A water content detection sensor includes a circuit member in which low resistance conductors1,2 disposed in parallel to each other and a high resistance conductor3 connecting end portions of the respective low resistance conductors, a carrier body4 having a water-proof property and an insulating property, and a coating body5 having a water-proof property and an insulating property, the circuit portion being disposed between the carrier body and the coating body. A plurality of exposure holes6 are formed to the carrier body or the coating body so as to expose the low resistance conductors at plural portions, and when water content adheres between the exposure holes and the low resistance conductors are then short-circuited in a current conduction state, a current value is made larger than that before the adhesion of the water content. When a small current passes, it is judged that the circuit is normal, and on the other hand, a large current passes, it is judged that water is generated.本發明之水分檢測感應器,包含並列地延伸的低電阻導線1、2及連接於低電阻導線之端部間的高電阻導線3之電路部,被包夾於同時具有防水性及絕緣性之支撐體4及覆蓋體5之間,而使低電阻導線於多處露出的露出孔6,則形成於覆蓋體。電流在電路部流動的狀態下,水分若附著在露出孔間而導致低電阻導線間發生短路時,使電流值變得較在水分附著前為大,於小電流流動時判斷為電路正常,而於發生短路而流有大電流時則判斷為產生有水分。因而能夠預先判斷水分檢測感應器之良否。1、2...低電阻導線1a、2a...延長部3...高電阻導線4...支撐體5...覆蓋體6...露出孔7、8...導線9a、9b...水分通過孔
