Electronic control device

Details Electronic control device Electronic control device

1979-04-12

1982-06-15

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340528, G08B 1308

Patent

active

043353762

ABSTRACT:
A security device for protecting premises having three separate variable time delays. A first time delays allows a legitimate user of the device to enter the premises and de-activate the device before the alarm sounds. The second time delay permits a legitimate user to exit from the premises without sounding the alarm. The third time delay ensures that the alarm will sound for a minimum period once the loop has been opened by an intruder. The device has an integrated circuit and each of the time delays are achieved through the use of a resistor in combination with a capacitor. The device also has a supervisory loop and the alarm becomes activated when the loop has been opened.

REFERENCES:
patent: 3820102 (1974-06-01), Schubert
patent: 4122437 (1978-10-01), Petersen
patent: 4151520 (1979-04-01), Full

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