BS EN ISO 139:2005 pdf download

11-18-2020 comment

BS EN ISO 139:2005 pdf free download.Textiles — Standard atmospheres for conditioning and testing.
The tolerances for temperature and relative humidity given in ISO 139: 1973 were the tolerances for temperature and relative humidity measured in the laboratory, and without any consideration for the uncerta of measurement of the measuring devices being used.
With the increased understanding since 1973 and the existence now of standards covering these issues(e.g. ISO14253-1),it is now necessary to allow for the uncertainty of measurement when setting appropriate tolerances.
This second edition of SO 139 includes the allowance for uncertainty of measurement in the overall tolerances for temperature and relative humidity.
This means that although the tolerances for temperature and relative humidity appear more lenient than in ISO 139: 1973,in practice, the aboratory must still be controlled (measured temperature and humidity) to essentially the same level as stated in ISO 139: 1973.
BS EN ISO 139:2005 defines the characteristics and use of a standard atmosphere for conditioning, for determining the physical an mechanical properties of textiles and a standard alternative atmosphere that ma be used if agreed between parties.
4.2 Limitations to measurement devices
Devices used for the measurement of relative humidity and temperature in the conditioned atmosphere shall be separate from those normally used for controlling heating, ventilation and air conditioning ducts.
5 Procedures
5.1 Reading frequency for continuous monitoring
Sensor readings of a conditioned atmospheric enclosure shall be made at such a frequency that any short-term out-of-tolerance-limit events can be detected (see Annex A for additional information).
5.2 Spatial variation
More than one measuring devices might be required to ensure adequate monitoring of the atmospheric conditions throughout the enclosure (see Annex A).
A.1 General
An air-conditioned laboratory shall provide and maintain a standard atmosphere as defined in 3.1 or 3.2, withi the tolerance zone as defined in 3.3.
The specified condition of temperature and relative humidity shall be considered to have been attained when the following requirements are satisfied.
a)The mean temperature and relative humidity over any continuous 1 h period shall conform to the tolerance zone at the standard atmosphere conditions.
b)The spatial variation of the standard atmosphere shall comply with the specified tolerance zone.

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