Batch dispensing system for fluids
US6499517B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 2002 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Apr 18, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F13/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for dispensing batches of fluid comprising a flowmeter (5), a pump or valve (6) for starting and stopping the flow and a controller (9) for controlling the pump or the valve. In order to reach a target batch size, the settling time at start of the flowmeter is compensated for as well as for the time it takes to stop the flow by generating a stop signal before the target batch size is reached. Further, to compensate for variations in the actual flow caused by variations in the feed pressure and the like, the compensation is made a function of the actually measured flow. A controller or a batch flow meter for use in dispensing batches is equipped with an interface for setting a compensating time constant and a correction unit for compensation of changes in the flow. The correction unit can consist of a differentiator an a summation circuit. Using digital techniques, the correction unit can be made as a lead filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.