Development of temperature fixed points applicable to the calibration of thermometers in magnetic fields

Two temperature fixed points, (H₂O and Ar) were developed to be used under magnetic fields. They serve as ideal tools to investigate the magnetic field dependence of temperature sensors. The sensors studied are Cernox™, a platinum resistance thermometer, and a thermistor. The magnetic field effect on Cernox was found to be not larger than 5 mK under 15 T at the triple point of water. The applicability of Kohler´s rule was evaluated by a PRT and was found to be valid within 3%. The magnetic field effect on the thermistor studied was found to be 15 mK at 15 T.