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Two new miniature metallic sealed-cells containing the triple point of water, WTP (273.16K) and the triple point of mercury, HgTP (234.3156 K) have been constructed for therealization of the International Temperature Scale of 1990 (ITS-90) at the NationalInstitute of Standards (NIS-Egypt). The new cells will provide facilities for thecalibration of Capsule-type Standard Platinum Resistance Thermometers (CSPRTs). The twocells will complete a multi-cells compartment in order to calibrate CSPRTs in one singleexperiment. The multi-cells compartment contains two other cells; the triple point ofargon (83.8058 K) and the triple point of oxygen (54.3584 K) that has been alreadydeveloped and characterized before [M.G. Ahmed, Y. Hermier, Development of an adiabaticcalorimeter in the range 54 K–273 K in frame of a scientific collaboration LNE-NIS, AIPConf. Proc. 1552, 153 (2013)]. The system can calibrate two CSPRTs at once.The compartment is accommodated in an adiabatic calorimeter. With a special technique, thecalorimeter could go down to a temperature of 52 K using liquid nitrogen and specialpumping system

New temperature reference cells for calibrating CSPRTs under adiabatic conditions