Relative humidity, or RH, is the percentage of moisture in the air referenced to the maximum level of moisture the air can hold at that temperature and pressure.

This humidity sensor consists of 2 copper conductors that are located at small distance from each other. The relay switches as soon as the moisture makes a connection that is more or less electrically ...

The sensor acts as a capacitor (C1) whose value varies from 180 to 220 pF for relative humidity in the range of 0% to 100%. The sensor is linear within ±3% of full scale.

Sensirion has announced a new humidity sensor with a temperature sensor and signal processing circuits on the same chip, a design that shields the device against noise.