Electrical equipment for the detection and measurement of oxygen - Performance requirements and test methods

This document specifies general requirements for design, testing and performance, and describes the test methods that apply to portable, transportable and fixed equipment for the measurement of the oxygen concentration in gas mixtures indicating up to 25 % (v/v). The equipment, or parts thereof, may be intended for use in explosive atmospheres (see 4.1) and in mines susceptible to firedamp. This document applies to equipment intended for monitoring oxygen deficiency and enrichment. EXAMPLE Monitoring oxygen deficiency and/or enrichment includes: - protection of human health and safety in potentially oxygen deficient atmospheres; - fire protection by monitoring areas with reduced oxygen concentration; - fire protection by monitoring oxygen concentrations exceeding that of normal ambient air. This document also applies to equipment with an oxygen measuring function for explosion protection in the case of monitoring inertisation. NOTE 1 Inertisation is an explosion protection technique where a potentially explosive atmosphere is purged with inert gas. NOTE 2 Commonly used oxygen sensors in commercial equipment for industrial application are: - electrochemical sensors (aqueous and solid electrolytes); - paramagnetic sensors; - zirconium dioxide sensors; - tunable diode laser absorption spectroscopy sensors (TDLAS). This document is applicable to equipment 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 an alarm set point. This document is applicable to equipment, including integral sampling systems of aspirated equipment, intended to be used for commercial, industrial and non-residential safety applications. This document does not apply to external sampling systems, or to equipment of laboratory or scientific type, or to medical equipment, or to equipment used only for process monitoring and/or control purposes. For equipment used for sensing the presence of multiple gases, this document applies only to the measurement of oxygen. This document is also applicable to equipment 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 5.3 and to introduce supplementary tests to Clause 5.4 of this document. Such supplementary tests will include alignment, beam block fault, long range operation. Guidance to appropriate modification of the test conditions and supplementary tests can be taken from EN 60079 29 4. Modifications of the test conditions as well as modified and supplementary tests are expected to be agreed between the manufacturer and test laboratory and identified and described in the test report.

Elektrische Geräte für die Detektion und Messung von Sauerstoff - Anforderungen an das Betriebsverhalten und Prüfverfahren

