Murat Kalemci, Sevilay Ugur
High accuracy measurement of temperature up to 1200°C is an important concept for science, technology and for the industry. For high temperature measurements, thermocouples, which depend on Seebeck principle, are widely used. Platinum based thermocouples are preferred due to their high purity and quality for metrological use. In this paper, the construction of type S and type R thermocouples at UME will be described. After construction, thermocouples were calibrated at the tin, zinc, aluminium and silver freezing points by fixed-point method and by wire-bridge method at gold point.
XVII IMEKO World Congress
· TC12
· 2003
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Marcelo dos Santos Monteiro, Alcir de Faro Orlando
The 1990 International Temperature Scale (ITS-90) substituted the platinum-platinum-10% rhodium thermocouple by the high temperature standard platinum resistance thermometer (HTSPRT) and the radiation thermometer, as an interpolating instrument in the 630°C to 1064°C range, due to the lower stability of the thermocouple. Although the uncertainty of reproducing the temperature scale became much lower, the cost of the required measuring equipments was raised. Aiming to offer the Brazilian Calibration Network accredited laboratories a lower cost temperature scale traceability alternative, at a...
XVII IMEKO World Congress
· TC12
· 2003
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Georges Bonnier, Eliane Renaot, DavorZvizdic, Lovorka G. Bermanec, Tomislav Veliki
The objective of this paper is to present the methodology for estimation of measurement uncertainties in comparison calibration of thermocouples used at Laboratory for Process Measurements (LPM). The methodology is applied for comparison calibration of rare-metal and industrial basemetal thermocouples within temperature range from –20°C to 660°C with LPM standard/working standard platinum resistance thermometers and from 600°C to 1050°C with LPM standard/working standard thermocouples.
XVII IMEKO World Congress
· TC12
· 2003
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Frank Bernhard, Dirk Boguhn, Silke Augustin, Helge Mammen, Andrej Donin
Using integrated miniature fixed-point cells, a measuring uncertainty of < 1 K can be reached under operating condi tions in the superheated steam range of power plants by a periodic recalibration of the thermocouples, with operating times of > 20000 h. The fixed-point materials used for a temperature range from 500°C to 650°C are technically pure metals and binary alloys.
XVII IMEKO World Congress
· TC12
· 2003
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Emese András
The OMH has developed a reference surface temperature apparatus for the calibration of contact surface temperature sensors under a variety of conditions. This article describes the dependence of temperature error on the inclination of a heated surface and studies the sources of these deviations for various surface temperatures and sensor types. The effect of surface inclination has not been investigated before but has been found significant, particularly because of its industrial relevance.
XVII IMEKO World Congress
· TC12
· 2003
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Rick Walker, Norman Willgress
Resistance bridges, when used for temperature measurements with SPRTs, are able to achieve uncertainties better than 1 ppm. However, they have several shortcomings that prohibit their use in many applications. Among these are cost, size, slow speed, and limited range. An endeavor was made by the author to design a readout for resistance thermometers that achieves less than 1 ppm uncertainty in resistance ratio while overcoming some of the problems of resistance bridges. A new approach was taken with a design that uses the latest integrated-circuit analog-todigital converters. This allows the...
XVII IMEKO World Congress
· TC12
· 2003
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Ali Uytun, Aliye Kartal Dogan, Sevilay Ugur
The International Temperature Scale of 1990 (ITS-90) specifies triple, melting and freezing points to realize the scale. One of the major temperature fixed points in the ITS-90 scale is the triple point of water (TPW), at which temperature solid, liquid and vapour phases of pure water coexist in thermal equilibrium. This temperature has been assigned a value of 273,16 K (0,01°C) on the ITS-90. It is the fundamental definition of the fixed point of the ITS- 90 scale and the one defining fixed point of the Kelvin thermodynamic temperature scale. UME Temperature Laboratory has been constructing...
XVII IMEKO World Congress
· TC12
· 2003
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John Redgrove
A European Virtual Institute for Thermal Metrology (EVITherM) is being developed by a consortium of 34 European institutes, led by NPL and supported by the EC, to ensure that thermal knowledge and services are made available to industry, for the benefit of industrial processes and the environment, offering low-cost easy access, particularly to SMEs. EVITherM will be a co-ordinated Internet-based infrastructure designed to link together the geographically scattered centres of excellence and other groups and organisations concerned with thermal measurements and technology to provide a focal...
XVII IMEKO World Congress
· TC12
· 2003
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Dražen Klaric, Bojan Mazanek, Mladen Boršic
IMEKO World Congress is gathering of experts in the field of metrology. More than 500 abstracts have been received during last year and even more people have registered for attending it. Huge number of applications required usage of modern technologies including Internet as a backbone for communication and interaction among participants and organisers. From one excel table we developed powerful web based application that can handle more than 5000 records thus enabling us to overcome difficulties that faced us during organisation of the congress. In this paper we describe how Croatian...
XVII IMEKO World Congress
· TC11
· 2003
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Fiona Redgrave, Andy Henson, Diane Beauvais
The operation of the economy on a global scale and the quality of life for the individual citizen depends on reliable measurements and tests, which are trusted and accepted internationally. The European Commission is supporting two projects linking measurement, regulation, trade and commerce under the Competitive and Sustainable Growth thematic Programme in the Fifth Framework Programme. This paper describes the aims and some findings of the RegMet and MetroTrade projects, including the concept of the development of a measurement template for regulators.
XVII IMEKO World Congress
· TC11
· 2003
· Download