Browse Prior Art Database

Chloride Measuring System

IP.com Disclosure Number: IPCOM000091018D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Neff, GW: AUTHOR [+3]

Abstract

A silver-silver chloride electrode exhibits rapid aging so that various corrosive effects, manifested by a blackening of the electrode, tend to render the electrode inaccurate for measuring purposes. Systems for automatically cleaning and replating, in situ, the silver-silver chloride measuring electrode overcome the problem of frequent replacement. Where in such systems cleaning and plating is made against a silver counter-electrode, both electrodes tend to accumulate a silver chloride layer. This accumulation increases the impedance of the measuring electrode, thus affecting reproducibility, etc., in a process that is self-limiting.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 58% of the total text.

Page 1 of 2

Chloride Measuring System

A silver-silver chloride electrode exhibits rapid aging so that various corrosive effects, manifested by a blackening of the electrode, tend to render the electrode inaccurate for measuring purposes. Systems for automatically cleaning and replating, in situ, the silver-silver chloride measuring electrode overcome the problem of frequent replacement. Where in such systems cleaning and plating is made against a silver counter-electrode, both electrodes tend to accumulate a silver chloride layer. This accumulation increases the impedance of the measuring electrode, thus affecting reproducibility, etc., in a process that is self-limiting.

An automatic in situ cleaning and plating measuring system which avoids the accumulation problem is shown. Device 3 has measurement apparatus and the control circuitry for cleaning and plating. In the flow-through electrode arrangement 1, a noble metal electrode, such as platinum plate electrode 2, is used as counter-electrode during the cleaning and plating interval. Plating is effected by constant current source 11.

Electrode 2 and silver-silver chloride plate electrode 4 are each embedded in epoxy resin block 5. A channel is cut through block 5 and the two plate electrodes so that the sample fluid under test can pass through it and make contact with the respective electrodes via the sensing surfaces 6 and 7. Such surfaces are the walls of the holes in plates 2 and 4 respectively.

During the cleaning and...