Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods
Humidity measurements are crucial across various industries to ensure product quality, safety, and process efficiency. These measurements can be expressed as absolute quantities, such as frost/dew point, temperatures point, tf/td, or as relative humidity, U, which relates to saturation at a given te...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2025-01-01
|
| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2025/08/epjconf_cim2025_07003.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849732075961188352 |
|---|---|
| author | Furtado Andreia Zenebe Fitsum Subas Özkan Schwinghammer Michael Giri Praveen |
| author_facet | Furtado Andreia Zenebe Fitsum Subas Özkan Schwinghammer Michael Giri Praveen |
| author_sort | Furtado Andreia |
| collection | DOAJ |
| description | Humidity measurements are crucial across various industries to ensure product quality, safety, and process efficiency. These measurements can be expressed as absolute quantities, such as frost/dew point, temperatures point, tf/td, or as relative humidity, U, which relates to saturation at a given temperature. Chilled-mirror hygrometers are widely used in high-precision industrial and research applications due to their broad measurement range, stability, and accuracy. Ensuring metrological traceability requires rigorous calibration using traceable methods. The DAkkS-accredited Calibration Laboratory of Process Insights follows DKD-R 5-8 [1] guidelines and meets ISO 17025 [2] requirements, employing both primary and secondary calibration methods for tf/td over the range [-90, 95] °C, and U over the range [1, 98] %rh. Primary calibration achieves the lowest uncertainties using in-house 1-pressure and 2-pressure humidity (Utf/tf : 0.4 K - 45 mK and UU: 0.10 - 0.39 %rh), while secondary calibration relies on stable CM hygrometers and commercial humidity generators (Utf/tf : 0.54 K - 70 mK and UU: 0.10 - 0.49 %rh). For relative humidity calibration, both tf/td [1] and temperature [3] sensors require calibration. Humidity calculations follow established references, ensuring high accuracy [4, 7-8]. This work outlines the methodologies and challenges in maintaining traceability and accuracy in high accuracy humidity measurements at PI Cal. |
| format | Article |
| id | doaj-art-4b6d456e418b40fc92d2ff6a665d95cc |
| institution | DOAJ |
| issn | 2100-014X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj-art-4b6d456e418b40fc92d2ff6a665d95cc2025-08-20T03:08:20ZengEDP SciencesEPJ Web of Conferences2100-014X2025-01-013230700310.1051/epjconf/202532307003epjconf_cim2025_07003Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration MethodsFurtado Andreia0Zenebe Fitsum1Subas Özkan2Schwinghammer Michael3Giri Praveen4Process Insights GmbH, Calibration CenterProcess Insights GmbH, Calibration CenterProcess Insights GmbH, Calibration CenterProcess Insights GmbH, Calibration CenterProcess Insights GmbH, Calibration CenterHumidity measurements are crucial across various industries to ensure product quality, safety, and process efficiency. These measurements can be expressed as absolute quantities, such as frost/dew point, temperatures point, tf/td, or as relative humidity, U, which relates to saturation at a given temperature. Chilled-mirror hygrometers are widely used in high-precision industrial and research applications due to their broad measurement range, stability, and accuracy. Ensuring metrological traceability requires rigorous calibration using traceable methods. The DAkkS-accredited Calibration Laboratory of Process Insights follows DKD-R 5-8 [1] guidelines and meets ISO 17025 [2] requirements, employing both primary and secondary calibration methods for tf/td over the range [-90, 95] °C, and U over the range [1, 98] %rh. Primary calibration achieves the lowest uncertainties using in-house 1-pressure and 2-pressure humidity (Utf/tf : 0.4 K - 45 mK and UU: 0.10 - 0.39 %rh), while secondary calibration relies on stable CM hygrometers and commercial humidity generators (Utf/tf : 0.54 K - 70 mK and UU: 0.10 - 0.49 %rh). For relative humidity calibration, both tf/td [1] and temperature [3] sensors require calibration. Humidity calculations follow established references, ensuring high accuracy [4, 7-8]. This work outlines the methodologies and challenges in maintaining traceability and accuracy in high accuracy humidity measurements at PI Cal.https://www.epj-conferences.org/articles/epjconf/pdf/2025/08/epjconf_cim2025_07003.pdf |
| spellingShingle | Furtado Andreia Zenebe Fitsum Subas Özkan Schwinghammer Michael Giri Praveen Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods EPJ Web of Conferences |
| title | Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods |
| title_full | Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods |
| title_fullStr | Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods |
| title_full_unstemmed | Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods |
| title_short | Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods |
| title_sort | frost dew point temperature and relative humidity measurements primary and secondary calibration methods |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2025/08/epjconf_cim2025_07003.pdf |
| work_keys_str_mv | AT furtadoandreia frostdewpointtemperatureandrelativehumiditymeasurementsprimaryandsecondarycalibrationmethods AT zenebefitsum frostdewpointtemperatureandrelativehumiditymeasurementsprimaryandsecondarycalibrationmethods AT subasozkan frostdewpointtemperatureandrelativehumiditymeasurementsprimaryandsecondarycalibrationmethods AT schwinghammermichael frostdewpointtemperatureandrelativehumiditymeasurementsprimaryandsecondarycalibrationmethods AT giripraveen frostdewpointtemperatureandrelativehumiditymeasurementsprimaryandsecondarycalibrationmethods |