Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1978-03-07
1980-01-01
Scovronek, Joseph
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
422 91, G01N 2130
Patent
active
041816994
ABSTRACT:
An apparatus for detecting the presence of a specific substance in a gas stream is disclosed. The apparatus comprises a sensing chamber adapted to receive a test paper which is subject to coloration when contacted by a specific substance in a gas contained in the sensing chamber, means for generating a light beam and directing it toward the test paper in the sensing chamber, a light beam sensing device responsive to the extent to which the test paper in the sensing chamber undergoes coloration in response to exposure to the specific substance in the gas stream, an amplifier connected to the light beam sensing device for providing an output voltage which is proportional to the coloration of the test paper, and means connected to the amplifier for providing an output signal which is an instantaneous indication of the concentration of the substance to be monitored, comprising a signal conditioning circuit connected to the amplifier for providing an output which is a linear function of the cumulative amount of the substance to be detected contacting the test paper, and a differentiator responsive to the output of said amplifier for deriving the instantaneous concentration of the substance in the gas stream. The apparatus is further provided with a beam splitter for dividing the light beam into two separate beams, one directed toward the test paper in the sensing chamber and the other toward a variable optical density filter, and a second light beam sensing device responsive to the transmittance of the variable optical density filter. The amplifier is responsive to the two light beam sensing devices for providing an output which is a function of the ratio of the light sensed by the two light sensing devices irrespective of the light source intensity variations. An automatic zero adjustment device is also provided for resetting the output of the amplifier to zero prior to taking measurements.
REFERENCES:
patent: 2762568 (1956-09-01), Sullivan
patent: 2812243 (1957-11-01), Goody
patent: 4023930 (1977-05-01), Blunck et al.
patent: 4032297 (1977-06-01), Lyshkow
patent: 4073621 (1978-02-01), Bull et al.
Noranda Mines Limited
Scovronek Joseph
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