Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-11-09
1995-07-18
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340693, 210 85, 210 962, G08B 2100
Patent
active
054345618
ABSTRACT:
An audio-visual alarm apparatus is provided for use with a water quality monitor having a pair of monitor nodes across which electrical conditions are indicative of whether the measured water quality is inside or outside of an acceptable quality range. The apparatus includes an audio-visual alarm and a circuit for energizing the alarm when the electrical condition across the monitor nodes is indicative of a measured water quality falling outside the acceptable range. The circuit includes a first relay for maintaining the circuit in a normally open position, and for closing the circuit when the relay is connected to the monitor nodes and a voltage condition across the monitor nodes is indicative of a measured water quality outside the acceptable range. Further, for certain monitors, it is possible to bypass the first relay by connecting the circuit directly to the monitor nodes. A second relay is provided in the circuit for normally preventing the energization of the alarm, and for providing energization to the alarm when the voltage condition across the monitor nodes is indicative of a measured water quality outside the acceptable range.
REFERENCES:
patent: 4708791 (1987-11-01), Dillard, III
patent: 4806912 (1989-02-01), Clack
patent: 4851818 (1989-07-01), Brown et al.
patent: 5057212 (1991-10-01), Burrows
patent: 5145575 (1992-09-01), Burrows
Greening J. M.
Prater Robert F.
Lefkowitz Edward
Master Hydrosystems, Inc.
Peng John K.
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