Patent ID: 9279781
Filing Date: 2016-03-08
CPC Classification: G01N

Claim Text:
1. A measuring arrangement for registering a measured variable representing concentration of an analyte in a measured medium, comprising: a first electrode modified with a redox active substance; a second electrode; and a measuring circuit, which comprises a voltage source for applying at least one predetermined voltage between said first electrode and a reference electrode, as well as an apparatus for registering electrical current flowing, in such case, between said first electrode and said second electrode or for registering a variable correlated with the electrical current flowing between said first electrode and said second electrode, wherein: said second electrode is modified with the same redox active substance as said first electrode, said measuring circuit comprises a potentiostatic control circuit, which is embodied to perform measurements by means of a three electrode arrangement formed by said first electrode, said second electrode and said reference electrode, said measuring circuit is embodied in a first operating mode to connect said first electrode as a working electrode and said second electrode as a counter electrode and in a second operating mode to connect said first electrode as counter electrode and said second electrode as a working electrode of said three electrode arrangement.