09,18,2026 10 views
Industrial platinum resistanceA thermometer is a widely used temperature measuring instrument. For a long time, the calculation method of CVD equation has been widely used in relevant standards or technical specifications at home and abroad to calibrate it. However, industrial platinum resistance thermometers that use the CVD equation for calibration have low accuracy, low stability, and high uncertainty, and cannot be used as transmission standards.
For this reason, most industrial temperature measurement fields or laboratories with low requirements can only use high-precision standard platinum resistance thermometers as traceability standards. However, in the actual industrial temperature measurement field, due to various limitations, standard platinum resistance thermometers cannot be used, making it impossible to achieve temperature value transmission and traceability in these places, and unable to carry out actual metrological calibration work.
The feasibility of calibrating and dividing industrial platinum resistance thermometers, and comparing them with the temperature resistance relationship calculation results given by the commonly used CVD equation, to identify the differences between the two, and to explore the ways and methods of establishing precision industrial platinum resistance thermometers as transfer standards. By conducting research and analysis on multiple industrial platinum thermistors manufactured by different models and manufacturers in different temperature ranges, the experimental results, data curves, and measurement errors caused by using two different methods to calibrate each thermometer are presented.
Experimental results have shown that the interpolation method of ITS-1990 international temperature scale is feasible for industrial platinum resistance thermometers. Compared with the calculation method of CVD equation for industrial platinum resistance calibration, it has better accuracy and consistency. Previously, the national metrology institutions of Italy and Canada conducted research on the industrial platinum resistance division method using the interpolation formula of the international temperature scale.
The traditional methods to improve the accuracy and stability of industrial resistance temperature measurement are focused on component purity, packaging technology, and manufacturing processes; A new approach has been proposed in terms of calculation methods, laying the foundation for the improvement of temperature value transmission and traceability systems for precision platinum resistors and industrial platinum resistors, which can be widely applied in the temperature measurement field of industrial platinum resistors.
