Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1977-08-22
1979-04-17
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
340628, 340634, G08B 1710, G08B 2600
Patent
active
041503708
ABSTRACT:
A detector for smoke and/or selected gases includes a sensor means to which the smoke or gas is applied. The sensor is connected at one terminal to ground, the other terminal going through a current meter, through a control potentiometer to a selected positive DC voltage. A potential detector is connected at a selected point in the potentiometer so as to determine when a selected magnitude of current is flowing through the sensor. The output of the detector goes through an alarm control means, and an alarm, which is sounded whenever the current through the sensor is greater than a selected minimum value. The system also includes a scanning detector system where a plurality of separate sensors are used, each in a separate location. A control system rapidly switches a detector from one sensor to another, measuring the current through each sensor, and when this current is greater than the selected minimum, the scanning control stops for a selected short period such as five seconds, or so, and displays the meter, showing the current through the detector, and displays a number, corresponding to that of the sensor, that is connected to the detector at that particular moment.
REFERENCES:
patent: 2533339 (1950-12-01), Willenborg
patent: 3906473 (1975-09-01), Le Vine
patent: 3909816 (1975-09-01), Teeters
patent: 3983554 (1976-09-01), Goode
patent: 3997837 (1976-12-01), Betz et al.
Caldwell Sr. John W.
Myer Daniel
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