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| Research on the Immersion Profiles with Water Triple Point Cells and the Effect of Bushing on the Immersion Profiles |
| WANG Peng1,2,HU Zi-feng1,ZHU Jia-qi1,YAN Xiao-ke2,JIANG Hong1,PU Ling1,CHEN Gong1 |
1. Shanghai Institute of Quality Inspection and Technical Research, Shanghai 201114, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract Using labview programming and stepper motor controller, an automatic measuring system of immersion profiles was established. The system controlled the height of standard platinum resistance thermometer(SPRT) in thermometer well by the stepper motor controller, and measured the resistance value in different heights of SPRT by the AC bridge which accuracy is 0.02×10-6. By linear fitting, the hydrostatic pressure correction coefficient of water triple point cells was obtained. The effects of bushing on the immersion profiles were studied, and the experimental results show that the experimental value of the hydrostatic pressure correction coefficient of water triple point cells is very close to the theoretical value when the ininer diameters are 16 mm and 18 mm, the difference is less than 0.4 μK/cm. The effect of bushing on the hydrostatic pressure correction coefficient is less than 0.5 μK/cm.
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Received: 01 December 2015
Published: 27 September 2017
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2017, Vol. 38 
