IMPROVING THE ALGORITHM FOR CALCULATING THE TEMPERATURE OF THE QUASILINEAR RESISTANCE SENSOR PT100

The paper investigates iterative algorithms for solving the equation according to Kalendar-Van Dusyn formula, which describes dependence of electrical resistance Pt100 family sensor on temperature. This platinum sensors is considered quasi-linear, but high-precision measurements nonlinearity cannot be neglected, so it necessary solve nonlinear Pt100. At minus temperatures, formula reaches fourth power and has no solution with respect temperature in an analytical form. analysis previously published algorithm approximate reveals a desadvantage this algorithm. residual error not monotonic function argument, because contains extrema, moreover, sign changes opposite after each extremum. purpose study was obtain that provides form deterministic argument minimization maximum value. possibility modify algorithm-prototype elementary way by fixing number iterations shown. modified argument. It assumed any calculation can improved way. same time, values achieved setting compared prototype To overcome algorithm, new proposed, which, addition fixed iterations, property smallness components higher degrees used. high efficiency shown, reduces negligible value just four iterations. claimed makes further research direction its improvement unnecessary. article presents scheme corresponding program VBA platform Excel, suitable direct use software meters based sensors. References 5, figures 4, tables 3.