Novel Calibration Technique for a Coulometric Evolved Vapor Analyzer for Measuring Water Content of Materials

Bell, S A; Miao, Peng Cheng; Carroll, P

doi:10.1007/s10765-018-2368-1

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…While certified reference materials with known water content are frequently used, their availability is often limited, and they may not always offer suitable values or materials that guarantee both SI traceability and well-characterised uncertainty [16]. An alternative calibration approach is presented in [17], which utilises the water content of humid gas with a defined dewpoint as a reference. This approach provides traceability to the SI through national humidity standards, offering a reliable foundation for calibration.…”

Section: Lne-cetiat Reference Method: Evolved Eater Vapour Coulometri...mentioning

confidence: 99%

Calibration Techniques for Water Content Measurements in Solid Biofuels

Kjeldsen,

Østergaard,

Strauss

et al. 2024

Energies

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This paper presents methodologies and equipment for SI-traceable inline measurements of water content (a critical quality parameter) in solid biofuels. Inline measurement systems for water content are commonly used at CHP plants, providing continuous real-time data. However, the accuracy of these systems is in most cases unsatisfactory, mainly because the systems are not calibrated representatively for the relevant material, and until now, calibrations traceable to the SI system have not been available. To provide reliable and accurate inline water content data, new procedures and equipment for calibrating measurement systems were developed. Two reference methods for the determination of water content were developed; one measures the airflow and dewpoint of desorbed water in the air passing a test sample, while the other uses a P2O₅-sensor. Additionally, a transfer standard based on a cavity resonance sensor was developed for fast onsite calibration of the inline sensor at the power plant. This new instrument allows for quick and accurate measurements. The transfer standard is made metrologically traceable to the primary measurement standards. The entire system was demonstrated by calibrating an inline microwave-based (MW) sensor at the CHP plant of VERDO in Randers, Denmark. Thus, a complete metrological traceability chain was established from an industrial to a primary standard.

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Section: Lne-cetiat Reference Method: Evolved Eater Vapour Coulometri...mentioning

confidence: 99%

Calibration Techniques for Water Content Measurements in Solid Biofuels

Kjeldsen,

Østergaard,

Strauss

et al. 2024

Energies

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“…In chemistry, PMMs are gravimetry, titrimetry, isotope dilution mass spectrometry and coulometry [12], an example of the latter being EWV. Despite being PMMs, recent publications have demonstrated the usefulness of calibrating EWV and Karl Fischer titration (KFT), when highly accurate results are desired [13][14][15]. As PMMs, EWV and KFT are used to calibrate secondary measurement methods, to ensure traceability to SI units [10,16].…”

Section: Introductionmentioning

confidence: 99%

Calibration and Uncertainty Estimation for Water Content Measurement in Solids

et al. 2021

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In the field of water content measurement, the calibration of coulometric methods (e.g., coulometric Karl Fischer titration or evolved water vapor analysis) is often overlooked. However, as coulometric water content measurement methods are used to calibrate secondary methods, their results must be obtained with the highest degree of confidence. The utility of calibrating such instruments has been recently demonstrated. Both single and multiple point calibration methods have been suggested. This work compares these calibration methods for the evolved water vapor analysis technique. Two uncertainty estimation approaches (Kragten’s spreadsheet and M-CARE software tool) were compared as well, both based on the ISO GUM method.

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“…Thus, the traceability to SI is obtained through traceable measurements of sample mass, flow rate, temperature and dew-point temperature. More detailed information about the NPL standard is given in [6]. which were analysed to ensure the reliability of the results.…”

Section: Introductionmentioning

confidence: 99%

New Primary Standards for Establishing SI Traceability for Moisture Measurements in Solid Materials

et al. 2017

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A European research project METefnet addresses a fundamental obstacle to improving energy intensive drying process control: due to ambiguous reference analysis methods and insufficient methods for estimating uncertainty in moisture measurements, the achievable accuracy in the past was limited and measurement uncertainties were largely unknown. This paper reports the developments in METefnet that provide a sound basis for the SI traceability: four new primary standards for realising the water mass fraction were set up, analysed and compared to each other. The operation of these standards is based on combining sample weighing with different water vapour detection techniques; cold trap, chilled mirror, electrolytic and coulometric Karl Fischer titration. The results show that an equivalence of 0.2 % has been achieved between the water mass fraction realisations and that the developed methods are applicable to wide range of materials.

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Novel Calibration Technique for a Coulometric Evolved Vapor Analyzer for Measuring Water Content of Materials

Cited by 5 publications

References 3 publications

Calibration Techniques for Water Content Measurements in Solid Biofuels

Calibration Techniques for Water Content Measurements in Solid Biofuels

Calibration and Uncertainty Estimation for Water Content Measurement in Solids

New Primary Standards for Establishing SI Traceability for Moisture Measurements in Solid Materials

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