Measuring insert for sensing temperature

A measuring insert for introduction into a protective tube for determining and/or monitoring a temperature of a medium in a vessel or pipe, which protective tube is configured to at least partially protrude into an inner volume of the vessel or pipe, the measuring insert comprising:

• an elongated tube having a distal end region;
• a temperature sensor comprising a resistive element or a thermocouple and disposed within the distal end region of the elongated tube;
• connection lines adapted for electrically contacting the temperature sensor;
• and
• a coupling element connected to the elongated tube in the distal end region in which the temperature sensor is disposed, which coupling element is 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 includes a metallic spring element as a first at least partially elastic and/or elastically deformable element, wherein the spring element comprises:
• a plurality of outward curved bars;
• and
• at least one ring-shaped connection element to which the plurality of bars is connected;
• wherein the coupling element further includes a fastening means configured to fasten the coupling element to the elongated tube, the fastening means including a ring-shaped fastening element having a fixed inner diameter, which corresponds to an outer diameter of the elongated tube, and
• wherein the coupling element is at least partially composed of a thermally conductive material.