Flow measurement device
US4938072A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Jul 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flow measuring device for checking on medical infusion devices comprises a vertical tube 5 having at least three level sensers 10 and 11 for sensing when a liquid reaches the level of each senser. A logic unit 12 containing a timing device triggered by the first senser measures the time taken for the liquid to reach the second senser and the logic unit compares this time with a predetermined time and if the time is less than the predetermined time sets the device to compare a time taken to reach the third senser but if the time is more than the predetermimed time calculates the flow rate. A multiway valve 1 at the inlet of the device under the control of the logic unit permits flow from the infusion device under test to the tube, from the device under test to a drain 15 or to that drain and the tube, or from the tube to the drain or blocks all flows. The logic unit can sense an excessively rapid flow and treat the flow as a dummy run to be dumped without measurement and summon a subsequent flow to be measured. The tube can be linked to the drain by a pipe 14 so that measurement can take place against a back pressure. A succession of measurements are averaged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.