Combustible vapor detector

Details Combustible vapor detector Combustible vapor detector

1975-08-01

1976-06-08

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

23255E, 340237R, G01N 2716, G01N 3322, G08B 2100

Patent

active

039619001

ABSTRACT:
Apparatus for detecting the presence of combustible vapors, e.g., natural gas, in the air utilizes an aluminum heat sink having a sealed reference chamber and a sensing chamber through which samples of air are continuously drawn. Separate unsupported platinum filaments that change in resistive value as a function of combustible gas which comes in contact therewith are located within the two chambers. The bottom of the sensing chamber has an input passage and an output passage with a wire mesh screen covering both passages. A solid non-porous plate having an outer perimeter slightly smaller than the inner perimeter of the sensing chamber is located above the wire mesh screen. The electrical circuitry of the apparatus includes a filament burn-out detection circuit and an unbalanced wheatstone bridge that goes through balance to the reverse unbalanced condition only if a combustible vapor comes into contact with the sensing filament.

REFERENCES:
patent: 1459127 (1923-06-01), Williams et al.
patent: 2531592 (1950-11-01), Yant et al.
patent: 2533339 (1950-12-01), Willenborg
patent: 2821462 (1958-01-01), McEvoy
patent: 2916358 (1959-12-01), Valentine et al.
patent: 3087795 (1963-04-01), Ross
patent: 3421362 (1969-01-01), Schaeffer
patent: 3725005 (1973-04-01), Innes
patent: 3771960 (1973-11-01), Kim et al.

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