Apparatus for metering sub-10 cc/minute liquid flow
US4532811A · kind A · utility
19Cited by
23References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1981 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Jul 6, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F13/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for accurately metering liquid flow based on the injection of a brief heat pulse into the flowing stream, e.g., via a miniature thermistor, and detection of an electronic time derivative of temperature downstream with, e.g., a second microprobe thermistor. This detection triggers a subsequent heat pulse and the cycle repeats, wth pulse total corresponding to elapsed liquid throughput, and pulse frequency to flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.