Use of capacitance for protecting against overheating of a water

Details Use of capacitance for protecting against overheating of a water Use of capacitance for protecting against overheating of a water

1989-07-14

1991-02-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324664, 324687, 219509, 219217, 219518, G01R 2726, H05B 102

Patent

active

049947508

ABSTRACT:
A protection device for a waterbed protects the water bladder and water heater from damage due to overheating when a dangerous condition, such as an insufficient level of water within the bladder or an element of the waterbed surroundings interposed between the bladder and the water heater, arises. The protection device employs a detector in the form of two capacitance plates placed adjacent to the water bladder and connected to a circuit which is operative to prevent power from being supplied to the water heater upon detection of a dangerous condition. The capacitance of the detector plates varies with the level of the water within the bladder and with the presence of a surrounding element between the bladder and heater.

REFERENCES:
patent: 3210607 (1965-10-01), Flanagan
patent: 4359626 (1982-11-01), Potter
patent: 4638305 (1987-01-01), Sutton
patent: 4639831 (1987-01-01), Iyoda
patent: 4652726 (1987-03-01), Femino et al.
patent: 4749988 (1988-06-01), Berman et al.

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