DOI:
https://doi.org/10.14483/23448393.23151Published:
2025-10-22Issue:
Vol. 31 No. 2 (2026): May-AugustSection:
Mechanical EngineeringCalibration of an External Pressure Cell Coupled to a Digital Densimeter for Measuring Liquid Densities
Calibración de una célula de presión externa acoplada a un densímetro digital para medir densidades de líquidos
Keywords:
density, pressure, temperature, uncertainty (en).Keywords:
densidad, presión, temperatura, incertidumbre (es).Downloads
Abstract (en)
Context: The accurate determination of density is crucial because density is an important property in the custody transfer of fluids and in other applications, such as the characterization of fuels and biofuels.
Method: The calibration of the pressure cell, which is connected to the digital densimeter, was performed according to the measurement standards of the Fluids Laboratory of the Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro). This calibration involved determining an internal adjustment factor, which was obtained at each calibration temperature, from 277.15 K to 313.15 K, over a pressure range from 0.1 MPa to 15 MPa. Additionally, reference solutions were used under the same temperature and pressure conditions, as specified by the operational requirements.
Results: The relative expanded uncertainty associated with the calibration curve is 0.00030 g/cm³, for a coverage factor of 2.058 (95% confidence level). It applies to a density range from 0.7033 g/cm³ to 1.0064 g/cm³, a temperature range from 277.15 K to 313.15 K, and a pressure range from 0.1 MPa to 15.0 MPa.
Conclusions: With the pressure cell and all its instruments properly calibrated, this system can be used for a variety of applications within a temperature range from 277.15 K to 313.15 K and a pressure range from 0.1 MPa to 15.0 MPa, including pycnometer calibration, the measurement of liquid densities from 0.7033 g/cm³ to 1.0064 g/cm³, and the calibration of other pressure cells.
Abstract (es)
Contexto: La determinación exacta de la densidad es crucial, ya que la densidad es una propiedad importante en la transferencia de custodia de fluidos y en otras aplicaciones, como la caracterización de combustibles y biocombustibles.
Método: La calibración de la celda de presión, que está conectada al densímetro digital, se realizó de acuerdo con los patrones de trabajo del Laboratorio de Fluidos del Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro). Esta calibración implicó determinar un factor de ajuste interno, que se obtuvo en cada temperatura de calibración, desde 277,15 K hasta 313,15 K, en un rango de presión de 0,1 MPa a 15 MPa. Además, se utilizaron soluciones de referencia en las mismas condiciones de temperatura y presión, tal como lo especifican los requisitos operacionales.
Resultados: La incertidumbre expandida relativa asociada con la curva de calibración es de 0,00030 g/cm³, para un factor de cobertura de 2,058 (nivel de confianza del 95 %). Se aplica a un rango de densidad de 0,7033 g/cm³ a 1,0064 g/cm³, un rango de temperatura de 277,15 K a 313,15 K y un rango de presión de 0,1 MPa a 15,0 MPa.
Conclusiones: Con la celda de presión y todos sus instrumentos debidamente calibrados, este sistema puede utilizarse para diversas aplicaciones dentro de un rango de temperatura de 277,15 K a 313,15 K y un rango de presión de 0,1 MPa a 15,0 MPa, entre ellas la calibración de picnómetros, la medición de la densidad de líquidos de 0,7033 g/cm³ a 1,0064 g/cm³ y la calibración de otras celdas de presión.
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