Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1982-09-29
1985-10-22
Rowland, James L.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
340502, 340603, G01R 2722
Patent
active
045491410
ABSTRACT:
A salinity indicatory system useful to monitor variations in the salt content of water sources provides for the simultaneous monitoring of a plurality of test stations and the operation of automatic alarm and dumping means when salinity concentrations reach or exceed predetermined set points. The alarm and dump set points are capable of being set at different levels to provide for an indication of an approaching dump condition. The system includes temperature compensating networks having thermistors and associated resistor networks mounted inside the salinity cell to function both as temperature shaping resistors and electronic scaling resistors, thereby providing the system with multi-range capability. A summary fault alarm circuit allows all alarm conditions occurring with respect to any of a plurality of perimeters to be signaled through a single, summary fault relay. An automatic alarm update feature permits alarm conditions subsequent to the first alarm to be signaled at the system console and indicated as subsequent alarm conditions unacknowledged. The system provides an alarm acknowledge feature whereby an alarm condition actuates a bell and flashing light alarm and, when the operator acknowledges the alarm condition, the bell goes off and the alarm lamp goes from flashing on to steady on.
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patent: 3263224 (1966-07-01), Berman et al.
patent: 3965414 (1976-06-01), Teass, Jr.
patent: 4190827 (1980-02-01), Diamond
patent: 4383221 (1983-05-01), Morey et al.
Myer Daniel
Rowland James L.
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