Microchip Technology Humidity Sensor PICtail Spécifications télécharger pdf (Page 80)

Figure 30 Output Signal in mV vs. Absolute Humidity in g/M

for Thermal

Conductivity sensors (Reprinting Permission Requested from Questex

Media Group LLC)

Another name for the Polymer sensor is a Capacitive Humidity sensor. These

sensors calculate the change in the electrical impedance using an ammonium

salt substrate. The resistance of a humidity sensor is directly proportional

according to its relative humidity.

Figure 31 shows the linear correlation between capacitance and relative humidity

for Capacitive Humidity sensors. This graph was taken with a reference

measurement at 25 degrees Celsius.

Figure 31 Capacitance of the capacitors in (pF) vs. Absolute Humidity for

Thermal Conductivity sensors in (%) (Reprinting Permission Requested

from Questex Media Group LLC)

In choosing the best humidity sensor some of the important concerns or

questions that people come across are how accurate or precise the sensor is,

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Microchip Technology Humidity Sensor PICtail Spécifications Page 80