Measuring and testing – Liquid level or depth gauge
Patent
1981-11-02
1984-01-03
Gill, James J.
Measuring and testing
Liquid level or depth gauge
73304C, G01F 2328
Patent
active
044236280
ABSTRACT:
A method and apparatus are provided for monitoring the length of a liquid column such as the filling level of a beverage bottle. A predetermined high frequency signal is applied to a parallel circuit wherein, in one branch, a liquid column is connected by means of electrodes coupled to the ends of the column such that the column, i.e., a filled bottle, will produce more or less resonance in the first branch. The increase or decrease of resistance at resonance in the first branch will be reflected in a corresponding change in the power or current detected in the second branch. In instances where preset limit values are exceeded, an error is indicated and the improperly filled bottle is removed. When monitoring the filling level of beverage bottles, the latter are successively guided past the electrodes, with the upper electrode being coupled to the necks of the bottles through an air gap. The movement of the bottles through the monitoring station can be continuous and in this case, triggering of the operation of the monitoring station is effected in dependence on the position of the test bottle relative to the electrodes.
REFERENCES:
patent: 2523363 (1950-09-01), Gehman
patent: 4169543 (1979-10-01), Hall
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