CAPACITIVE MOISTURE SENSOR

摘要

A capacitive moisture sensor includes insulator means (22); capacitance means including a sensing capacitor having as plurality of spaced capacitive sensor conductors (14) mounted with the insulator means for exposure to the atmosphere; and first (26, 28) and second electrodes (44, 46) mounted with the insulator means remote from the spaced capacitive sensor conductors; means for applying a periodic input current across the first and second electrodes; and means for detecting a change in capacitance between the first and second electrodes indicative of moisture bridging at least two of the capacitive sensor conductors.