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Single Rod Measuring Element for PH Compensated Redox Potential Measurement

IP.com Disclosure Number: IPCOM000086474D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Barthold, G: AUTHOR [+3]

Abstract

For pH compensated redox potential measurements of fluids, a glass electrode containing a reference fluid for measuring the pH value and a platinum or gold electrode for measuring the redox potential are generally introduced into the fluid to be measured. The potential required is determined with suitable measuring instruments.

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Single Rod Measuring Element for PH Compensated Redox Potential Measurement

For pH compensated redox potential measurements of fluids, a glass electrode containing a reference fluid for measuring the pH value and a platinum or gold electrode for measuring the redox potential are generally introduced into the fluid to be measured. The potential required is determined with suitable measuring instruments.

A single-rod measuring element is shown, whereby the pH compensated redox potential occurring on the combination of a glass and a platinum electrode is sensed by means of two field-effect transistors (FETs) integrated on a semiconductor chip. The platinum electrode which consists of an FET structure whose gate is made of platinum, comes into direct contact with the fluid to be measured.

The glass electrode consists of an FET structure in which the reference fluid replaces the gate metallization, so that it comes into direct contact with the gate isolation, being surrounded by electrode glass.

Semiconductor chip 1, containing the two FET structures, is sealed in the tip of a glass rod or a glass tube 2. The FET forming the glass electrode contains a source zone 3 and a drain zone 4 between which the channel zone extends. Gate isolation 5, which is immersed in reference fluid 6 and hermetically sealed by electrode glass 7, is arranged on top of the channel zone. The FET forming the platinum electrode contains a source zone 8 and shares drain zone 4 with the FET formi...