G - Physics – 01 – F
Patent
G - Physics
01
F
340/141, 340/143
G01F 23/24 (2006.01) G01F 23/26 (2006.01)
Patent
CA 1056932
ABSTRACT A device for indicating the presence or absence of liquid at a single level in a tank, comprising a sealed cylindrical housing having one end wall permanently fixed and the other end wall removable. The housing has an internal shoulder against which the removable wall is seated. The latter has an annular recess extending about its periphery in which there is disposed an O-ring, adapted to sealingly engage the housing wall adjacent the shoulder and thus effect a watertight seal therewith. The removable end wall also carries at its outer side two concentric, conductor tubes on feed-though insulators, constituting a probe whose conductive or capacitive character- istics vary according to whether the tubes are submerged or dry. The circuitry employed with the probe is disposed inside the housing and includes a signal generator for applying signals to one part of the probe, and amplifier circuitry for receiving signals from another part of the probe. Means are provided for selecting either a.c. or d.c. signals at the output of the generator, enabling the gauge to be used with either dielectric fluids or conductive fluids respectively. The advantage of the present device over prior gauges is that an especially compact and rugged assemblage is realized, with the supply and signal leads which extend from the housing all being characterized by very low impedance, thus making them highly immune to stray pick-up, hum and the like.
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