Method of manufacturing an electrode for measuring pH
First Claim
1. A method of producing pH measuring electrodes, comprising the steps of:
- covering the surface of an electrically conductive support body with a thin insulation film;
removing a portion of said insulation film; and
forming a pH sensitive film at least on the portion of the conductive support body where the insulation film was removed, said pH sensitive film comprising iridium oxide, the ratio of iridium to oxygen in said iridium oxide being from 1;
2.5 to 1;
3.5.
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Abstract
This invention relates to a pH measuring electrode having a sensor film which is sensitive to a hydrogen ion (H+) in the solution. The pH measuring electrode of this invention has a sensor film of a metal oxide deposited on an electrically insulative ceramics substrate so that the sensor film can be very miniaturized in its size. Therefore, the entire pH measuring electrode can be made considerably small and simple in construction. Also, this invention provides another pH measuring electrode which further includes a porous film of an insulation material coated on the surface of the metal oxide sensor film so that the sensor film is not affected by any coexistent substances.
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Citations
9 Claims
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1. A method of producing pH measuring electrodes, comprising the steps of:
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covering the surface of an electrically conductive support body with a thin insulation film; removing a portion of said insulation film; and
forming a pH sensitive film at least on the portion of the conductive support body where the insulation film was removed, said pH sensitive film comprising iridium oxide, the ratio of iridium to oxygen in said iridium oxide being from 1;
2.5 to 1;
3.5. - View Dependent Claims (2, 3, 4)
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5. A method of producing pH measuring electrodes, comprising the steps of:
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forming a pH sensitive film on a portion of an electrically conductive support body, said pH sensitive film comprising iridium oxide, the ratio of iridium to oxygen in said iridium oxide being from 1;
2.5 to 1;
3.5; andthereafter covering the remaining portion of said support body with an insulation film. - View Dependent Claims (6)
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7. A method of producing pH measuring electrodes, comprising the step of:
forming a pH sensitive film on a surface of an electrically insulative ceramics substrate, said pH sensitive film comprising iridium oxide, the ratio of iridium to oxygen in said iridium oxide being from 1;
2.5 to 1;
3.5.- View Dependent Claims (8, 9)
Specification