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Totally frozen water triple point cells: a comparison between the INTI (Argentina) and the ICAITI (Guatemala)

A water triple point (WTP) cell maintained for the past three years at the Instituto Nacional de Tecnología Industrial (INTI, Argentina) in a totally frozen state, was compared on three consecutive Mondays with a WTP cell from the Instituto Centroamericano de Investigación y Tecnología Industrial (ICAITI, Guatemala). The latter was prepared by letting it freeze slowly and completely over a period of one month in an ice bath at 0 °C, under the influence of the 0,01 °C temperature difference. Preparation an measuring techniques are described. Since measurements were performed using four polarizing currents (5 mA, □2 × 5 mA, 10 mA, and □2 × 10 mA), results are compared using two, three, and four currents, in order to extrapolate to zero power. The main results were the following. By comparing the temperatures measured on the same day, the WTP temperatures realized using the two cells differed by less than ±24 µK (±5 µK when using only three currents for extrapolation). These differences do not depend on the long-term stability of the measuring system. By comparing the temperatures measured over the two-week period, the maximum temperature difference measured within a single cell was 129 µK (82 µK when using only three currents for extrapolation). These differences reflect the long-term instability of the measuring system, but should have a limited effect on precision thermometry.