| Zugriffsnummer | 31697 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Multiple fixed-point cell |
| Autor(in); Institution |
Edler, Frank; 7.4, Temperatur, PTB-Berlin
Ederer, Petra; 7.4, Temperatur, PTB-Berlin
|
| Quelle/Jahr | International Journal of Thermophysics: 35 (2014), 6/7, 1180 - 1189 |
| ISSN | 0195-928X (PRINT) ; 1572-9567 (ONLINE) |
| DOI | |
| Verlag | Dordrecht: Springer |
| Konferenzangaben | TEMPMEKO 2013, Symposium on Temperature and Thermal Measurements in Industry and Science, Funchal, Madeira, 14-18 October 2013, Portugal |
| Zusammenfassung | The paper describes the construction and investigation of multiple fixed-point cells usable for the calibration of thermocouples at temperatures above 1100 °C. These fixed-point cells made of pure graphite are characterized by a simple construction as well as by a flexible application. The cylindrical basic mount is equipped with a central hole for the insertion of a thermocouple, and with eight drill holes contaning exchangeable cartridges which surround the central bore axially symmetrically. The cartridges are filled with with different metal-carbon (Me-C) eutectics: cobalt-carbon (Co-C), nickel-carbon (Ni-C), palladium-carbon (Pd-C), and rhodium-carbon (Rh-C). The melting temperatures of the different Me-C eutectics of the cartridges were compared to the melting temperatures of commonly used Me-C eutectic fixed-point cells of the Physikalisch-Technische Bundesanstalt by using a Pt/Pd thermocouple (Co-C, Ni-C) and Type B thermocouples (Pd-C,Rh-C). The uncertainties (k = 2) of the emfs measured at the inflection points of the melting curves are in the order of a few µ V which correspond to temperature equivalents between 0.3 K and 0.6 K. Furthermore, the difference between the melting temperatures of the Co–C and Ni–C cartridges was found to be 4.2 K by using simultaneously two sets of four cartridges filled with the two materials and placed alternately in the eight outer holes of one basic mount. |
