Patent ID: 6825040
Filing Date: 2004-11-30
Classification: G01N,Y10T

Abstract:
Method of using a sheet like pH-type indicator paper substrate in a test kit to react with inorganic acids in vapor compressor systems, comprising impregnating the paper substrate with a pH indicator selected from the group consisting of&sgr;-Cresolsultonephthalein m-Cresolsultonephthalein Thymolsulfonephthalein Diphenylamino-p-benzene sodium sulfonate 2,6-Dinitrophenol 2,4,-Dinitrophenol Dimethylamlnoazoben-zene Dimethylamlnoazoben-zene sodium sulfonate Tetrabromophenolsulfone-phthalein Tetrabromo-m-cresol-sulfonephthalein &sgr;Carboxybenzenoazo-dimethylanillne Dichlorophenolsulfone-phthalein Dibromo-o-cresolsulfone-phthalein Dibromophernolsulfone-phthalein p-Nitrophenol Olbromothymolsulfone-phthalein Aminodimathylaminotolu-phenazonium chloride Phenolsulfonephthalein m-Nitrophenoi &sgr;-Cresolsulfonephthalein m-Cresolsulfonephthalein Thymolsulfonephthalein Phenolphthalein &sgr;Naphtholbenzein Thymolphthalein &dgr;-(p-Nitrophenylazo)-salicylic acid Na salt p-Sulfobenzeneazo-resorcinol 2,4,5-Trinitrophanyl-methylnitroamine and removably holding the sheet-like paper substrate in a hollow transparent member such that the held substrate is viewable therethrough, and open at upstream and downstream ends thereof so as to define a free cross-section disposed along a flow of vapor in the vapor compressor system through the member when the upstream end thereof is temporarily held against a service valve of a system for flowing the vapor over an outer surface of the sheet-like paper substrate into the atmosphere.