Process seal with integrated thermal nodes (4.1 to 4.5) for determining temperature and self-diagnosis for connections of pipeline elements which have thermoelectric structures in one plane which are formed in a multiply unsymmetrically circular or part-circular manner and consist of a first thermal material (a) in an outer disc region of the sealing ring and a second thermal material (b) in an inner disc region of the sealing ring , wherein the thermoelectric structures form at least three thermopairs (T1...T5) with known temperature-voltage dependence, wherein - the first thermal material (a) and the second thermal material (b) form multiple thermal nodes , which are arranged in the circumferential direction of the sealing ring , wherein - electrical connection lines are led from the thermal nodes to a connection component (S) at the outer edge of the sealing ring and from the latter to the outside and are electrically connected in parallel, series and/or differential connections, and produce combined thermoelectric voltage signals there, which are used for temperature measurement and/or error correction and/or self-diagnosis, characterized in that , from the outer disc region , connections of the thermal nodes (4.1, 4.2, 4.3), which are distributed in almost equal spacing from one another on a first half of the circumference of the inner disc region , are led to a connection point (A) in the connection component (S), the inner disc region with the thermal material (b) is connected as a common thermoelectric conductor to a connection point (B) in the connection component (S), from a further thermal node (4.4) a piece of conductor of the first thermal material (a) is led to a connection point (C) in the connection component (S) and, in a second half of the circumference of the inner disc region , a part of the outer disc region with a thermal node (4.5) opposite the further thermal node (4.4) is connected to a connection point (D) in the connection component (S). - the first thermal material (a) and the second thermal material (b) form multiple thermal nodes , which are arranged in the circumferential direction of the sealing ring , wherein - electrical connection lines are led from the thermal nodes to a connection component (S) at the outer edge of the sealing ring and from the latter to the outside and are electrically connected in parallel, series and/or differential connections, and produce combined thermoelectric voltage signals there, which are used for temperature measurement and/or error correction and/or self-diagnosis, characterized in that , from the outer disc region , connections of the thermal nodes (4.1, 4.2, 4.3), which are distributed in almost equal spacing from one another on a first half of the circumference of the inner disc region , are led to a connection point (A) in the connection component (S), the inner disc region with the thermal material (b) is connected as a common thermoelectric conductor to a connection point (B) in the connection component (S), from a further thermal node (4.4) a piece of conductor of the first thermal material (a) is led to a connection point (C) in the connection component (S) and, in a second half of the circumference of the inner disc region , a part of the outer disc region with a thermal node (4.5) opposite the further thermal node (4.4) is connected to a connection point (D) in the connection component (S). <EOS>