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Electro-chemical concentration transducer and its use to measure and control acid strength and storage battery charge

  • US 4,045,721 A
  • Filed: 12/30/1974
  • Issued: 08/30/1977
  • Est. Priority Date: 12/30/1974
  • Status: Expired due to Term
First Claim
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1. A transducer for sensing electrolyte concentration and producing an electric signal potential output proportional to a difference in concentration between a first electrolyte having a first concentration and a second similar electrolyte having a second concentration, comprising in combination;

  • a first electrode coupled to a first terminal and having a surface area in contact with said first electrolyte contained in a first container, anda second electrode coupled to a second terminal and having a surface area in contact with said second electrolyte contained in a second container, andan open joining container having a first end opening into said first container and a second end opening into said second container, andadapted by construction means to be filled with an electrolyte to form a joining electrolyte making electrolytic connection with said first electrolyte at said first end and also making electrolytic connection with said second electrolyte at said second end to thereby establish adirect electrolytic connection between said first and said second electrolytes so as to permit a measuring current considerably in excess of that conventionally associated with glass membrane half cell usage to flow through said joining electrolyte to said first and second electrolytes and said first and second electrodes to said first and second terminals,said open joining container also constructed in elongated form wherein the ratio of the length to the square root of the effective cross-section area is greater than 10 so as to generally prevent mixing by unintentional passage therethrough of said first and said second electrolytes so that neither said first nor said second concentration is altered by more than an allowable amount during the useful life of said transducer.

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