Non-polar solvents in low concentrations have minimal to no interaction with functional groups of the polymer when exposed in limited quantities. Thus, chemicals such as cyclopentane or Toluene have negligible impact on sensor accuracy. This is shown in Figure 2-2. Non-polar molecules do not penetrate deep into the polymer matrix and have a relatively small impact on RH output. Since the non-polar molecules are still taking the place of water vapor molecules in the polymer voids, they do slightly reduce the RH output.

Figure 2-2 Small Shift in RH Accuracy from Non-Polar Contamination