Liquid sensor
US4011536A · kind A · utility
1Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1974 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Nov 25, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/183
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A sensor which utilizes the difference in thermal characteristic between two fluids to detect the presence of one fluid or the other. A continuously heated thermal expansion element activates a switch. When the element is brought in thermally conductive contact with a liquid, the heated element drops in temperature, shortening the length of the expansion element and activating the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.