INSTRUMENT FOR SIMULTANEOUSLY MEASURING PHYSICAL PROPERTY AND ELECTROCHEMICAL PROPERTY OF FLUID

摘要

PURPOSE:To prevent overlooking in measurement by simultaneously measuring the physical properties and electrochemical properties of fluid by means of the instrument constituted of at least a piezoelectric element, flow cell, piezoelectric element characteristic measuring instrument, electrochemical measuring instrument, and recorder. CONSTITUTION:The measuring path is inserted with a capacitor between an electrode 6 of the piezoelectric element 1 and the piezoelectric element character istic measuring instrument 3 to prevent the flow of a DC current between the same and the electrochemical measuring instrument 4. A resonance frequency and resonance resistance are measured by the instrument 3. The instrument 4 has a potential setting circuit and current measuring circuit which set the potential of a working electrode at a prescribed potential with respect to a reference electrode 8 and measures the current flowing in the working electrode. The simultaneous measurement of the two indices in the physical properties and electrochemical properties of the fluid is enabled in such a manner and even the information which has heretofore been overlooked with one sensor is measurable.