METHOD OF DETERMINATION OF ERRORS OF THERMOELECTRIC THERMOMETERS Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: reading α₁ of thermometer is registered, working junction of thermal converter is cooled for time Δt which is less than thermal constant of junction time. Reading α₂ is registered, cooling is stooped and achievement of starting reading α₁ is fixed. Working junction of thermal converter is heated by passing of constant current 1 through thermocouple wires for the coarse of time Δt₀ lesser than thermal constant of conversion time. Reading α₃ of thermometer is registered. After this working junction is cooled again for original time Δt and reading α₄ of thermometer is registered. Value Δ of error of thermometer is found by formula D=α₁-(α₁-α₂)/(α₃+α₂-α₁-α₄)KJΔt₀, where K is thermal coefficient of thermal converter determined in process of calibration. EFFECT: increased accuracy of determination of errors of thermoelectric thermometers under conditions of their continuous use, reduced time of testing. 2 dwg