Drop controller
US4460353A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1980 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Sep 8, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F13/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus controls the rate of passage of fluid drops through a drip controller in accordance with a preset rate. When the rate of passage of the fluid drops is less than the preset rate, a stepper motor is incrementally operated at progressive instants of time to open the drip chamber until the measured rate is equal to the preset rate. When the rate of passage of the fluid drops is greater than the preset rate, the stepper motor is operated instantaneously to close the passage through a number of increments corresponding to the difference in the measured and preset rates. An alarm is energized when the stepper motor is positioned to provide for a maximum flow of fluid and the rate is still below the preset rate. An alarm is also energized when the passage is closed and the preset rate indicates a desired flow of fluid. An emergency motor is also provided to control the opening in the passage. Before the operation of the apparatus is instituted, the stepper motor is operated to close the drip chamber. The emergency motor is then operated to open the drip chamber and thereafter close the drip chamber. The emergency motor may thereafter be operated to close the passage when the drop…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.