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Thermocouple Tutorial — 5 Comments

  1. Hello! Your post (MeasurementBlog » Thermocouple Tutorial) does so well that I would like to translate it into French, publish on my french blog and link to you. You have something against it? Regards

  2. Thermocouples measure the temperature difference between two points, not absolute temperature. To measure a single temperature one of the junctions—normally the cold junction—is maintained at a known reference temperature, and the other junction is at the temperature to be sensed.

    • Thanks, But…you’ve got the function correct, but the actual theory incorrect.

      Thermocouples produce a net voltage per unit length (The Seebeck voltage) that is proportional to the temperature gradient across that length. The use of a cold reference junction is the practical artifact or result of standardizing the reference conditions for thermocouples. Since the reference calibration tables do not specify a device’s length, one must realize that the net temperature gradient per unit length must sum up, or total to the temperatures referred to that at the hottest, wherever it is along the length.

      Thermocouples do not measure at a point!. The hot point may be anywhere along its length, not necessarily at the warmer junction.

  3. A very elaborated and complete video you showed here.It just shows how a thermocouple produce a volt per unit length that is proportional to the temperature.

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