Title: Method of making a 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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Inventors: Szonntagh, Eugene L. (Flourtown, PA, US)

Application Number: 760542
Filing Date: 1977-01-19
Publication_date: 1978-02-14
Assignee: Honeywell Inc. (Minneapolis, MN)
Primary Class(es): 427/80 29/25.03, 204/192.22
Other Classes:
US Patent Ref:

2917683	Dec, 1959	Brennan	29/570.
3282817	Nov, 1966	Riseman	204/195.
3498901	Mar, 1970	Metz	204/195.
3591482	Jul, 1971	Neff	204/195.
3718569	Feb, 1973	Petersen	204/195.

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