humidity sensor HS12P-15P
Relative humidity sensor is HS12P/HS15P (Relative Humidity) with operating temperature of 0-50 ° C. HS12P chosen as the sensor for this type of quick response, while HS15P for type waterproof sensor. HS12P operate in humidity from 20 to 90% RH (no condensing) while HS15P 20 -100% RH. Ideally given AC voltage 1V rms and 0.3 mW power consumption. Do not give a DC voltage or DC bias directly to these sensors.
In accordance with the laws of Dalton, the total air pressure is the sum of the partial vapor pressure of its components, and water vapor pressure is the partial pressure of water vapor as the formula below:
daltons law
If the water vapor pressure equal to saturation vapor pressure, condensation will occur. Mathematically, relative humidity can be represented by the ratio of partial pressure of water vapor divided by the saturation vapor pressure as a percentage.
Another important concept is that of relative humidity or dew point Dew point, namely the temperature where the moisture in the air will condense. Example if the air has a temperature of 40 ° C, and 50% relative humidity, condensation will occur when the air down to 27.6 degrees Celsius. At the Dew Point, RH value is 100%. The following figure shows the condition of Dew Point.
dew point condition
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