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Ion concentration monitor

  • US 4,506,226 A
  • Filed: 05/19/1982
  • Issued: 03/19/1985
  • Est. Priority Date: 05/19/1982
  • Status: Expired due to Fees
First Claim
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1. An apparatus for simultaneously monitoring ion concentrations for a plurality of different ions in an aqueous solution, said apparatus comprising:

  • (a) at least three electrodes insertable into said solution, at least two of said electrodes being ion-selective for particular ions;

    (b) at least three electrical impedance bufers, each one of said electrodes being electrically connected to a corresponding one of said electrical impedance buffers, each electrical impedance buffer generating an electrical signal indicative of electrical potential on the electrode to which the corresponding impedance buffer is connected; and

    (c) a plurality of operational amplifiers disposed in full differential configuration, each differential operational amplifier being connected to receive inputs from a corresponding pair of said impedance buffers, each differential operational amplifier generating a signal indicative of electrical potential difference between a corresponding pair of said electrodes so that the electical potential difference between any pair of ion-selective electrodes can be monitored, all of said differential operational amplifiers generating said signals simultaneously.

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