This is a circuit for Dew Detector Probe circuit works on 5V dc supply. It is useful for checking the presence of dew (condensed moisture) inside sensitive electronic devices like VTR, camera, copier, computer etc. This is the figure of the circuit;
The principle of the ready made dew sensor element is based on the change in resistance of a conductive polymer in a thin film on a small ceramic substrate. As the sensing polymer wet (90 to 95% Relative Humidity), its resistance will increase drastically because the polymer expands and therefore causes a larger distance between the conductive particles. After successful construction, enclose the whole unit in a small aluminum tube.
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