A liquid exposure sensing device (100, 300), comprising: a first sensor coupled to a reference material, wherein the first sensor is configured to generate a first signal in response to either a liquid phase and/or vapor phase of a substance passing through the reference material; a second sensor coupled to a material exposed to an environment, wherein the second sensor is configured to generate a second signal in response to the liquid phase and/or vapor phase of the substance passing through the material exposed to the environment, wherein: the first and second sensors are impedance sensors and the first and second signals are impedance signals; the first and second sensors are capacitive sensors and the first and second signals are capacitive signals; or the first and second sensors are conductive sensors and the first and second signals are conductive signals; characterized in that a controller is coupled to the first and second sensors and configured to: measure the first and second signals at predefined time intervals; and generate a liquid detection signal in response to a time delay (502, 506, 702, 802, 806) between the first signal and the second signal that exceeds a threshold time delay (504, 508, 704, 804, 808). a first sensor coupled to a reference material, wherein the first sensor is configured to generate a first signal in response to either a liquid phase and/or vapor phase of a substance passing through the reference material; a second sensor coupled to a material exposed to an environment, wherein the second sensor is configured to generate a second signal in response to the liquid phase and/or vapor phase of the substance passing through the material exposed to the environment, wherein: the first and second sensors are impedance sensors and the first and second signals are impedance signals; the first and second sensors are capacitive sensors and the first and second signals are capacitive signals; or the first and second sensors are conductive sensors and the first and second signals are conductive signals; characterized in that a controller is coupled to the first and second sensors and configured to: measure the first and second signals at predefined time intervals; and generate a liquid detection signal in response to a time delay (502, 506, 702, 802, 806) between the first signal and the second signal that exceeds a threshold time delay (504, 508, 704, 804, 808). the first and second sensors are impedance sensors and the first and second signals are impedance signals; the first and second sensors are capacitive sensors and the first and second signals are capacitive signals; or the first and second sensors are conductive sensors and the first and second signals are conductive signals; characterized in that a controller is coupled to the first and second sensors and configured to: measure the first and second signals at predefined time intervals; and generate a liquid detection signal in response to a time delay (502, 506, 702, 802, 806) between the first signal and the second signal that exceeds a threshold time delay (504, 508, 704, 804, 808). measure the first and second signals at predefined time intervals; and generate a liquid detection signal in response to a time delay (502, 506, 702, 802, 806) between the first signal and the second signal that exceeds a threshold time delay (504, 508, 704, 804, 808).