Fail safe circuit for a salinity monitor

Details Fail safe circuit for a salinity monitor Fail safe circuit for a salinity monitor

1985-12-23

1987-05-26

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

324 51, 340507, 340652, G08B 2100

Patent

active

046689443

ABSTRACT:
A fail safe circuit is provided in a salinity monitor having a salinity indicating panel for visually presenting salinity levels and a salinity cell for sensing salinity levels. The salinity cell is electrically connected to the salinity indicating panel by a plurality of salinity cell leads which supply electrical signals to the salinity indicating panel for indication of salinity levels. The fail safe circuit enables an alarm when a salinity cell lead becomes disconnected from the salinity indicating panel. Also, a back-up circuit is provided for enabling an alarm should the fail safe circuit become inoperative.

REFERENCES:
patent: 2684475 (1954-07-01), Lode
patent: 3521276 (1970-07-01), Raber
patent: 4181880 (1980-01-01), Teass, Jr.
patent: 4190827 (1980-02-01), Diamond

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