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Miniature probe having multifunctional electrodes for sensing ions and gases

  • US 3,957,613 A
  • Filed: 11/01/1974
  • Issued: 05/18/1976
  • Est. Priority Date: 11/01/1974
  • Status: Expired due to Term
First Claim
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1. A unitary multifunctional probe for simultaneously determining the quantities of selected ion and gas constituents in a sample, comprising:

  • a. first electrode means including an elongated member having an electrochemically active first electrode portion for producing a potential in response to and representative of the amount of one of said constituents in said sample when said electrochemically active first electrode portion is in electrochemical communication with said sample,b. second electrode means having an electrochemically active second electrode portion for producing a second potential in response to and representative of the amount of another of said constituents in said sample, which is different than said one constituent, when said second electrode portion is in electrochemical communication with said sample, said second electrode means being supported from said elongated member, andc. insulating means interposed between said first and second electrode means for isolating said first and second electrode means from each other,d. at least one of said electrode means including a reference electrode having an electrochemically active portion in insulating spaced relationship relative to an aforesaid electrochemically active portion, said reference electrode being supported insulatingly from said elongated member and cooperating with at least one of said electrochemically active portion to produce a potential which is representative of a constituent,e. an electrolyte in mutual contact with said reference electrode active portion and with said active portion of said at least one electrode means, andf. a diffusion barrier enclosing said electrolyte,g. said second electrode means including a second reference electrode having an electrochemically active portion in insulating spaced relationship relative to its cooperating one of said electrochemically active portions, said second reference electrode being supported insulatingly from said elongated member,h. an electrolyte in mutual contact with said active portion of said second reference electrode and the active portion of its cooperating electrode.

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