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To achieve an uncertainty of 0.25 mK in single-pressure refractive-index gasthermometry (SPRIGT), the relative pressure variation of He-4 gas in the range30 kPa to 90 kPa, should not exceed 4 ppm (k=1). To this end, a novel pressurecontrol system has been developed. It consists of two main parts: a pistongauge to control the pressure, and a home-made gas compensation system tosupplement the micro-leak of the piston gauge. In addition, to maintain thepiston at constant height, a servo loop is used that automatically determinesin real time the amount of extra gas required. At room temperature, thestandard deviations of the stabilized pressure are 3.0 mPa at 30 kPa, 4.5 mPaat 60 kPa and 2 mPa at 90 kPa. For the temperature region 5 K-25 K used forSPRIGT in the present work, the relative pressure stability is better than 0.16ppm i.e. 25 times better than required. Moreover, the same pressurestabilization system is readily transposable to other primary gas thermometers.

Realization of ppm level pressure stability for primary thermometry using a primary piston gauge