Level sensor and alarm
US4987409A · kind A · utility
18Cited by
6References
12Claims
0Family size
Inventor
Key dates
| Filing date | Apr 24, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Apr 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An alarm system is disclosed for use with a water softener including a salt-brine tank containing a bed of salt. The alarm system includes a sensor situated in the salt-brine tank on the top of the bed of salt, an electronic circuit including an alarm, and an input for connecting the circuit to the sensor. The sensor is responsive to direct contact with the brine for operating the circuit to initiate the alarm in the event the top of the bed of salt drops below a preselected level or the brine rises above another preselected level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.