Electrode for measuring PH
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United States of America Patent
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-
Jan 2, 1996
Issued Date -
N/A
app pub date -
Jun 9, 1994
filing date -
Aug 22, 1990
priority date (Note) -
Expired
status (Latency Note)
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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.sup.+) 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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