Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-11-20
1988-06-07
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340620, 73290R, 73304C, G08B 2100
Patent
active
047499885
ABSTRACT:
A non-invasive liquid level sensor assembly includes a pair of conductive band electrodes oriented in parallel, narrowly spaced relationship and disposed so that the gap between the electrodes corresponds to the liquid surface level to be detected. The electrodes are secured to the outer surface of a liquid container, and connected to a capacitive detector device which measures the change in electrical capacity between the conductors as the liquid rises or falls past the level of the gap between the electrodes. A shield electrode is also provided, disposed outwardly of and concavely about the sensing electrodes to eliminate sensitivity to masses outside of the container. In one embodiment the electrodes are secured with a sealed, arcuate housing which is adapted to be permanently or temporarily secured to the exterior of a liquid container by adhesive, removable straps, or the like. In another embodiment adapted for double-walled containers, the sensing electrodes are secured to the outer surface of the inner container, and the shield electrode is secured to the confronting interior surface of the outer container.
REFERENCES:
patent: 3588859 (1971-06-01), Petree
patent: 4002996 (1977-01-01), Klebanoff
patent: 4630245 (1986-12-01), Dam
Berman Allan
Miranda Henry R.
Cohen Howard
Imtec Products, Inc.
Jackson Jill D.
Orsino Joseph A.
Zimmerman Harris
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