Circuit conduction test arrangement for emergency alarm systems

Details Circuit conduction test arrangement for emergency alarm systems Circuit conduction test arrangement for emergency alarm systems

1974-12-13

1976-08-31

Habecker, Thomas B.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340412, G08B 2900

Patent

active

039784762

ABSTRACT:
Circuit conduction test arrangement for emergency alarm systems having a receiving panel for a group of several sections to be supervised and including common alarm means, and a plurality of relay panels installed in the respective sections; comprising in each relay panel a sensor and an alarm device connected in parallel, said relay panels including a test switch, a reset switch and an impedance network; the receiving panel including means responsive to the variation of the input impedance, having first and second responsive devices connected in a particular manner so as to provide safe operation for the circuit conduction tests. In the test operation, the common alarm means does not operate, and only the alarm device of the relaying panel operates which has its text switch activated.

REFERENCES:
patent: 3094690 (1963-06-01), Voorhees
patent: 3351934 (1967-11-01), Vietz
patent: 3500394 (1970-03-01), Egesdal
patent: 3569964 (1971-03-01), Mande

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