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
Best Sellers From Metrology Sector
GSO OIML R87:2021
OIML R87:2016
Gulf Standard
Quantity of product in prepackages
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![OIML Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_oiml_sml.png)
GSO OIML R79:2021
OIML R79:2015
Gulf Standard
Labeling requirements for prepackages
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![OIML Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_oiml_sml.png)
OS GSO OIML R76-1:2009
GSO OIML R 76-1:2009
Omani Standard
Non-automatic weighing instruments –
Part 1: Metrological and technical requirements - Tests
![OS Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_os_sml.png)
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![OIML Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_oiml_sml.png)
GSO OIML R 76-1:2009
OIML R 76-1:2006
Gulf Standard
Non-automatic weighing instruments –
Part 1: Metrological and technical requirements - Tests
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![OIML Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_oiml_sml.png)
Recently Published from Metrology Sector
GSO ISO 12999-2:2024
ISO 12999-2:2020
Gulf Standard
Acoustics — Determination and application of measurement uncertainties in building acoustics — Part 2: Sound absorption
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![ISO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_iso_sml.png)
GSO ISO 3864-2:2024
ISO 3864-2:2016
Gulf Standard
Graphical symbols — Safety colours and safety signs — Part 2: Design principles for product safety labels
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![ISO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_iso_sml.png)
GSO ISO 12179:2024
ISO 12179:2021
Gulf Standard
Geometrical product specifications (GPS) — Surface texture: Profile method — Calibration of contact (stylus) instruments
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![ISO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_iso_sml.png)
GSO ISO 14405-2:2024
ISO 14405-2:2018
Gulf Standard
Geometrical product specifications (GPS) — Dimensional tolerancing — Part 2: Dimensions other than linear or angular sizes
![GSO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_gso_sml.png)
![ISO Standard](https://static.gso.org.sa/gso-uicore/assets/images/logo_iso_sml.png)