| 摘要 |
A low-liquid level indicator particularly adapted for use in an automotive vehicle which employs an oscillator whose tank coil is shunted by a probe adapted to be immersed in a liquid. When the liquid level is satisfactory, the probe is immersed in the liquid and its impedance will be relatively low thereby reducing the Q of tank circuit to a value where no oscillations will be produced. When the liquid level falls to an unsatisfactory level, the probe will no longer be immersed in the liquid, and its impedance will be increased sharply thereby resulting in oscillations being produced by the oscillator. This change, between the nonoscillatory and the oscillatory states, is sensed by a solid-state switching network which controls the energization of a warning means, preferably in the form of a lamp. The warning means is energized when the probe is not immersed in the liquid and the oscillator is in an oscillatory state.
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