| 摘要 |
PURPOSE:To prevent overheating in a liquid by paralleling the direction of a line connecting both electrodes of a detecting element consisting of a positive characteristic thermistor to a liquid level and making it possible to indicate a continuous change of the liquid level with simple constitution. CONSTITUTION:When the whole of the long-sized detecting element 6 consisting of the positive characteristic thermistor is in the air, the heat dissipation coefficient is reduced and the element 6 generates heat for itself and attains thermal equilibrium with high temperature. On the other hand, the resistance of the element 6 is reduced when the whole element 6 is in gasoline. Then, an electric current value of the element 6 is changed in a straight line as the element 6 is dipped in order from its end part. The change of the liquid level can be continuously indicated by reading the change of the electric current. In this case, the element 6 is fixed so that the direction of the line connecting the electrodes 7 provided to both main surfaces of the thermistor is paralleled to the liquid level.
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