Electro-optical liquid level sensor
US4354180A · kind A · utility
72Cited by
7References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1980 |
| Grant date | Oct 12, 1982 |
| Priority date | — |
| Expiry date | Dec 19, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A low liquid level electro-optical probe is made self-checking by providing the same with means for intercepting a portion of the usual light beam and constantly reflecting such portion to the usual receiving electro-optical transducer to constantly generate a low level electrical signal even when the probe is wet. Means are provided for boosting the signal to activate an alarm, failure of which will be indicative of failure or malfunctioning of one or more elements of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.