Analog hall-effect liquid level detector and method
US5636548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1994 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | May 16, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F25/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for measuring a liquid level by a float carrying one or more magnets and movably positioned adjacent spaced analog output voltage Hall-effect sensors. The apparatus is calibrated by moving the float relative to the sensors and measuring the voltage outputs of the sensors relative to the position of the float, and storing the measured values. After calibrating, the voltage outputs of any sensors activated by the presence of the float are measured and compared to the stored values to determine the liquid level. Preferably, the voltage output of at least two sensors are measured while the float is at one position for greater accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.