Timed dual comparator alarm

Details Timed dual comparator alarm Timed dual comparator alarm

1978-12-20

1982-06-15

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250381, 340661, 340529, G08B 1710

Patent

active

043353789

ABSTRACT:
A combustion detection apparatus and method is provided for generating an alarm output when either a first alarm condition or a second alarm condition is present. A first alarm output is generated when a first predetermined concentration of combustion products is continuously present in a region being monitored for a preestablished period of time. A second alarm output is immediately generated when a second predetermined concentration of combustion products is present in the region being monitored. The second predetermined concentration of combustion products represents a relatively greater concentration of combustion products than the first predetermined concentration.

REFERENCES:
patent: 3604983 (1971-09-01), Levin et al.
patent: 4163226 (1979-07-01), Ogawa

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