Patent ID: 7526956

Claim:
A measuring device for measuring the humidity of materials, particularly textiles, comprising an evaluation circuit EC having electrical terminals ( 8 , 9 ) connectable to an electric load, and an oscillatory circuit ( 5 ), and comprising: a primary electrical circuit ( 1 ) comprising a first ferromagnetic element ( 3 ) having a first electric coil ( 4 ) wrapped around, said first coil being electrically powered by said oscillatory circuit ( 5 ); a secondary electrical circuit ( 2 ) comprising a second ferromagnetic element ( 6 ), contactlessly facing the first ferromagnetic element, having a second electric coil ( 7 ) wrapped around, said second coil ( 7 ) being in electrical communication with said evaluation circuit EC, at least one of said first and second ferromagnetic elements ( 3 , 6 ) being rotatable with respect to the other; switching means ( 10 ), provided in said evaluation circuit EC, for intermittently short-circuiting the second coil ( 7 ) a number of times dependent on the electrical resistance of the electric load connected to the electrical terminals ( 8 , 9 ); output means ( 11 ) for outputting signals in response to the short-circuiting frequency of the switching means ( 10 ).