Colorimetric testing and measuring device for gases
US5171536A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1991 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Dec 9, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/163333
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is directed to a testing and measuring device for colorimetrically detecting gases on a carrier which is impregnated with a solution of a moisture store and a detecting indicator. The testing and measuring device is improved in that the moisture on the indicator carrier needed for the detecting reaction is maintained over a longer time span during storage in the unused condition as well as during measurement under the action of the gaseous substance to be detected. For this purpose, the impregnating solution is composed of the detecting indicator and a mixture of sulfolane and diethylphthalate as a moisture store. For measuring hydride gases, the indicator comprises a palladium tetramine chloride. The impregnating solution is applied to a paper carrier or to a granular silica gel carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.