NEN EN 50054 : 1998

Foreword
1 Scope
2 Normative references
3 Definitions
4 General requirements
    4.1 Introduction
    4.2 Construction
5 Test requirements
    5.1 Introduction
    5.2 General requirements for tests
    5.3 Normal conditions for test
    5.4 Test methods
6 Field calibration kit
7 Information for use
    7.1 Labelling and marking
    7.2 Instruction manual (see also 7.2r)
Annex A (informative) Flammability limits (i.e. LEL
and UEL) of some flammable gases and vapours
Annex B (informative) Determination of time of response
    B.1 Aspirated apparatus (see also Figure B.1)
    B.2 Apparatus that samples by diffusion
Annex C (informative) Bibliography
Figure 1 Warm-up time in clean air
Figure 2 Warm-up time in standard test gas
Figure B.1 Schematic example of equipment for use with
           aspirated apparatus
Figure B.2 Schematic example of equipment during application
           of clean air or test gas
Figure B.3 Schematic example of equipment showing
           change-over from clean air to test gas to
           begin the time of response measurement
           (see also B.2.2)
Figure B,4 Schematic example of applicator and sensor inlet
           during application of test gas or clean air
           (see also B.2.2)
Figure B.5 An example of an automated test chamber
           (see B.2.3.1)

Describes requirements for construction and testing, and test methods that apply for detection and measurements of combustible gas or vapour concentrations with air. The apparatus designed for use in potentially explosive atmospheres and in mines susceptible to firedamp. The Standard is supplemented by the following Standards, concerning specific requirements for various types of apparatus. Applies to combustible gas detection apparatus which provide an indication, alarm and/or other output function, to give warning of potential explosive hazard and to initiate automatic or manual protective actions.