Ion-selective electrode and electrochemical sensor

An electrochemical sensor for determining a measurand representing a concentration of an analyte in a measuring fluid, comprising:

• an ion-selective electrode serving as a measuring half-cell of a potentiometric sensor, wherein the ion-selective electrode includes:
• a probe body made of a first material;
• and a sensor element comprising a base body made of a second material different from the first material and an ion-selective layer arranged on the base body;
• the probe body being connected to the base body by way of a liquid-tight joint;
• and the joint being formed by a receptacle, serving as a first joining partner, and a joining section protruding into the receptacle, serving as a second joining partner;
• a reference half-cell;
• and
• a sensor circuit that is connected to the reference half-cell and the measuring half-cell in an electrically conducting manner.