Patent · US Expired

Circuit arrangement for an electro-chemical measuring device

US4318041A · kind A · utility

1Cited by
5References
6Claims
0Family size

Assignee

Inventor

Key dates

Filing dateAug 6, 1979
Grant dateMar 2, 1982
Priority date—
Expiry dateAug 6, 1999

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01N27/416
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A measuring circuit for use with an active polarized electrode, a reference electrode and a diaphragm which separates the solution to be examined from the electrolyte in which the electrodes are immersed. The output signals from the polarized electrode and from the reference electrode are processed as follows. The respective electrode is connected to one of the inputs of a respective operational amplifier (OA1, OA2) which serve as current voltage converters. The outputs of these amplifiers are then connected to a third operational amplifier (OA3) which detects the prevailing current difference in the electrode currents and initiates a necessary correction.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.