Free chlorine gas analyzer
US4581121A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1985 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | May 29, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/1886
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A free chlorine analyzer including a probe immersible in chlorinated water having oxygen dissolved therein, the analyzer being adapted to continuously and accurately measure the concentration of free chlorine in the water without regard to its oxygen content. The probe includes a noble metal measuring electrode, an oxidizable metal counter electrode and an electrolyte which in combination with the electrodes defines an electrochemical cell whose output current depends on the amount of the chlorine passing into the cell through a diffusion membrane permeable to this gas. The cell is connected through one or more serially-connected diodes operating in the forward direction to an output resistor across which is produced a voltage that depends on chlorine concentration. The voltage drop across the diodes impresses a potential on the cell which causes it to operate in a current limiting range and renders it insensitive to the oxygen content of the chlorinated water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.