MEASURING DEVICE

摘要

A measuring device comprises a guard electrode that is arranged around a cathode, reduces oxygen that is not from an oxygen permeable membrane and inhibits the oxygen from reaching the cathode. The guard electrode is electrically connected to an anode through a resistor having a prescribed resistance.

主权项

1. A measuring device that comprises a casing having a permeable member that permeates an object substance in a measurement sample and a pair of electrodes, namely, a first electrode and a second electrode immersed in an electrolytic solution filled in the casing, and that measures the object substance in the measurement sample based on a value of an electric current that flows through the first electrode and the second electrode in case that the object substance in the measurement sample entering inside the casing through the permeable member is reduced or oxidized on the first electrode, further comprising
a guard electrode that is arranged around the first electrode that is connected to the second electrode or another electrode immersed in the electrolytic solution and that reduces or oxidizes the object substance contained in the electrolytic solution outside of the guard electrode so as to inhibit the object substance from reaching the first electrode, wherein the guard electrode is electrically connected to the second electrode or the another electrode through a resistor having a prescribed resistance.