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Instrument for measuring electrical conductivity of a liquid

  • US 4,585,996 A
  • Filed: 05/27/1983
  • Issued: 04/29/1986
  • Est. Priority Date: 05/27/1983
  • Status: Expired due to Fees
First Claim
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1. An instrument for measuring electrical conductivity of a liquid, said instrument comprising:

  • (a) a first electrode and a second electrode, each of said first and second electrodes being immersible in said liquid;

    (b) means for impressing an input voltage signal having a triangular waveform on said first electrode, said triangular waveform having a substantially constant rate of voltage change through periodic changes in polarity of said input voltage signal, said input voltage signal integrating substantially to zero over each cycle of said triangular waveform, said input voltage signal having sufficient amplitude to drive an alternating electrical current through said liquid to said second electrode when said first and second electrodes are immersed in said liquid;

    (c) means for detecting said alternating electrical current at said second electrode, and for converting said current detected at said second electrode to an output voltage signal; and

    (d) means for processing said output voltage signal to obtain a signal indicative of electrical conductivity of said liquid.

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