G - Physics – 01 – F
Patent
G - Physics
01
F
340/141, 73/69
G01F 23/26 (2006.01)
Patent
CA 1045228
ABSTRACT A liquid level gauge for monitoring the height of liquid in a storage tank or the like. The gauge comprises an upright conduce- ing probe adapted to be immersed in the liquid in the tank, and an upright series of electrodes closely adjacent the probe. The latter is adapted to be excited from a source of a.c. voltage generated by an eatable multivibrator. Each of the electrodes is connected to the input of an amplifier through a rectifier circuit. The amplifiers are of t he digital comparator type and have output terminals respectively connected by means of ???ing resistors to an electrical indicator such as a milli?mmeter, which provides an indication of the number of amplifiers being driven to full output at any particular time. Alternately, the comparators can be em- ployed to drive light-emitting diodes which provide a digital read- ing of the level of liquid in the tank. The arrangement is such that each of the electrodes constitutes one plate of a capacitor, the other plate being formed by the single upright conducting probe. When a particular electrode is above the level of fluid in the tank, the magnitude of the a.c. signal received at the elec- trode is of a sufficiently small magnitude to provide only a low level drive voltage to its respective comparator amplifier, the latter thus assuming a low output signal level. Once a particular plate becomes submerged, the increased dielectric constant (fluid) effects an increase in the value of the capacitor, and a corres- pondingly larger drive signal to the amplifier results, causing the output thereof to assume a high level and yielding a contri- bution to the water reading through the respective ???ing re- sistor. The meter reading thus responds to the number of elec- trodes submerged at any particular time, and provides an indication of the liquid level in the tank. The advantage of the present device over prior devices is that either an analog or a digital reading can be obtained from the same apparatus with only slight modification required. Also, readings are independent of the character of the fluid or liquid being gauged.
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