Process and apparatus for monitoring ambient carbon monoxide

Details Process and apparatus for monitoring ambient carbon monoxide Process and apparatus for monitoring ambient carbon monoxide

1984-03-23

1986-10-14

Turk, Arnold

Chemistry: analytical and immunological testing

Rate of reaction determination

356402, 356445, 364525, 364579, 422 66, 422 87, 436 44, 436134, 436169, G01N 2178, G01N 3122

Patent

active

046172777

ABSTRACT:
A system for monitoring ambient carbon monoxide. Light from a source (14) is directed against a measuring element (10) which darkens in color as it absorbs carbon monoxide. The light reflected from the element is received by a photocell (16) which generates an electrical signal proportional to the intensity of the reflected light received thereby. The signal is sampled periodically, and stored in a microprocessor (24) which computes the rate of change of the signals. The periodic measurement of the intensity of the light can be varied in response to the rate of change of the light intensity measurement. When the rate of change reaches a level indicative of an unsafe level of ambient carbon monoxide, an alarm (34) is energized. Light from the source is simultaneously directed against a reference element (12) with the light reflected therefrom being received by a photocell (18) which generates an electrical signal proportional to the intensity of the light received thereby. A comparator (30) compares the electrical signal generated by the photocells and energizes an indicator (32) when the comparison indicates that the measuring element has absorbed sufficient carbon monoxide to require that the element be replaced.

REFERENCES:
patent: 2111301 (1938-03-01), Schroter
patent: 2153568 (1939-04-01), Johnson
patent: 2812243 (1957-11-01), Goody
patent: 4023930 (1977-05-01), Blunck et al.
patent: 4050895 (1977-09-01), Hardy et al.
patent: 4115067 (1978-09-01), Lyshlow
patent: 4181699 (1980-01-01), Kitzinger
patent: 4203156 (1980-05-01), Ishikawa

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