Vishay BCcomponents' capacitive sensor for humidity measurements in applications like electronic hygrometers and self-regulating air humidifiers, etc, consists of a non-conductive foil, which is covered on both sides with a layer of gold. The dielectric constant of the foil changes as a function of the relative humidity of the ambient atmosphere and, accordingly, the capacitance value of the sensor serves as a measure for relative humidity.
The foil is clamped between contact springs and assembled in a plastic housing. It is provided with two connecting pins which fit printed-circuit boards with a grid pitch of 2,54 mm, provision is also made for fastening with 3 mm bolts. The characteristics are not affected by incidental water condensation on the sensor foil. The device can be soldered directly on to a printed-circuit board or fastened with 3 mm bolts.
The humidity range (RH) is 10 to 90% and capacitance at +25°C; 43% RH; 100 kHz is 122 PF ±15%. Maximum AC or DC voltage is 15 V.
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