NBN EN 437 : 2003 + A1 2009
Current
The latest, up-to-date edition.
TEST GASES - TEST PRESSURES - APPLIANCE CATEGORIES
12-01-2013
Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 Gases
4.1 Classification
4.2 Test gases
5 Test pressures
6 Classification of appliances
6.1 Appliance categories
6.1.1 General
6.1.2 Category I
6.1.3 Category II
6.1.4 Category III
6.2 Operations permitted for a change of gas or
pressure, adjustment and regulating devices
7 Choice of test gases and test pressures
8 Marking
Annex A (normative) - Conditions for preparation of the test
gases
Annex B (informative) - National situations
B.1 - General
B.2 - Categories listed in the body of the standard
marketed in the different countries
B.3 - Appliance supply pressures corresponding to the
categories given in B.2
B.4 - Special categories marketed nationally or locally
B.5 - Test gases and test pressures corresponding to
the special categories given in B.4
B.6 - Special conditions
Annex C (informative) - Guidelines for extension to other
categories
Annex D (informative) - National situation of countries whose
national bodies are CEN affiliate
D.1 - General
D.2 - Categories listed in the body of the standard
marketed in the different countries
D.3 - Supply pressures of the appliances
D.4 - Special categories marketed nationally or locally
D.5 - Gases and test pressures corresponding to
the special categories given in D.4
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