Patent ID: 9052282
Filing Date: 2015-06-09
Classification: G01N

Abstract:
1. A water analysis measurement arrangement for determining a concentration of at least one of ions and ionic compounds in an aqueous medium, the water analysis measurement arrangement comprising: a closed buffer solution housing comprising a pH buffer solution, the closed buffer solution housing being configured to communicate with the aqueous medium via an electrolyte bridge; a reference electrode arranged directly in the closed buffer solution housing so as to have a direct electrical contact with the pH buffer solution; an amplifier ground; a ground electrode configured to directly contact the aqueous medium; a high-impedance amplifier comprising a first capacitive element arranged between the reference electrode and the amplifier ground to which the first capacitive element is directly connected; an AC voltage generator arranged between the amplifier ground and the ground electrode, the AC voltage generator being configured to output a low-frequency alternating signal; a measurement electrode configured to directly contact the aqueous medium and being connected to an amplifier which is connected to the amplifier ground; and a redundant unit comprising a separate low-impedance redundant electrode arranged directly in the closed buffer solution housing so as to have a direct electrical contact with the pH buffer solution, the separate low-impedance redundant electrode being connected to a high-impedance redundant electrode amplifier comprising a second capacitive element being directly connected to the amplifier ground, wherein, the amplifier ground is electrically disposed on the ground electrode if the AC voltage generator does not output the low-frequency alternating signal, and the low frequency alternating signal is induced into the aqueous medium via the ground electrode so as to allow an impedance determination of the electrolyte bridge, if the AC voltage generator outputs the low-frequency alternating signal, and the electrolyte bridge comprises an electrolyte chamber and an electrolyte solution or an electrolyte gel, wherein the electrolyte chamber comprises a first diaphragm and a second diaphragm.