Method and device for monitoring the operational state of a reservoir, for example an ink reservoir
US6164744A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1998 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Jun 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/802
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In order to monitor the state of a reservoir made of electrically insulating material containing a normally electrically conductive product, ink for example, the free end of the outlet channel of the reservoir is connected to a predetermined potential and two measurement procedures are defined, the first of which results in a first measurement signal, a characteristic of which varies mainly with the quantity of product contained in the storage cavity of the reservoir, and the second of which results in a second measurement signal, a characteristic of which varies mainly with the electrical conductivity of the channel between its ends. During the measurements, an abnormality correction procedure (or a simple alarm procedure) is triggered when the characteristic of the second measurement signal indicates a low electrical conductivity of the channel (absence of product) whilst the characteristic of the first signal indicates that there is still product in the storage cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.