Method of analyzing residual chlorine
US4129479A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1975 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Jan 30, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/182
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A continuous analyzer for accurately measuring the free chlorine residual in a chlorinated water supply having an ammonia content which gives rise to a combined chlorine residual whose bactericidal effectiveness is poor as compared to free chlorine. The analyzer includes an amperometric cell through which a sample from the supply is conducted, the cell being provided with a measuring electrode and a counter electrode. Connected in series with the electrodes is an external voltage source whose level is set to impress a potential on the measuring electrode at which the current flow in the cell as a result of the chlorine content of the sample increases progressively in accordance with the concentration of free chlorine residual, the cell being essentially insensitive to combined chlorine residual.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.