IEC 61779-1:1998 pdf download – Electrical apparatus for the detectionand measurement of flammable gases -Part 1: General requirements and test methods

IEC 61779-1:1998 pdf download – Electrical apparatus for the detectionand measurement of flammable gases -Part 1: General requirements and test methods.
1.1.1 This part ot IEC 61779 specifies general requirements for construction and testing and describes the test methods that appty to portable. tran5portable 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 (see 2.1.8) and in mines susceptible to firedamp. This standard is supplemented by the following standards, concerning the specific requirements for the performance of the various types of apparatus:
IEC 61779-2: Performance requirements for group I apparatus indicating up to a volume fraction of 5 % methane n a,r
IEC 61779-3: Performance requirements for group I apparatus Indicating up to a volume fraction of 100 % methane in air
IEC 61779-4: Performance requirements for group II apparatus indicating up to a volume fraction of 100 % lower explosive limit
IEC 61779-5: Performance requirements for group II apparatus indicating up to a volume fraction of 100 % gas
NOTE 1 — IEC 61779-1, in association with the standards referred to above. is intended to provide for the supply of apparatus giving a level of safety and performance suitable for general purpose applications. However, tot p.c’t.c applications, a prospective purchaser (or an appropriate auttiontyf may additionally require me apparatus to be submitted to particular teats or approval. For example, group I apparatus i.e. apparatus 10 be used in mines susceptible to firedamp) may not be perrnitled to be used without tine additional, prior epproval of the relevant authority in mines irnde its gurisdiction. Such particular teata.’approval are to be regarded as additional to and separate from th, provisions of the standards reterred to above and do not preclude certification to or compliance with these Standards,
NOTE 2 — Group I and group It apparatus indicating up to a volume fractioc of tOO % methane and group II apparatus iixkcating up to a volume traction of 100% gas are suitable tot use only with the specific gases for which they have been calibrated
NOTE 3-. Foe th. purpose of this standard, the terms lower flammable limit (LFL and ‘lower explosive limit (LELI are deemed to be synonymous, and likewise the terms ‘upper flammable linit (uFLr and upper espfoaive limit fUEL)’ are deemed to be synonymous. For ease 4 reference, the two abbreviations LFL and UFL may be used hereinafter to denote these two sets of terms. II should be recognized that particular authorities having jurisdiction may have overriding requirements that dictate he use of on. of these Sets of terms and not the other,
11.2 This standard is applicable when an apparatus manufacturer makes any claims regarding any special features of construction or superior performance that exceed these minimum requirements. All such claims shall be verified and the test procedures shall be extended or supplemented, where necessary, to verify the claimed performance. The additional tests shall be agreed between the manufacturer and test laboratory.
11.3 This standard is applicable to flammable gas detection apparatus intended to provide an indication, alarm or other output function, the purpose of which is to give a warning of a potential explosion hazard and, in some cases. to initiate automatic or manual protective action(s).
1.2 Normative references
The following normative documents contain provisions which, through reference in this text. constitute provisions of this part of lEG 61779. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61779 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60050(351) :1975, International Electrotechncal Vocabulary (1EV) – Chapter 351:
Automatic control
IEC 60079-0:1983, Electrical apparatus for explosive gas atmospheres — Pan 0: General requirements
IEC 60079-1:1990, Electrical apparatus for explosive gas atmospheres — Part 1: Construction and verification lest of flameproof enclosures of electrical apparatus
IEC 60079-2:1983, Electrical apparatus for explosive gas atmospheres — Part 2: Electrical apparatus — type of protection p
IEC 60079-5:1967, Electrical apparatus for explosive gas atmospheres — Part 5: Sand-filled apparatus
lEG 60079-6:1995, Eleclncal apparatus for exp?osrve gas atmospheres — Part 6: Oil immerson ‘o’.