Capacitive sensing monitor and method therefore
US6885306B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2003 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Nov 7, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P13/0006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A monitor for monitoring presence or absence of a liquid product in a system for pumping the liquid product from a supply through tubing. A capacitive sensor is coupled to the outside of the tubing at a sensing location having an inlet and an outlet, the capacitive sensor being responsive to the presence or absence of the liquid product in the tubing. The tubing is selected from a material and having an inside diameter at the sensing location selected such that the tubing is substantially evacuated or substantially drains when the liquid product is substantially absent from the tubing preceding the sensing location but small enough so that the liquid product can be sensed by the capacitive sensor when the liquid product is substantially present in the supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.