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Practical Experiences with OIML R60: Insights on Load Cells and Environmental Effects

This document presents practical experiences and findings related to OIML R60 standards for load cells. It covers essential topics such as excitation voltage, materials, force introduction methods, and various environmental factors affecting load cell performance. Key influences like eccentricity, temperature stability, air flow, and drying effects are examined. Each section details experimental results and measurements, offering a comprehensive overview for engineers and professionals in metrology. This resource serves as a guideline for understanding factors that impact load cell accuracy and reliability.

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Practical Experiences with OIML R60: Insights on Load Cells and Environmental Effects

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  1. Practical experiences with OIML R60 Sascha Mäuselein Oliver Mack

  2. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  3. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  4. Excitation voltage – creep Excitation voltage5 V Z = 5000 Excitation voltage10 V Z < 3000 Creep, DR and error limit of a C3-LC (300g)at 40°C as function of time

  5. Excitation voltage – load cell errors Excitation voltage5 V Excitation voltage10 V Load cell errors of a 600 kg LC (C5)

  6. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  7. Force introduction – material Force introduction made ofstainless steel Y = 20000 Force introduction made ofaluminium Y = 4500 Influence of temperature on MDLO in v for a C3 LC and mpe for Y = 20000 as function of ambient temperature

  8. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  9. Force introduction – types Force introduction viaplatform n = 1500 Force introduction viasuspension gear n = 3000 Load cell errors of a 8kg single point LC (C3)

  10. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  11. Force introduction – embodiment Load cell errors of a LC for different punctual force introductions

  12. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  13. Eccentricity Mpe for class C3 and load cell errors in units of vas function of load for a 8 kg LC

  14. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  15. Stability of temperature Zero signal of a single point LC (C3, 140kg) in units of vas function of time at 40°C and 85%rH Variation of zero signal of 4 vat a variation of temperature of 2°C

  16. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  17. Air flow Zero signal of a single point LC (C3, 140kg) in units of vas function of time at 41°C and 85%rH Variation of zero signal of 0,5 v

  18. Air flow Reduction ofair flow by a tent Zero signal of a single point LC (C3, 140kg) in units of vas function of time at 41°C and 85%rH; LC in tent Variation of zero signal of 0,02 v  Reduction by a factor of 25

  19. Table of contents • Excitation voltage • Force introduction • Material • Types • Embodiment • Eccentricity • Stability of temperature • Air flow • Settling- and Drying-effects

  20. Settling- and drying-effects 1. first creep measurement at 20°C;after delivery 2. first creep measurement at 40°C -> failed -> failed

  21. Settling- and drying-effects 3. first creep measurement at -10°C 4. repeat of creep measurement at 20°C -> passed -> passed

  22. 3 days storingat 40°C Settling- and drying-effects 5. repeat of creep measurement at 40°C 6. further creep measurement at 40°Cafter 3 days storing at 40°C -> passed -> failed

  23. Table of contents • Excitation voltage -> Creep and LC error • Force introduction • Material -> Zero point (Y) • Types -> LC error • Embodiment -> LC error • Eccentricity -> LC error • Stability of temperature -> Zero signal, LC signal • Air flow -> Zero signal, LC signal • Settling- and Drying-effects -> Creep

  24. Thank you for your attention Practical experiences with OIML R60 Sascha Mäuselein Oliver Mack

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