Gravimetric Calibration

1 Page 1 SOP 14 – 2019 Page 1 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 SOP No. 14 Recommended Standard Operating Procedure for Gravimetric Calibration of Volumetric Sta... Open at page → 2 Page 2 SOP 14 – 2019 Page 2 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 provide adequate stability and may be used if the uncertainty is sufficiently small and the densi... Open at page → 3 Page 3 SOP 14 – 2019 Page 3 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Summary The electronic balance used is calibrated by incorporating standard masses into the proce... Open at page → 4 Page 4 SOP 14 – 2019 Page 4 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Barometer with resolution and uncertainty less than 135 Pa (1 mmHg) to determine air pressure. 1... Open at page → 5 Page 5 SOP 14 – 2019 Page 5 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 and use for glass flasks. A wet-down is not required for a transfer vessel that is used to weigh... Open at page → 6 Page 6 SOP 14 – 2019 Page 6 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Test the next interval in the same manner - from the zero mark to the next interval of test. For... Open at page → 7 Page 7 SOP 14 – 2019 Page 7 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Make a duplicate determination for the pipet (Run 2) . Calculate the volume as described in Secti... Open at page → 8 Page 8 SOP 14 – 2019 Page 8 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Measure and record the air temperature, air pressure, and relative humidity. Zero the balance and... Open at page → 9 Page 9 SOP 14 – 2019 Page 9 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Zero the balance and then place a standard mass, M S1, on the balance platform (M S1 should be sl... Open at page → 10 Page 10 SOP 14 – 2019 Page 10 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 measure. The wet-down will help equilibrate the test measure with the water temperature. Measure... Open at page → 11 Page 11 SOP 14 – 2019 Page 11 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Zero the balance and then place standard mass es, M S1, on the balance platform. M S1 should be... Open at page → 12 Page 12 SOP 14 – 2019 Page 12 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 3 Calculations Option A – One -point balance calibration. Compute the volume at the temperature... Open at page → 13 Page 13 SOP 14 – 2019 Page 13 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 If using a different reference temperature, use the following equation and take care to match th... Open at page → 14 Page 14 SOP 14 – 2019 Page 14 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 The calculated F statistic must be less than the F value obtained from an F table at 95 % confid... Open at page → 15 Page 15 SOP 14 – 2019 Page 15 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 adjusted value from Run 1 and the value from Run 2, both at the applicable reference temperature... Open at page → 16 Page 16 SOP 14 – 2019 Page 16 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Table 4. Example uncertainty budget table. Uncertainty Component Description Symbol Source Typic... Open at page → 17 Page 17 SOP 14 – 2019 Page 17 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 adjust the standard or leave the scale plate in a position close enough to its nominal volume to... Open at page → 18 Page 18 SOP 14 – 2019 Page 18 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Appendix A (Single-Point Balance Calibration) Gravimetric Calibration Data Sheet (Option A) Labo... Open at page → 19 Page 19 SOP 14 – 2019 Page 19 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Appendix B (Two-Point Balance Calibration) Gravimetric Calibration Data Sheet (Option B) Laborat... Open at page → 20 Page 20 SOP 14 – 2019 Page 20 of 20 This publication is available free of charge from: ht tps://doi.org/10.6028/NIST.IR.7383 - 2019 Appendix C Test Notes for Large Provers 1. Pour and drain times. It is impractical to completely... Open at page →