Coupling adapter for a thermometer

A coupling adapter for a measuring insert for determining and/or monitoring a temperature of a medium, wherein the measuring insert comprises a temperature sensor and is configured to be introduced into a protective tube configured to accommodate the measuring insert, the coupling adapter comprising:

• a base body having a generally cylindrical shape and including an internal bore having a fixed bore diameter, which corresponds to an outer diameter of the measuring insert;
• and
• a coupling element configured so as to fix the measuring insert inside the protective tube in a state when the measuring insert is introduced into the protective tube, wherein the coupling element is arranged on an outer surface of the base body,
• wherein the coupling element is at least partially composed of a thermally conductive material and includes a spring element as a first at least partially elastically deformable element, and
• wherein the base body includes at least one section in which an outer diameter of the base body is reduced and the spring element is arranged.