| 摘要 |
PURPOSE:To obtain an inexpensive liquid level meter having a simple structure and capable of displaying the continuous change in a liquid level, by bringing two common electrode plates and the electrodes of positive characteristic thermistors to a conductive state. CONSTITUTION:A detection element 9 has a low heat radiation coefficient when the whole thereof is present in air and generates heat itself to reach heat equilibrium at high temp. Then, the resistance value of the element 9 becomes high and the current flowing thereto is min. At this time, common electrode plates 8 come to heat dissipating plates even when the position of a liquid level is present between adjacent positive characteristic thermistors 6 and the change of a current is alleviated and a current changes continuously. As mentioned above, a current changes continuously corresponding to the liquid level and the value thereof is read by an ammeter 11 to make it possible to know the liquid level. By this method, the continuous change in the liquid level can be displayed inexpensively by the reduced number of thermistors 6 without using a special amplifying circuit.
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