This paper presents a preliminary methodology for the calculation of measurement uncertainty of temperature sensors in dynamic regime. The experimental results show that the proposed methodology is suitable for the determination of the measurement uncertainty in the transient state of the calibration process.

It is good calibration practice to test thermocouples for homogeneity of the Seeback’s coefficient during calibration process. If change in homogeneity the coefficient, commonly known as inhomogeneity is not detected, thermometer although calibrated might not be able to measure temperature correctly. Several different testing techniques are developed, depending on type of the thermocouple and the equipment available. In order to automate process of thermocouple inhomogeneity testing for all applicable testing methods a Thermocouple Inhomogeneity Testing Device was developed in Laboratory for Process Measurement (LPM), University of Zagreb. The device is mostly used for the testing of thermocouple inhomogeneity in conjunction with heater moving along the thermocouple. The sled for mounting of the heater or the thermometer is translated by a threaded shaft and a step motor in horizontal axis, vertical axis or its sliding direction can be tilted in six steps between those two positions. Sled is mounted on shafts guides with precision linear ball bearing, which allow for smooth translation. The frame of the device is designed with adjustable height and distance between legs, which allows testing in most available metrological baths or furnaces. System is controlled by custom made program on LabView platform, with ability to automatically acquire, store and analyze data test data. Variation of the thermovoltage recorded during measurement is used in calculation of the uncertainty of the calibration. This paper describes the techniques for inhomogeneity testing and design of the testing device. Interpretation of the measurement results and calculation of inhomogeneity related component of the uncertainty budget is presented.

This paper describes in detail the spectral responsivity calibration of the Linear Pyrometer of the Thermal Metrology Division (Diter) of Inmetro. This calibration was performed at the Radiometry Laboratory (Larad) of the Optical Metrology Division (Diopt). It was made using two different experimental setups. In the first one, mirrors were used to direct the radiation beam from the exit slit of the monochromator to the entrance of the detectors. In the second setup the detectors were aligned directly in the exit slit of the monochromator. The spectral responsivity values in the first setup were lower than the second one. The uncertainty evaluation was performed for the second configuration data. The characterisation process of the linear pyrometer, will allow the maintenance of the International Temperature Scale of 1990 (ITS-90) on the instrument itself.

We report the status of development of metalcarbon eutectic cells for contact thermometry at KRISS. Up to now, Co-C, Ni-C, Fe-C and Pt-C eutectic cells have been fabricated and their performance has been tested. The uncertainty of Co-C melting point using a Type B thermocouple was 0.9°C (k = 2). The melting plateau of the Fe-C eutectic cell has shown a dependence on the prefreezing set temperature.

A numerical investigation of zinc freezing point is presented. Comparison of results for the solidification of same alloy using two different sets of data shows the need to have accurate phase-equilibrium data and the necessity of considering all of elements present in an alloy. The results give an indication of what areas require more careful examination if accurate modeling of freezing point is to be accomplished.