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Iso 554-1976

ISO 554 is an International Standard that specifies standard atmospheres for conditioning and/or testing, developed by ISO Technical Committee ISO/TC 125. It outlines three standard atmospheres with associated tolerances for temperature and humidity, acknowledging the diversity of climates. The standard replaces ISO Recommendation R 554-1967 and has been approved by multiple countries while facing disapproval from the Netherlands and Sweden on technical grounds.

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Flavio De Melo Silva
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196 views4 pages

Iso 554-1976

ISO 554 is an International Standard that specifies standard atmospheres for conditioning and/or testing, developed by ISO Technical Committee ISO/TC 125. It outlines three standard atmospheres with associated tolerances for temperature and humidity, acknowledging the diversity of climates. The standard replaces ISO Recommendation R 554-1967 and has been approved by multiple countries while facing disapproval from the Netherlands and Sweden on technical grounds.

Uploaded by

Flavio De Melo Silva
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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FOREWORD

ISO (the lnternational Organization for Standardization} is a worldwide federation


of national standards institutes ( ISO Member Bodies). The work of developing
lnternational Standards is carried out through ISO Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. lnternational organizations,
governmental and non·governmental, in liaison with ISO, also take part in the work.

Draft lnternational Standards adopted by the Technical Committees are circulated


to the Member Bodies for approval before their acceptance as I nternational
Standards by the ISO Council.

lnternational Standard ISO 554 (originally ISO/DIS 3736) was drawn up by


Technical Committee ISO/TC 125, Enc/osures and conditions for testing, and
circulated to the Member Bodies in March 1975.

lt has been approved by the Member Bodies of the following countries :

Australia Germany Thailand


Austria lndia Turkey
Belgium New Zealand United Kingdom
Czechoslovakia Romania U.S.A.
Finland South Africa, Rep. of U.S.S.R.
France Spain

The Member Bodies of the following countries expressed disapproval of the


document on technical grounds :

Netherlands
Sweden

This lnternational Standard cancels and replaces ISO Recommendation R 554-1967,


of which it constitutes a technical revision.

© lnternational Organization for Standardization, 1976 •

Printed in Switzerland
INTERNATIONAL STANDARD ISO 554-1976 (E)

Standard atmospheres for conditioning and/or testing


Specifications

O INTRODUCTION 2 SPECIFICATIONS

2.1 Standard atmospheres for conditioning and/or testing


The ideal would be for a single atmosphere for conditioning
and/or testing to be specified, but this simple solution has Relativa
not been possible because of the diversity of climates and Temperatura Pressure
Designation humidity Remarks
because of the difficulty of establishing tables of values
ºC % kPa
reduced to this single standard atmosphere, from test
results obtained previously under various tests and/or Recommended
23/50 23 50
atmosphere
conditioning atmospheric conditions.
between For tropical
27/65 27 65
86 countries
lt is desirable, however, in the implementation of this and
Used in
lnternational Standard, that every effort should be made to 106
certain
use a single atmosphere selected from those given in this 20/65 20 65
fields of
document. application

2.2 Tolerances

1 SCOPE ANO FIELD OF APPLICATION Relativa


Temperatura
Tolerances humidity

ºC %
This lnternational Standard lays down three standard at·
mospheres for conditioning and/or testing which are not Ordinary (normal)
tolerances ±2 ± 5*
very different from ordinary ambient conditions.
(wide tolerances)
Reduced tolerances
±1 ± 2*
(close tolerances)

* The resultant limits of relative humidity are therefore :


ordinary (normal) tolerances : (45 to 55 %) and (60 to 70 %);
- reduced tolerances : (48 to 52 %) and (63 to 67 %).

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