| 摘要 |
<p>The invention provides an electrochemical sensor of the type having a sensing electrode (12), a reference electrode (14) and a counter electrode (16) all in contact with an electrochemical medium, an amplifier (18) capable in operation of maintaining a first potential between the sensing electrode and the reference electrode, and means for detecting a current flowing at the sensing electrode or at the counter electrode in response to an electrochemical reaction at the sensing electrode due to the presence of a material of the type being monitored. According to the invention, there is an array of the sensing electrodes and a corresponding array of one of the reference electrodes and the counter electrodes, and means (30, 32) are provided for cycling an applied potential between the different electrodes in at least one of the arrays whereby each sensing electrode is in turn subjected to (a) a sensing potential at which detection can take place, and (b) a refreshing potential at which a discarge current flows between the associated counter electrode and sensing electrode to clean the surface of the sensing electrode.</p> |
