IEC 61779-1:1998

FOREWORD
INTRODUCTION
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
      3.3 Labelling and marking
      3.4 Instruction manual
      3.5 Diffusion sensors
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
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

Specifies general requirements for construction and testing and describes the test methods that apply to portable, transportable and fixed apparatus for the detection and measurement of flammable gas or vapour concentrations with air. The apparatus, or parts thereof, are intended for use in potentially explosive atmospheres and in mines susceptible to firedamp.