000 (produced of CORECI firm) is used. This sensor transforms the humidity variations into capacitance variations. The measurement principle consists in the inclusion of sensor in a UA 555 oscillator, of which output frequency is dependent on the relative humidity. A frequency-voltage converter with Phase Locked Loop (PLL) is used for obtain a voltage dependent to relative humidity. The PLL using for the frequency-voltage conversion is a simple solution, which presents the advantage of a very low sensibility at noise that can affect the input signal. The simplicity of the proposed measurement circuit and the obtained results, a series of experimental results obtained by measurement and SPICE simulation presented in the paper, allows his utilisation in different applications such as environment monitoring, pharmaceutical industry, tile and brick drying, etc.

Measurement System of the Relative Humidity With Capacitive Sensor by CORECI 5000