NF EN 61779-1 : 2005 AMD 11 2005

1 General
  1.1 Scope
  1.2 Normative references
2 Definitions
  2.1 Gas properties
  2.2 Types of instruments
  2.3 Sensors
  2.4 Supply of gas to instrument
  2.5 Signals and alarms
  2.6 Times
  2.7 Miscellaneous
3 General requirements
  3.1 Introduction
  3.2 Construction
4 Test methods
  4.1 Introduction
  4.2 General requirements for tests
  4.3 Normal conditions for tests
  4.4 Test methods
5 Field calibration kit
6 Information for use
Annex A (normative) Flammability limits (i.e. LFL and UFL)
                    of some flammable gases and vapours
Annex B (informative) Determination of time of response
Annex C (informative) Bibliography
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

Gives general requirements for the construction and testing and describes the test methods applicable to portable, transportable and fixed apparatus for detecting and measuring flammable gas or vapour concentrations with air. The apparatus, or parts of apparatus are meant for use in potentially explosive atmospheres and in mines susceptible to firedamp. This standard is supplemented by the following standards: IEC 61779-2, IEC 61779-3, IEC 61779-4 and IEC 61779-5.