Chemistry: physical processes – Physical processes – Crystallization
Patent
1974-11-07
1976-03-23
Reese, Robert M.
Chemistry: physical processes
Physical processes
Crystallization
356 37, 250574, G01N 122, G01N 2126
Patent
active
039458016
ABSTRACT:
A continuous HCl in-air indicator consists of a tube-like element with an inlet end through which a continuous stream of air, containing HCl, enters. The air flows downstream from the inlet end and exits the element's outlet end. Positioned between the element's inlet and outlet ends are first and second spaced apart photoelectric units, which are preferably positioned adjacent the inlet and outlet ends, respectively. Ammonia gas is injected into the air, flowing through the element, at a position between the two photoelectric units. The ammonia gas reacts with the HCl in the air to form ammonium chloride particles. The difference between the outputs of the two photoelectric units is an indication of the amount of HCl in the air stream.
REFERENCES:
patent: 2431899 (1947-12-01), Wolf et al.
patent: 2684008 (1954-07-01), Vonnegut
patent: 3094392 (1963-06-01), Skala
patent: 3578410 (1971-05-01), Van Luik, Jr.
Bartera Ralph E.
Fletcher James C. Administrator of the National Aeronautics and Space
Miller Charles G.
Grifka Wilfred
Manning John R.
Mott Monte F.
Reese Robert M.
The United States of America as represented by the United States
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