Electrochemical sensor arrangement and a method for measuring a property of a fluid

An electrochemical sensor arrangement for measuring a property of a fluid, said electrochemical sensor arrangement comprising:

• a first electrode and a second electrode arranged on a first surface of a first layer, wherein the first electrode and the second electrode are configured to make contact with the fluid for measuring the property of the fluid;
• and
• readout circuitry connected to the first electrode and the second electrode for reading out signals from the first and second electrodes, wherein the readout circuitry is formed at a second surface of the first layer opposite to the first surface or at a substrate separate from the first layer;
• wherein the first electrode has a first shape on the first surface and the second electrode has a second shape on the first surface, wherein the second shape of the second electrode defines an opening within the second electrode such that the second shape of the second electrode completely encloses the first shape of the first electrode with a spacing being defined between the first electrode and the second electrode;
• and
• wherein a first connection between the first electrode and the readout circuitry comprises a first via extending from the first shape of the first electrode through the first layer.