Liquid sensing system
US4733560A · kind A · utility
15Cited by
22References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Aug 13, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/244
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid level sensing system having a sensing head with a pair of mutually insulated metal electrodes, one of the electrodes connected to the output of an amplifier and the other to the input. The gain of the amplifier is sufficienty high such that it will oscillate when the electrodes are immersed in a liquid and will be non-oscillatory when the electrodes are in air. The oscillation of the amplifier is detected to produce a signal corresponding to the presence of a liquid and also its characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.