Capacitance level sensor for a bilge pump
US4881873A · kind A · utility
31Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Dec 14, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D15/0218
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A bilge pump switch sensing the presence of bilge water by measuring the density of water by using an ultrasonic field penetrating the water, the field extending through the housing of the switch. Thus the internal elements of the switch are isolated from any contact with the water. The ultrasonic field detecting the presence of water activates sensing means in said switch housing to activate the pump, delay means being provided against false pump starts due to wave action as caused by a rocking boat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.