Alarm monitoring device

Details Alarm monitoring device Alarm monitoring device

1984-11-13

1987-06-23

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340514, 340525, 340 52F, 340 52R, G08B 2300

Patent

active

046756540

ABSTRACT:
An alarm monitoring system which simultaneously provides a bright alarm light and audible alarm upon the occurrence of an abnormal condition in a function being monitored. The alarm light is reduced to a dim illumination upon acknowledging of the alarm condition by the operator and the audible alarm is also deactivated. The dimmed alarm indication reduces detrimental effect of night vision while maintaining notice of an abnormal condition. Upon acknowledging the alarm condition, an electro-mechanical relay having two normally closed contacts and one normally opened contact is energized to redirect current flow to the alarm indicator lamp through a resistor and cause the dimmed illumination of the indicator lamp. A plurality of alarm indicator circuits are connected in parallel and have diodes connected in the circuitry to prevent electrical feedback in the system from causing false alarm indications in the corresponding alarm circuits. A test switch is provided which allows trouble shooting of the apparatus while the system is in normal use or out of use.

REFERENCES:
patent: 2934752 (1960-04-01), Arrasmith
patent: 3381286 (1968-04-01), Walsh
patent: 3456251 (1969-07-01), Smith et al.
patent: 3480939 (1969-11-01), Dees
patent: 3512147 (1970-05-01), Martin

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