probes will show sensitivity to smaller variation on the coating surface however the average measurement from the optical probe over a larger area will give similar results as the capacitance differences between the capacitance and optical probe reading can then be attributed to moisture content in the film provided the dielectric constant of the coating is known an infrared ir temperature probe such as omega stamford conn model o536 3 t 240f can provide useful information on the temperature profile of the creping cylinder since pem 39 s will respond differently depending on temperature temperature information can be used to adjust the chemical composition and level of pems applied to the cylinder in one embodiment the method further comprises a applying an ir temperature probe to measure the temperature profile of the creping cylinder b applying an ir temperature probe to measure the coating temperature needed to correct for the temperature dependent moisture dielectric constant and c applying the corrected moisture dielectric constant to the capacitance measurement to determine the correct coating moisture concentration the addition of the ir temperature probe in the sensor module provides information on the temperature profile of the crepe cylinder this is useful in identifying temperature non uniformities on the crepe cylinder in addition the temperature can be used to correct the dielectric constant of the coating for example the dielectric constant.