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|Author(s):||Gregory F. Strouse; Billy W. Mangum; C D. Vaughn; E Xu;|
|Title:||A New NIST Automated Calibration System for Industrial-Grade Platinum Resistance Thermometers|
|Published:||September 01, 1998|
|Abstract:||Industrial-grade platinum resistance thermometers (IPRTs) are calibrated at NIST using a newly automated calibration system. The computer-controlled data-acquisition system is used to calibrate IPRTs over the range from -196 degrees C to 550 degrees C using fixed-points (ice point, triple-point of water and Ga melting point) and comparison baths (cryogenic, water, oil, and salt). A standard platinum resistance thermometer, calibrated on the International Temperature Scale of 1990, is used with a commercially available 30 Hz automatic-balancing ratio bridge to determine the temperature of the comparison baths during measurements. A dc measurement system consisting of an 8.5 digit multimeter, constant current source and a reference resistor is used to determine the resistance of the IPRTs under test. The automated calibration system and uncertainties will be discussed.|
|Citation:||NIST Interagency/Internal Report (NISTIR) - 6225|
|Keywords:||industrial-grade PRT,IPRT,IPRT calibration,platinum resistance thermometer,PRT calibrator|
|PDF version:||Click here to retrieve PDF version of paper (215KB)|