Flow monitoring device
US4480467A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1982 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Nov 29, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/698
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The flow monitoring device comprises a housing having a passageway therethrough for liquid flow through the housing. The passageway has an inlet opening and an outlet opening. A first thermistor is provided for sensing the temperature of the liquid in the passageway at a place near the inlet opening. A heating resistor is provided for heating the liquid at a place near the outlet opening and a second thermistor is provided for sensing the temperature of the liquid at the place near the outlet opening. A control circuit controls the input of heat energy to the heating resistor for heating the liquid just enough to maintain a predetermined temperature differential between the first and second thermistors. The passageway has a first larger-in-cross-section passageway portion at the place of the first thermistor for enhancing temperature sensing, a second larger-in-cross-section passageway portion at the place of the second thermistor for enhancing temperature sensing and a smaller-in-cross-section passage between the first and second larger passageway portions to cause a higher flow rate between those portions to thermally isolate those portions thereby to minimize, if not altogether …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.