Colorimetric analyzer
US3975160A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1974 |
| Grant date | Aug 17, 1976 |
| Priority date | — |
| Expiry date | Jul 29, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/253
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A colorimetric analyzer automatically and continuously measures the transmission of light through a sample which has been mixed with reagents. Precise volumes of the sample are repeatedly measured by a siphon tube. Volumes of the reagent are added to the sample at different times in a measuring cycle. The reagent is added at different places in the analyzer so that it is possible for two different time-consuming reactions to proceed simultaneously. The mixed reagent and sample is supplied to a measuring cell which includes a source of light and a photocell. The distance between the source of light and the photocell are adjustable to accommodate analyses of mixtures with widely varying light transmission while providing a full scale output indication. The output of a photocell is applied to a sample and hold circuit during time intervals when the reactions of the reagents with the sample have been completed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.