Almost all of the humidity sensor drift and temperature drift are present.
Because of the humidity sensor must contact and atmospheric water vapor, so can't seal.
This determines its stability and life is limited.
In general, the effective use of production vendors will indicate one calibration time is 1 year or 2 years, due to be responsible for the calibration again.
Users to consider when choosing sensor, please to calibrate channel in the future, do not covet is cheap or superstition foreign goods and ignoring the after-sales service to ask.
Temperature drift had mentioned in section 1.
Choose humidity sensor want to consider the temperature range of applications, see the selected sensor can work normally under the specified temperature, temperature drift is beyond the design target.
To alert the user that the capacitive humidity sensor temperature coefficient alpha is a variable, which vary with temperature and humidity range.
This is because water and polymer dielectric coefficient changing with temperature is out of sync, and temperature coefficient alpha depends mainly on the dielectric coefficient of water and moisture materials, so the temperature coefficient of capacitive moisture sensor is not constant.
Capacitive humidity sensor at room temperature, small temperature coefficient of wet in *, 5 -
25 ℃, the temperature drift of low humidity in negligible.
But in high temperature and high humidity area or negative temperature high humidity area to use, it must consider the influence of temperature drift, the necessary compensation or correction.
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