Self-calibrating thermocouples for accurate high temperature measurement Summary NPL's temperature scientists have developed a self-validating thermocouple technology, which incorporates 'fixed- points' (materials which melt at well defined temperatures) made of metal- carbon eutectic alloys. This means that the thermocouple is able to self-validate, or check, that it is measuring the temperature correctly, by adjusting its calibration in response to the melting of the fixed point alloy. This is great news for industrial thermocouple users that rely on these thermocouples for process control. Background Current high temperature (above 1100 °C) thermocouples become less and less reliable as the temperature increases – in extreme cases, at very high temperatures (>1750 °C) they can be measur

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