×

Apparatus for use in rapid and accurate controlled-potential coulometric analysis

  • US 4,244,800 A
  • Filed: 08/23/1979
  • Issued: 01/13/1981
  • Est. Priority Date: 08/23/1979
  • Status: Expired due to Term
First Claim
Patent Images

1. In an apparatus for controlled-potential coulometric analysis of an electroactive species in a solution, including a cell containing the solution, means for supplying a controlled atmosphere in the cell, means for stirring the solution in the cell, a working electrode disposed in the cell in electrical contact with the solution, a counter electrode disposed in the cell in electrical contact with the solution, a reference electrode disposed in the cell in electrical contact with the solution, a potentiostat connected to the working electrode, the counter electrode and the reference electrode for applying controlled electrical potential differences between the working electrode and the reference electrode and between the counter electrode and working electrode, an improved means for obtaining a digital electrical equivalent to electric current flow through the solution, the improvement comprising:

  • a first scaler connected to an output of the potentiostat and receiving an electrical signal from the potentiostat that is proportional to current through the working electrode;

    a first voltage-to-frequency converter connected to the first scaler and receiving as an input a scaled signal from the first scaler, and producing a digital readout signal;

    a first zero adjust connectable to a power supply and to the first voltage-to-frequency converter to provide a scaled zero input signal to the first voltage-to-frequency converter;

    a second voltage-to-frequency converter;

    a second zero adjust connectable to a power supply and connected to provide a zero input to the second voltage-to-frequency converter;

    a second scaler connectable to the readout signal and to electrical ground and connected to the second voltage-to-frequency converter to produce a digital zero-output signal;

    a clock producing an electrical signal at a fixed frequency; and

    a display card connected to the means for obtaining and displaying visually a count that is proportional to a current flow through the solution.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×