NDLI: Pressure-Drop Considerations in the Characterization of Dew-Point Transfer Standards at High Temperatures

Content Provider	Springer Nature Link
Author	Mitter, H. Böse, N. Benyon, R. Vicente, T.
Copyright Year	2012
Abstract	During calibration of precision optical dew-point hygrometers (DPHs), it is usually necessary to take into account the pressure drop induced by the gas flow between the “point of reference” and the “point of use” (mirror or measuring head of the DPH) either as a correction of the reference dew-point temperature or as part of the uncertainty estimation. At dew-point temperatures in the range of ambient temperature and below, it is sufficient to determine the pressure drop for the required gas flow, and to keep the volumetric flow constant during the measurements. In this case, it is feasible to keep the dry-gas flow into the dew-point generator constant or to measure the flow downstream the DPH at ambient temperature. In normal operation, at least one DPH in addition to the monitoring DPH are used, and this operation has to be applied to each instrument. The situation is different at high dew-point temperatures up to 95 °C, the currently achievable upper limit reported in this paper. With increasing dew-point temperatures, the reference gas contains increasing amounts of water vapour and a constant dry-gas flow will lead to a significant enhanced volume flow at the conditions at the point of use, and therefore, to a significantly varying pressure drop depending on the applied dew-point temperature. At dew-point temperatures above ambient temperature, it is also necessary to heat the reference gas and the mirror head of the DPH sufficiently to avoid condensation which will additionally increase the volume flow and the pressure drop. In this paper, a method is provided to calculate the dry-gas flow rate needed to maintain a known wet-gas flow rate through a chilled mirror for a range of temperature and pressures.
Starting Page	1726
Ending Page	1740
Page Count	15
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	33
Issue Number	8-9
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2012-10-27
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calibration Generator Humidity Dew-point temperature Pressure drop Standards Condensed Matter Physics Mechanics Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

A Simple Humidity Generator for Relative Humidity Calibrations

Measurement Uncertainty of Dew-Point Temperature in a Two-Pressure Humidity Generator

Bilateral Comparison of Humidity Standards Between UME and MIKES

Consistency of the National Realization of Dew-Point Temperature Using Standard Humidity Generators

A Calibration Facility for Dew Point in Air up to 1 MPa

The New INTA High-Range Standard Humidity Generator and Its Comparison with the Austrian National Humidity Standard Maintained at BEV/E+E

Investigation of Primary Dew-Point Saturator Efficiency in Two Different Thermal Environments

An Investigation of the Relation Between Contact Thermometry and Dew-Point Temperature Realization

Development of a Dew-Point Generator for Gases Other than Air and Nitrogen and Pressures up to 6 MPa

Pressure-Drop Considerations in the Characterization of Dew-Point Transfer Standards at High Temperatures

Similar Documents

A Simple Humidity Generator for Relative Humidity Calibrations

Measurement Uncertainty of Dew-Point Temperature in a Two-Pressure Humidity Generator

Bilateral Comparison of Humidity Standards Between UME and MIKES

Consistency of the National Realization of Dew-Point Temperature Using Standard Humidity Generators

A Calibration Facility for Dew Point in Air up to 1 MPa

The New INTA High-Range Standard Humidity Generator and Its Comparison with the Austrian National Humidity Standard Maintained at BEV/E+E

Investigation of Primary Dew-Point Saturator Efficiency in Two Different Thermal Environments

An Investigation of the Relation Between Contact Thermometry and Dew-Point Temperature Realization

Development of a Dew-Point Generator for Gases Other than Air and Nitrogen and Pressures up to 6 MPa

Pressure-Drop Considerations in the Characterization of Dew-Point Transfer Standards at High Temperatures