Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1984-08-14
1986-11-25
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340512, 340513, 340540, G08B 2900
Patent
active
046251987
ABSTRACT:
A diagnostic status indicating apparatus is used with an alarm system having a plurality of normally-closed switch contacts which are opened upon occurrence of an alarm condition. Light-emitting diodes are connected across the normally-closed switch contacts at an opposite polarity to that of the current normally passing through the contacts in the operating mode. In order to diagnose the alarm-generating condition of the electrical contacts, a switch removes the operating voltage and connects a test voltage at a reverse polarity, whereupon the LED for any open circuited electrical contact is activated. The device is preferably based upon a double-pole-double-throw switch and includes indicators for a test condition and for a ground fault.
REFERENCES:
patent: 3309685 (1967-03-01), Manning
patent: 3351934 (1967-11-01), Vietz
patent: 3611362 (1971-10-01), Scott
patent: 3668676 (1972-06-01), Sasaki
patent: 3815112 (1974-06-01), Kleber
patent: 3924256 (1975-12-01), Cohen
patent: 3955183 (1976-05-01), McBrian
patent: 4270121 (1981-05-01), Verr
patent: 4274087 (1981-06-01), Swanson et al.
patent: 4394647 (1983-07-01), Van Dine
patent: 4435700 (1984-03-01), Alley
Williamson Gary L.
Williamson Oscar A.
Crosland Donnie L.
Self Diagnostic Security Devices, Inc.
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