GSO OIML R121:2007
Gulf Standard
Current Edition
Approved on
05 June 2007
The Scale of Relative Humidity of Air Certified Against Saturated Salt Solutions
GSO OIML R121:2007 Files
Arabic
12 Pages
Current Edition
Free
English
8 Pages
Current Edition
Reference Language
Free
GSO OIML R121:2007 Scope
The relative humidity scale certified with the help of saturated salt solutions is
used in hygrometry in the relative humidity (RH) fixed points method. It is a
subsidiary scale comprising a number of fixed points reproduced by secondary
standards for humidity measurements.
The RH fixed points represent some specific RH values that are established at a
certain temperature over saturated solutions of salts arising from the hygrostatic
properties of such solutions.
This standard specifies a set of selected saturated salt solutions whose RH
values at a specific temperature correspond to fixed points (or scale marks) of
the scale of relative humidity. Moreover, it indicates the conditions under
which saturated solutions can be used as hygrostatic solutions.
The fixed points method is convenient, inexpensive and reproducible. It is
often used for the calibration and checking of instruments that are generally
used in industry and research laboratories to measure the relative humidity of
air.
The use of hygrostatic solutions has also been described in GSO standard to be
approved by the organization (1) and GSO standard to be approved by the
organization (2) and in national standards [3, 4, 5].
The properties of the solutions and of the water vapor pressure over these
solutions have been the subject of numerous studies in a great number of
laboratories
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