Abstract: The present disclosure relates to a measuring insert for insertion into a protective tube for determining and/or monitoring a temperature of a medium in a vessel or pipe, which protective tube at least partially protrudes into an inner volume of the vessel or pipe, the measuring insert including: an elongated tube; a temperature sensor arranged inside an end region of the measuring insert; and a coupling element connected to the elongated tube in the end region in which the temperature sensor is arranged, which coupling element is embodied and/or dimensioned so as to serve for fixing the measuring insert inside the protective tube in a state in which the measuring insert is introduced into the protective tube.

Abstract: The present disclosure relates to a coupling adapter for a measuring insert for determining and/or monitoring a temperature of a medium including a temperature sensor, which measuring insert can be introduced into a protective tube for accommodating the measuring insert. The coupling adapter includes a base body, including a bore with a diameter adapted to an outer diameter of the measuring insert, and a coupling element, which is arranged on an outer surface of the base body, which coupling element is embodied and/or dimensioned so as to serve for fixing the measuring insert inside the protective tube in a state in which the measuring insert is introduced into the protective tube. The present disclosure further includes an apparatus for determining and/or monitoring the temperature of a medium comprising such coupling adapter.