Title: Method of making a combination ion responsive and reference electrode

Abstract: A solid state pH measuring electrode having the pH measuring electrode structure formed by successive layers on an insulating substrate with an outer pH sensitive glass layer being deposited on a supporting solid electrolyte layer by RF sputtering. The reference electrode is similarly formed by depositing an outer layer of glass onto a supporting solid electrolyte layer by RF sputtering with the temperature expansion of the glass and supporting solid electrolyte structure being selected to produce a differential expansion causing random cracking of the glass layer during temperature cycling of the reference electrode. A combination structure is provided wherein the pH measuring electrode and the reference electrode are formed on opposite sides of the same electrically insulating substrate with a thermal compensating element being included in the integrated package.

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Other info:

Inventors: Szonntagh, Eugene L. (Flourtown, PA, US)

Application Number: 661958
Filing Date: 1976-02-27
Publication_date: 1977-06-28
Assignee: Honeywell Inc. (Minneapolis, MN)
Primary Class(es): 427/80 204/420, 204/435
Other Classes:
US Patent Ref:

2182376	Dec, 1939	Gray	29/570.
2604517	Jul, 1952	Brennan	29/570.
2917683	Dec, 1959	Brennan	29/570.
3282817	Nov, 1966	Riseman	204/195.
3498901	Mar, 1970	Metz	204/195.
3853731	Dec, 1974	Gray	204/195.

Other Refs:
Primary Examiner: Tupman, W.
Assistant Examiner:
Attorney: Marhoefer; Laurence J., Burton; Lockwood D., Halista; Mitchell J.