Security alarm process and apparatus

Details Security alarm process and apparatus Security alarm process and apparatus

1987-04-01

1989-08-01

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340611, 340626, G08B 1320, G08B 2100

Patent

active

048536903

ABSTRACT:
Monitoring a room is accomplished by measurement of air pressure where air passage resistance between a secured room and an outside atmosphere is measured and an alarm actuated, if the air passage resistance drops below a predetermined value. Evaluation of typical air pressure fluctuations in a frequency range between 0.01 Hz and 10 Hz is advantageous. The air pressure resistance may be determined by difference measurements of air pressure fluctuations in the outside atmosphere and the secured room, or as a singular process wherein a connecting tube is provided between the room to be secured and the outside atmosphere, where air movements varying as a function of air pressure fluctuations are measured. Devices for the carrying out of the process are described. The devices and the process provide a simple and cost effective alarm system that operates reliably and is secure against outwitting and sabotage.

REFERENCES:
patent: 3289192 (1966-11-01), Davey
patent: 3898640 (1975-08-01), Hossbach
patent: 3914755 (1975-10-01), Hook
patent: 3947838 (1976-03-01), La Forge, Jr.
patent: 3990063 (1976-11-01), Schuman
patent: 4386342 (1983-05-01), McKinley
patent: 4692743 (1987-09-01), Holden et al.

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