PH-METER WITH CONSTANT CURRENT APPLIED BETWEEN THE TRANSITION METAL-BASED SENSOR ELECTRODE AND THE REFERENCE ELECTRODE

摘要

Apparatus, suitable for use as an electrochemical sensing device, comprising: a) a transition metal-based sensor electrode adapted to provide an equilibrium potential; b) an inert reference electrode adapted to provide a baseline voltage or current, which sensor and reference electrode are physically separated; and c) baseline means adapted to impose a baseline potential between the sensor and reference electrodes, whereby the baseline voltage or current may be set, is disclosed. Also disclosed is the use of the apparatus as a pH meter.