Validated against IEC 60751 standards
These calculators have been carefully reviewed and AI‑assisted to confirm accuracy against relevant standards.
While care has been taken to ensure technical correctness, no responsibility is accepted for how results are used. Users must verify all outputs for suitability within their own processes and quality systems.
This audit reviews the RTD Coefficient Calculator hosted at calibration.info. Using AI-assisted analysis, the calculator’s mathematical implementation was checked against the IEC 60751 standard to confirm accuracy and suitability for professional use.
The audit confirms compliance with IEC 60751, which governs industrial platinum resistance thermometers. The calculator applies the Callendar‑Van Dusen equations:
R(t) = R₀ × (1 + A×t + B×t²)R(t) = R₀ × (1 + A×t + B×t² + C×(t‑100)×t³)Standard IEC 60751 coefficients are used: A = 3.9083 × 10⁻³ °C⁻¹, B = –5.775 × 10⁻⁷ °C⁻², C = –4.183 × 10⁻¹² °C⁻⁴.
The calculator’s methodology is correct and follows accepted procedures for deriving Callendar‑Van Dusen coefficients (A, B, C) from calibration data. Its strengths include robust input validation, flexibility in reference points, and proper handling of negative temperature ranges.
Algebraic checks confirm the calculator correctly solves the system of equations for A and B using two positive-temperature calibration points, and derives C by comparing measured and expected resistance at a negative temperature point. Sample checks confirmed all calculations matched expected IEC 60751 outputs.
Conclusion: This calculator has been independently validated with AI-assisted review and is compliant with IEC 60751. It is suitable for deriving RTD coefficients for calibration work, but final responsibility for use rests with the user.