Method and system for sensing a liquid level
US10295390B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2016 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | Aug 10, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/266
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present application relates to a system (10) for sensing liquid level in a receptacle (16). The system comprises a capacitive sensing probe (12), for sensing a capacitance between the capacitive sensing probe (12) and an electrically conductive portion of the receptacle (16). The system also comprises a control circuit (15) connected to the capacitive sensing probe (12) for detecting a level of the liquid in the receptacle (16) based on said capacitance, a non-isolated AC power supply (11) arranged to power the control circuit (15), the non-isolated AC power supply (11) having an electrical connection between its input and its output, and at least one filter capacitor (C1, C2) connected in series between the capacitive sensing probe (12) and the control circuit (15).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.