Pump control
US4095920A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1975 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Sep 8, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7306
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A pump control for a pipeline milking system in which milk collects in a receiver and is pumped out periodically. The control has a liquid level sensing circuit connected with an electrode in the receiver. The sensing circuit includes a transistor amplifier, a source of alternating signal, a circuit connecting the source through the electrode and liquid with the base of the transistor and a sensitivity resistor connected in shunt with the transistor base. A timer actuated by conduction of the transistor controls the pump operation. The circuit has provision for control of the pump operation during washing with a switch selecting the milk or wash control electrode and selecting the appropriate time period for the timer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.