| 摘要 |
<p>PURPOSE:To secure the steady detection of the humidity although the temperature, the humidity, the amount of the wind and other factors may change at the detecting area by giving differentiation to the signal change obtained through the humidity- sensitive resistor and then selecting the differential time constant in accordance with the conditions of the using atmosphere. CONSTITUTION:A closed circuit is constituted with humidity-sensitive resistor 1 composed of the oxide ceramic humidity-sensitive resistor, oscillator 2 and resistor 3. And the inter-terminal voltage of resistor 3 is converted into the direct current through AC-DC converter 4, and the output voltage of converter 4 is differentiated by differentiating circuit 5. When the differential output of circuit 5 exceeds the set level, the output is produced at terminals 7 and 8 via voltage comparator 6. As a result, the humidity leak can be detected even with fluctuation of the atmospheric conditions, thus ensuring the steady detection for the moisture even at a high temperature.</p> |
