Contactor device has elastic waves of lamb for the detection of the presence of a liquid at a predetermined

摘要

The contactor device for detecting the presence or absence of a liquid 2 to a predetermined level n in a tank 1, comprises a transmission transducer 51, 51 '; 61, a reception transducer 52, 52'; 61 and electronic means 100 for processing the signals applied to the transmission transducer 51, 51 '; 61, and delivered by the receiving transducer 52, 52'; 61. / p & & p & the device comprises, in the vicinity of said predetermined level n of said reservoir 1, a plate of detection 50; 50 ′, 60, at least one face 58 is capable of being placed in contact with the liquid 2 and which bears on the one hand, the transmission transducer 51, 51 '; 61 arranged so as to generate locally the lamb in said plate 50, 50 ′, 60 and, on the other hand, the receiving transducer 52, 52'; 61 arranged so as to detect the presence or absence of a lamb waves transmitted along the said plate 50, 50 ′, 60.