International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 50104:2010
Title Electrical apparatus for the detection and measurement of oxygen - Performance requirements and test methods
Project Number 21934
Abstract/Scope This European Standard specifies general requirements for construction, testing and performance, and describes the test methods that apply to portable, transportable and fixed apparatus for the measurement of the oxygen concentration in gas mixtures indicating up to 25 % (v/v). The apparatus, or parts thereof, may be intended for use in potentially explosive atmospheres (see 4.1) and in mines susceptible to firedamp. In the case of inert gas purging (inertization), it applies also to apparatus with an oxygen measuring function for explosion protection. NOTE Commonly used oxygen sensors in commercial equipment for industrial application are: a) paramagnetic sensors; b) electrochemical sensors (aqueous and solid electrolytes); c) tunable diode laser absorption spectroscopy sensors (TDLAS). This standard is also applicable when an apparatus manufacturer makes any claims regarding any special features of construction or superior performance that exceed the minimum requirements of this standard. 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 and identified and described in the test report. This European Standard is applicable to oxygen alarm apparatus intended to measure reliably the oxygen concentration, to provide an indication, alarm or other output function, the purpose of which is to give a warning of a potential hazard and, in some cases, to initiate automatic or manual protective action(s), whenever the level exceeds or falls below a preselected alarm concentration. This standard is applicable to apparatus, including integral sampling systems of aspirated apparatus, intended to be used for commercial, industrial and non-residential safety applications. This standard does not apply to external sampling systems, or to apparatus of laboratory or scientific type, or to medical equipment, or to apparatus used only for process control purposes. For apparatus used for sensing the presence of multiple gases, this standard applies only to the measurement of oxygen. This standard is also applicable to apparatus using optical principles (e.g. TDLAS), where the optical transmitter and receiver or the optical transceiver (i.e. combined transmitter and receiver) and a suitable reflector are not located in a common enclosure. However, in this case it will be necessary to modify the test conditions described in Clause 5 and to introduce supplementary tests to Clause 6 of this standard. Such supplementary tests will include alignment, beam block fault, long range operation. Guidance to appropriate modification of the test conditions and supplementary tests may be taken from EN 60079 29 4. Modifications of the test conditions as well as modified and supplementary tests shall be agreed between the manufacturer and test laboratory and identified and described in the test report.


Current Stage code 6060
Current Stage code date 2010-06-04
Current Stage code deadline 2011-06-01
Deadline date for vote 2010-04-30


Directive(s) ATEX (94/9/EC)
Order Voucher  


IEC Technical Body  
Reference Document  
ICS 13.320 - Alarm and warning systems
Keywords Explosive atmosphere; Detection; Oxygen; Performance
Note Supersedes EN 50104:2002 + A1:2004
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2010-06-04 2011-06-01 export to doc file  EN  FR  DE
5099 2010-06-01 2010-10-01  
5061 2010-04-27 2010-06-01  
5060 2010-01-12 2010-02-12 export to doc file  EN
5020 2009-08-07 2010-01-08 export to doc file  EN
3090 2009-05-07 2009-06-21  
1099 2008-09-01 2009-03-01  
1000 2008-02-27 2008-08-31  

Implementation Dates

date of Ratification (DOR) (1) 2010-06-01
date of Availability (DAV) (2) 2010-06-04
date of Announcement (DOA) (3) 2010-12-01
date of Publication (DOP) (4) 2011-06-01
date of Withdrawal (DOW) (5) 2013-06-01


Supersedes EN 50104:2002
EN 50104:2002/A1:2004
Superseded by  
Normative reference (6)  

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.