Design, Control and Optimization of the Weighing Mechanism for the HWA-NIS up to 20 kg

Sayed, B. M.; Azzam, Ali; Abdou, B. M. Z.; Eltawil, Alaaeldin A.

doi:10.1109/icisce.2016.74

Cited by 1 publication

(4 citation statements)

References 6 publications

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“…For the 2 kg, 5 kg, 10 kg and 20 kg masses, the previous values for the surface tension uncertainty percentage were 69.0%, 48.0%, 31.0% and 19.0% have been improved to 18.5%, 12.0%, 6.8% and 3.6% respectively and observed that its values decreased by increasing the nominal mass values. Figure 15 shows the relation between the nominal mass against a comparison for the expanded uncertainty obtained from using the developed weighing pan and the expanded uncertainty obtained from the previous weighing pan [10] in the masses from 2 kg up to 20 kg. The expanded uncertainties were 0.00083 g/cm 3 , 0.00063 g/cm 3 , 0.00048 g/cm 3 and 0.00040 g/cm 3 in the masses of 2 kg, 5 kg, 10 kg and 20 kg respectively [10].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 15 shows the relation between the nominal mass against a comparison for the expanded uncertainty obtained from using the developed weighing pan and the expanded uncertainty obtained from the previous weighing pan [10] in the masses from 2 kg up to 20 kg. The expanded uncertainties were 0.00083 g/cm 3 , 0.00063 g/cm 3 , 0.00048 g/cm 3 and 0.00040 g/cm 3 in the masses of 2 kg, 5 kg, 10 kg and 20 kg respectively [10]. These uncertainties were improved by about five times and became 0.000149 g/cm 3 , 0.000092 g/cm 3 , 0.000081 g/cm 3 and 0.000078 g/cm 3 in the masses of 2 kg, 5 kg, 10 kg and 20 kg respectively due to improve the measurement performance and reducing the effect of surface tension via the developed design of the weighing pan.…”

Section: Resultsmentioning

confidence: 99%

“…Represent the product of the combined standard measurement uncertainty and a coverage factor k = 2 at a confidence level of 95% which can be calculated from equation (10) Uðr t Þ ¼ 2 Â uðr t Þ ð 10Þ…”

Section: Expanded Uncertainty U (Rt)mentioning

confidence: 99%

“…Hence this weighing pan suspension wire was affected with 92 mg standard uncertainty. The weighing pan was designed to carry a mass with a maximum capacity of 10 kg and theoretically to 20 kg [10] but still its suspension wire diameter of 4 mm which gives a large surface tension uncertainty source effect by about 80 % of the total expanded uncertainty.…”

Section: Introductionmentioning

confidence: 99%

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Developing the NIS solid density hydrostatic weighing system up to 20 kg

Hamdy

Bayoumi

Abuelezz

et al. 2020

Int. J. Metrol. Qual. Eng.

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This paper presents a developed design and construction to improve the performance and increasing the density measuring capability of the previous Hydrostatic Weighing Apparatus (HWA-NIS) at the National Institute of Standards (NIS) up to 20 kg. The previous (HWA-NIS) has been constructed up to 10 kg on 2014. The 2-Positions mass handler in the previous (HWA) was developed with 4-Positions pentagon shape to be able to make handling for individual masses in a group at once, when transferring the traceability from the primary standard “the Silicon Sphere” to the standard masses in the density scale weighing process. The weighing pan in the previous (HWA) was developed with four suspension wires with a diameter of 0.3 mm each, leads to reduce the surface tension affect on the measurement uncertainty by factor four times. The density of the standard masses in the range from 2 kg up to 20 kg were measured with an improved expanded uncertainty from 0.150 kg/m3 to 0.078 kg/m3 respectively due to reducing the effect of surface tension via the developed design of the weighing pan.

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Section: Resultsmentioning

confidence: 99%