Gudmund,

The location of the highest temp in the exhaust stream will probably vary for each engine. The only way to locate it is by trying different locations of the thermocouple or put multiple thermoucouples in the engine. The important reason for monitoring the temp is to note any changes in the temp at the same location which might indicate a problem somewhere in the engine. Myself I would like to see thermocouples at various locations in the engine, eg the turbine inlet, the compressor inlet and outlet, the combustion chambers and the ambient freestream total temp. I am just the type that would like more instrumentation for more info

Larry