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Redox Measuring Electrode

IP.com Disclosure Number: IPCOM000086473D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Barthold, G: AUTHOR [+3]

Abstract

In the case of redox potential measurements, electrometric measurements on aqueous solutions are carried out by a platinum or gold electrode immersed in the fluid to be measured.

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Redox Measuring Electrode

In the case of redox potential measurements, electrometric measurements on aqueous solutions are carried out by a platinum or gold electrode immersed in the fluid to be measured.

The gate of a redox measuring electrode, with direct sensing of the redox potential by a metal-oxide semiconductor field-effect transistor (MOSFET), is made of platinum or gold and is directly exposed to the fluid to be measured. The redox potential occurring on this gate can be measured via the source-drain path of the FET.

Semiconductor body 1 of the FET is sealed in the tip of a glass rod or glass tube 2 in such a manner that gate 3 is exposed. The gate is arranged, as usual, on gate isolation 4 extending across the channel zone of the FET.

Drain 5 and source 6 are provided with contacts 7 and 8. Lines 9 and 10, connected to the contacts, are led back within glass tube 2 and serve as measuring lines to which a suitable potential measuring apparatus (not shown) and the current supply are connected.

Upon immersion of the glass tube, the gate and fluid to be measured come into direct contact. The sensed potential controls the current flow between drain and source via the gate. This current flow serves as a measuring variable for the redox potential.

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