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| The Research on Construction the High Precision Au/Pt Thermocouple and its Stability of Thermoelectric Character |
| ZHENG Wei,TANG Lei,XIANG Ming-dong |
| National Institute of Metrology, Beijing 100029, China |
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Abstract The stability of thermo-electric character in long term application of Au/Pt thermocouple, which is fabricated by a pure golden wire and a platinum wire, is a key to high accurate performance to in temperature measurement.Firstly, the thermo-elements were cut, cleaned, annealed, welded. Then, the thermo-elements were assembled to the thermocouples and were tested. The stability of whole thermocouples was proved within ±0.02℃ at Ag freezing point calibration, after ageing time of thermocouples was summed up to about 700h at temperature up to 965℃.The thermocouple measurement junction was constructed in three different ways: traditional type, mini-coil type and U shape type, the experiment results showed that the short-term stability is better for mini-coil type compare to U shape type applied to thermocouple measurement junction connection.
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Received: 13 May 2021
Published: 23 February 2022
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2022, Vol. 43 
