Stability of Tungsten-Rhenium Thermocouples in the Range from 0 °C to 1500 °C

被引：13

作者：

Ogura, H. ^{[1
]}

Izuchi, M. ^{[1
]}

Tamba, J. ^{[1
]}

机构：

[1] Natl Metrol Inst Japan NMIJ, Natl Inst Adv Ind Sci & Technol AIST, Temp & Humid Div, Tsukuba, Ibaraki, Japan

来源：

INTERNATIONAL JOURNAL OF THERMOPHYSICS | 2011年 / 32卷 / 11-12期

关键词：

Calibration; Drift; Inhomogeneity; Type C thermocouple; Tungsten-Rhenium; POINT;

D O I：

10.1007/s10765-011-1051-6

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The effect of exposure up to 1500 A degrees C on emf values of type C (95 % tungsten 5 % rhenium vs. 74 % tungsten 26 % rhenium) thermocouples were evaluated. Three thermocouples consisting of thermocouple wires of 0.5 mm diameter, twin-bore beryllia tubes, and tantalum sheaths were prepared. After three type C thermocouples were calibrated in the range from 0 A degrees C to 1550 A degrees C, which confirmed insignificant difference among them, the drifts of two among them were measured at the palladium-carbon (Pd-C) eutectic point (1492 A degrees C). They indicated a similar tendency, where the emf of thermocouples increased rapidly within the first 30 h, and after that, decreased gradually. To investigate the mechanism of the drift, the inhomogeneities of thermocouples were examined at 160 A degrees C using a water heat-pipe furnace during the drift measurements at the Pd-C eutectic point. It was found that the increase of emf within the first 30 h exposure at around 1500 A degrees C was caused by the emf change due to inhomogeneity above 700 A degrees C, and after that, the decrease of emf was caused by that around 1400 A degrees C.

引用

页码：2420 / 2435

页数：16

共 18 条

[1]

[Anonymous], 2003, E23003 ASTM INT

[2]

Bums G.W., 1972, Temperature: Its Measurements and control in Science and Industry, V4, P1751

[3]

Glawe G.E., 1972, TEMPERATURE ITS MEAS, V4, P1645

[4]

International Bureau of Weights and Measures, 1997, TECHN APPR INT TEMP, P37

[5]

Izuchi M., 2004, P TEMPMEKO 2004 9 IN, P471

[6]

Jahan F., 2007, METROLOGIA S, V44, P03004, DOI DOI 10.1088/0026-1394/44/1A/03004

[7]

Kim Y.G., 2006, P 18 IMEKO WORLD C R

[8]

Morice R, 2002, TEMPMEKO 2001: 8TH INTERNATIONAL SYMPOSIUM ON TEMPERATURE AND THERMAL MEASUREMENT IN INDUSTRY AND SCIENCE, VOL 1 & 2, PROCEEDINGS, P73

[9]

MORICE R, 2004, P TEMPMEKO 2004 9 IN, P847

[10]

MORICE R, 2005, P SICE 2005 OK JAP, P678

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