Apparatus for measuring a flow rate of a powder
US8061217B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2008 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | Dec 22, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F15/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring a flow rate of a powder when a powder is conveyed by using air as a carrier gas, which apparatus measures the flow rate based on the change of capacitance of the powder to be measured. The apparatus that can measure the flow rate of a powder with high accuracy by compensating for the effect of the thermal drift of the capacitance. It includes a protecting pipe for conveying a powder, a housing pipe having measuring electrodes, and a transducer for outputting an output of the measuring electrode to a display. It further includes an atmospheric temperature sensor and a carrier gas-temperature sensor 31. The sensor 31 is directly fixed to the protecting pipe 20 at a place that does not overlap the housing pipe 10, and includes a circuit for compensating for the output of the measuring electrode, which output is the capacitance determined based on a graph of a curve of the relationship between a capacitance and a flow rate, based on the difference between the output of the atmospheric temperature sensor and the output of the carrier-gas-temperature sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.