scope:

This Standard specifies general requirements for construction, testing and performance, and describes the test methods that apply to portable, transportable and fixed equipment for the detection and measurement of flammable gas or vapour concentrations with air.

This Standard is applicable to flammable gas detection equipment which is intended to provide continuous sensing and an indication, alarm or other output function; the purpose of which is to indicate a potential explosion hazard and in some cases, to initiate automatic or manual protective action(s).

This Standard is applicable to equipment intended to be used for commercial, industrial and non-residential safety applications, as well as diffusion equipment and aspirated equipment with integrated sampling systems.

This Standard does not apply to

- external sampling systems;

- equipment intended for use in mines susceptible to firedamp;

- equipment of laboratory or scientific type;

- equipment used only for process monitoring and/or control purposes;

- open path (line of sight) detectors (only equipment with very short optical paths intended for use where the concentration is uniform over the optical path are within the scope of this Standard).

For equipment used for sensing the presence of multiple gases, this Standard applies only to the detection of flammable gas or vapour.

NOTE 1 This Standard is intended to provide for the supply of equipment giving a level of safety and performance suitable for general purpose applications.

NOTE 2 All equipment calibrated on specific gases or vapours can not be expected to correctly indicate on other gases or vapours.

NOTE 3 Indication of measured concentration in % (v/v) or vol ppm can also be available for equipment with a measurement range of over 20 % LEL up to and including 100 % LEL or a measurement range of up to 20 % LEL. One ppm is equal to 10⁻⁶ in volume fraction. In that case, units of measurement might need to be selected upon agreement between the manufacturer and test laboratory when verifying the performance requirements of Annex A.

NOTE 4 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

IEC 60079-29-1:2016 Explosive atmospheres-Part 29-1: Gas detectors- Performance requirements of detectors for flammable gases (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.