Method and device for the determination of solvent vapours

Abstract

Abstract For the continuous and reversible registering of polar solvent vapours, use is made of a dye from the triphenylmethane-ortho-carboxylic acid group, in particular crystal violet ortho-carboxylic acid, which responds to the solvent to be detected by a colour reaction. The device proposed in connection with this has a test strip 5 which is exposed to the gas mixture to be tested, is provided with the said dye and consists of thin, optically transparent material. Also provided is an opto-electronic measuring arrangement which comprises a light source 6, a photodetector 7 and a processing unit and assigns a change in the transmitted or reflected light intensity or the fluorescent light when the bleaching of the test strip is changed to the desired solvent content. <IMAGE>

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