Method for detecting vapor and liquid reactants
AssigneeSouthwest Research Institute
InventorsWilliam A. Mallow, Jerome J. Dziuk, Jr.
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Abstract
A paint or coating composition and method for detecting vapor or liquid reactants, such as ammonia. The composition is composed of ethyl cellulose as a binder, a filler, such as amorphous silica, and a dye, such as bromophenol blue. The composition serves as a passive detector for vapor or liquid reactants when applied to selected surfaces as a paint. The composition is capable of detecting extremely low concentrations of vapor. Further, the composition is capable of regenerating to its original color, thereby providing repeated detection capability.
Claims3
A method for detecting leakage from an enclosure, comprising the steps of:
- (a) introducing a predetermined gas to said enclosure, said gas comprising nitrogen containing compounds of the class comprising amines and ammonia;
- (b) providing a composition capable of a detectable colorimetric change to an object adjacent to said enclosure, said composition consisting essentially of ethyl cellulose, at least 3.0% by weight amorphous silica, solvent and an indicator;
- and
- (c) sensing any color change of said composition which indicates the presence of said predetermined gas and leakage from said enclosure.
A method for detecting leakage from an enclosure, comprising the steps of:
- (a) introducing a predetermined gas to said enclosure, said gas comprising nitrogen containing compounds of the class comprising amines and ammonia;
- (b) providing a composition capable of a detectable colorimetric change to an object adjacent to said enclosure, said composition consisting essentially of ethyl cellulose, at least 3.0% by weight amorphous silica, solvent and an indicator;
- and
- (c) measuring the degree of color change of said composition which indicates the presence of said predetermined gas and leakage from said enclosure.
Dependencies are inferred from the claim text.