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    • 4. 发明专利
    • HUMIDITY-SENSITIVE DEVICE
    • JPS62209348A
    • 1987-09-14
    • JP5138586
    • 1986-03-11
    • TOYAMA PREFECTURENIPPON MINING CO
    • ASADA MINEOYANO KATSUMITAIHICHI MASAAKIKIUCHI NORIHIRO
    • G01N27/12G01N27/02
    • PURPOSE:To prevent the deterioration of a humidity-sensitive element by adjusting the amplitude of the false sine wave signal applied to a humidity- sensitive element to the level in the tolerant pressure resistance value range of the element, by providing a clamp circuit between a power source circuit and a sine wave signal generating circuit. CONSTITUTION:A current is supplied to a humidity/electric signal converting circuit 9, a peak holding circuit 11, a logarithmic converter circuit 13, a temp. correcting circuit 15 and a temp. sensor 17 from the power source circuit 1 of a humidity-sensitive device to process the humidity signal from a humidity sensor 7. The level of voltage supplied to said sensor 7 from the circuit 1 is clamped by a clamp circuit 3 and this clamped power is applied to a sine wave signal generating circuit 5 and the amplitude of the false sine wave signal generated from the circuit 5 is clamped. The amplitude of the sine wave signal applied to the humidity-sensitive element of the sensor 7 is adjusted to the level in the tolerant range of said element to prevent the deterioration of the element.