Bill,
Good question! The key is to insulate the "back side" of the thermocouple or thermistor, so the dominant temperature reading is from the line you are trying to get the temperature reading from. Just a bit of foam or other insulating material will work.
Always measure at exactly the samer spot and make sure that there is physical contact of the temperature reading transducer (thermocouple or thermistor) to the actual pipe.
Does this help?
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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