Specifications

72
Figure 30 Output Signal in mV vs. Absolute Humidity in g/M
3
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,