The Russian National Standard of Gases Humidity and Traceability System of Humidity Measurements

The Russian National Standard of Gases Humidity and Traceability System of Humidity Measurements

The Russian national humidity standard of gases has been modernized in order to increase the number of reproducible quantities of humidity (relative humidity, dew/frost-point temperature, mole fraction) and to extend the humidity and operating temperature ranges. The basis of the standard comprises...

Full description

Saved in:
Bibliographic Details
Published in:International journal of thermophysics Vol. 37; no. 5; pp. 1 - 12
Main Authors: Dubovikov, N. I., Podmurnaya, O. A., Skryabikov, N. P., Sokov, I. A., Vinge, A. F.
Format: Journal Article
Language:English
Published: New York Springer US 01-05-2016
Subjects:
Classical Mechanics
Condensed Matter Physics
Dew
Generators
Humidity
Hygrometers
Industrial Chemistry/Chemical Engineering
Moles
Physical Chemistry
Physics
Physics and Astronomy
Relative humidity
Traceability
Gas humidity
Humidity standard
Hierarchical chain
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The Russian national humidity standard of gases has been modernized in order to increase the number of reproducible quantities of humidity (relative humidity, dew/frost-point temperature, mole fraction) and to extend the humidity and operating temperature ranges. The basis of the standard comprises two humidity generators with operating temperature ranges from 5 ∘ C to 90 ∘ C and from - 60 ∘ C to 15 ∘ C . The common working range (from 5 ∘ C to 15 ∘ C ) allows comparison of the generators. The generators use the two-pressure method to generate humid gas defined in terms of the relative humidity (from 5 %rh to 98 %rh at temperatures from 90 ∘ C to - 60 ∘ C ) and the one-pressure (or phase equilibrium) method to generate humid gas defined in terms of the vapor mole fraction (from 0.6 ppm to 700 × 10 3 ppm) and dew/frost-point temperature (from - 79 ∘ C to 90 ∘ C ). The expanded uncertainty in the relative humidity is no more than 0.2 %rh, no more than 1.2 % in the vapor mole fraction, and no more than 0.12 ∘ C in the dew/frost-point temperature. The ordinary hygrometers are traceable to the national primary standard in accordance with the state hierarchical chain for measuring means of gas humidity. The state hierarchical chain consists of three branches for means of measurements: (a) mole fraction, (b) dew/frost-point temperature, and (c) relative humidity with each branch represented as the scheme: primary standard–secondary standard–working standard–ordinary hygrometer. Calibration and verification of working standards and ordinary hygrometers, and their traceability to the primary standard use methods of (i) direct measurements, (ii) direct comparison, or (iii) comparison with a comparator.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0195-928X
1572-9567
DOI:10.1007/s10765-015-2014-0