COULOMETRIC UNIT WITH CONTROLLED POTENTIAL Russian patent published in 2015 - IPC G01N27/42 

FIELD: electricity.

SUBSTANCE: coulometric unit with controlled potential comprises potentiostat, potential setter coupled to the first input of potentiostat, three-electrode electrolytic cell, operating electrode, which is coupled to the common wire of potentiostat, reference electrode is coupled to the second input of potentiostat and auxiliary electrode is coupled to output of potentiostat, resistor current-voltage converter coupled between output of potentiostat and auxiliary electrode of the cell, the first and second decoupling resistors, switches, voltage integrator, recording and control units; the coulometric unit comprises additionally operational amplifier, polarity reverser and double switch with the first and second groups of change-over contacts, at that input of polarity reverser through the first and second decoupling resistors is coupled to resistor current-voltage converter while its output is coupled to input and common wire of the operational amplifier, which output is coupled to input of voltage integrator, change-over contact of the first group of double switch is coupled to output of resistor current-voltage converter, normally open and normally close contacts in this group of double switch are coupled respectively to auxiliary electrode of the electrolytic cell and with common wire, change-over contact of the second group of double switch is coupled to the second input of potentiostat, normally open and normally close contacts in this group of switch are coupled respectively to reference electrode of the electrolytic cell and control inputs of potential setter, double switch, polarity reverser, operational amplifier, voltage integrator and recording unit are connected to the respective outputs of control unit.

EFFECT: improving accuracy and simplifying design of coulometric unit with controlled potential.

6 cl, 5 tbl, 1 dwg