Apparatus with temperature sensor for a mould of a continuous casting machine, wherein the mould comprises a copper plate and a water tank, having - a thermocouple for temperature measurement, having a tube and a projection; - a screw-in bolt that comprises - a first external thread at the lower end of the screw-in bolt for screwing the screw-in bolt into the copper plate, and - a through-hole, characterized in that the screw-in bolt is provided with a blind hole, wherein the blind hole is concentric with the through-hole and the blind hole is arranged on the lower end of the screw-in bolt, - a cylindrical lateral face, and - a second external thread, wherein the cylindrical lateral face is arranged between the first and second external threads, and at least the projection of the thermocouple is arranged inside the blind hole of the screw-in bolt; - a first seal which is arranged in the axial direction between the blind hole of the screw-in bolt and the projection of the thermocouple and in the radial direction between the tube of the thermocouple and the blind hole of the screw-in bolt, such that the thermocouple is sealed with respect to the screw-in bolt and the thermocouple is pressed against the copper plate; - a seal support having a second seal for sealing the seal support with respect to the water tank and a third seal for sealing the seal support with respect to the screw-in bolt; and - a union nut for bracing the seal support against the water tank by means of the second external thread. - a thermocouple for temperature measurement, having a tube and a projection; - a screw-in bolt that comprises - a first external thread at the lower end of the screw-in bolt for screwing the screw-in bolt into the copper plate, and - a through-hole, characterized in that the screw-in bolt is provided with a blind hole, wherein the blind hole is concentric with the through-hole and the blind hole is arranged on the lower end of the screw-in bolt, - a cylindrical lateral face, and - a second external thread, wherein the cylindrical lateral face is arranged between the first and second external threads, and at least the projection of the thermocouple is arranged inside the blind hole of the screw-in bolt; - a first external thread at the lower end of the screw-in bolt for screwing the screw-in bolt into the copper plate, and - a through-hole, characterized in that the screw-in bolt is provided with a blind hole, wherein the blind hole is concentric with the through-hole and the blind hole is arranged on the lower end of the screw-in bolt, - a cylindrical lateral face, and - a second external thread, wherein the cylindrical lateral face is arranged between the first and second external threads, and at least the projection of the thermocouple is arranged inside the blind hole of the screw-in bolt; - a first seal which is arranged in the axial direction between the blind hole of the screw-in bolt and the projection of the thermocouple and in the radial direction between the tube of the thermocouple and the blind hole of the screw-in bolt, such that the thermocouple is sealed with respect to the screw-in bolt and the thermocouple is pressed against the copper plate; - a seal support having a second seal for sealing the seal support with respect to the water tank and a third seal for sealing the seal support with respect to the screw-in bolt; and - a union nut for bracing the seal support against the water tank by means of the second external thread.