Dieses Dokument enthält allgemeine Anforderungen an Bauweise, Prüfung und Betriebsverhalten und beschreibt die Prüfverfahren für tragbare, transportable und ortsfeste elektrische Geräte für die Messung der Sauerstoffkonzentration von Gasgemischen mit einem Messbereich bis zu 25 % (V/V). Die Geräte oder Teile davon können zum Einsatz in explosionsgefährdeten Bereichen (siehe 4.1) und in schlagwettergefährdeten Bergwerken vorgesehen sein. Dieses Dokument gilt für Geräte, die zur Überwachung von Sauerstoffmangel und Sauerstoffüberschuss vorgesehen sind. BEISPIEL Die Überwachung von Sauerstoffmangel und/oder Sauerstoffüberschuss beinhaltet: - Schutz der Gesundheit und Sicherheit von Menschen in möglicherweise sauerstoffarmen Atmosphären; - Brandschutz durch Überwachung von Bereichen mit reduzierter Sauerstoffkonzentration; - Brandschutz durch Überwachung von Sauerstoffkonzentrationen, die die der normalen Umgebungsluft übersteigen. Dieses Dokument gilt auch für Geräte mit einer Sauerstoff-Messfunktion für den Explosionsschutz bei der Überwachung der Inertisierung. ANMERKUNG 1 Inertisierung ist eine Maßnahme des Explosionsschutzes, wenn ein explosionsgefährdeter Bereich mit einem inerten Gas gespült wird. ANMERKUNG 2 Häufig verwendete Sauerstoffsensoren in kommerziellen Geräten für industrielle Anwendungen sind: - elektrochemische Sensoren (wässrige und feste Elektrolyte); - paramagnetische Sensoren; - Zirkondioxid-Sensoren; - durchstimmbare Diodenlaser-Absorptionsspektroskopie-Sensoren (TDLAS). Dieses Dokument ist anwendbar auf Geräte, die zur zuverlässigen Messung der Sauerstoffkonzentration vorgesehen sind und die, wenn der Messwert eine vorgewählte Alarmschwelle über- oder unterschreitet, eine Anzeige, einen Alarm oder ein anderes Ausgangssignal abgeben sollen, um vor einer möglichen Gefahr zu warnen und in einigen Fällen automatische oder manuelle Schutzmaßnahmen auszulösen. Dieses Dokument ist anwendbar auf Geräte, die für kommerzielle, industrielle und gewerbliche Sicherheitsanwendungen verwendet werden sollen, einschließlich der integrierten Entnahmesysteme von Geräten mit Messgasförderung. Dieses Dokument ist nicht anwendbar auf externe Entnahmesysteme, nicht auf Labor- oder wissenschaftliche Geräte, nicht auf medizinische Ausrüstung oder auf Geräte, die nur zur Prozessmessung und -steuerung eingesetzt werden. Bei Geräten zur Detektion mehrerer Gase ist dieses Dokument ausschließlich für die Messung von Sauerstoff anwendbar. Dieses Dokument ist ebenfalls anwendbar auf Geräte, die optische Messverfahren benutzen (z. B. TDLAS), bei denen der optische Sender und Empfänger oder der optische Sender-Empfänger (d. h. kombinierter Sender und Empfänger) und ein geeigneter Reflektor sich nicht in einem gemeinsamen Gehäuse befinden. In diesem Fall wird es jedoch notwendig sein, die in Abschnitt 5.3 beschriebenen Prüfbedingungen abzuwandeln und ergänzende Prüfungen im Abschnitt 5.4 dieser Norm einzuführen. Solche ergänzenden Prüfungen werden Ausrichtung, Störung bei Strahlunterbrechung und Langstreckenbetrieb beinhalten. Anleitungen für geeignete Abwandlungen der Prüfbedingungen und ergänzende Prüfungen können der EN 60079-29-4 entnommen werden. Abwandlungen der Prüfbedingungen sowie veränderte und ergänzende Prüfungen müssen zwischen Hersteller und Prüflabor vereinbart und im Prüfbericht als solche gekennzeichnet und beschrieben werden.

Appareils électriques de détection et de mesure de l'oxygène - Exigences d’aptitude à la fonction et méthodes d’essai

Le présent document spécifie des exigences générales de conception, d’essai et d’aptitude à la fonction et décrit des méthodes d’essai s’appliquant aux matériels portables, transportables et fixes de mesure de la concentration en oxygène dans les mélanges gazeux comportant jusqu’à 25 % (v/v) d’oxygène. Les matériels, ou des parties de ceux-ci, peuvent être prévus pour fonctionner dans des atmosphères explosives (voir 4.1) et dans des mines grisouteuses. Le présent document est applicable aux matériels destinés à surveiller l’appauvrissement ou l’enrichissement en oxygène. EXEMPLE La surveillance de l’appauvrissement et/ou de l’enrichissement en oxygène comprend: - la protection de la santé et de la sécurité des personnes dans des atmosphères potentiellement appauvries en oxygène; - la protection contre l’incendie en surveillant les zones présentant une concentration réduite en oxygène; - la protection contre l’incendie en surveillant les concentrations en oxygène dépassant celle de l’air ambiant normal. Le présent document est également applicable aux matériels disposant d’une fonction de mesure de l’oxygène pour la protection contre l’explosion dans le cas de la surveillance de l’inertage. NOTE 1 L’inertage est une technique de protection contre l’explosion dans laquelle une atmosphère potentiellement explosive est purgée avec du gaz inerte. NOTE 2 Les capteurs d’oxygène communément utilisés dans les matériels disponibles dans le commerce destinés aux applications industrielles sont les suivants: - capteurs électrochimiques (électrolytes liquides et solides), - capteurs paramagnétiques, - capteurs en dioxyde de zirconium, - capteurs de spectroscopie d’absorption par diode laser accordable (TDLAS). Le présent document est applicable aux matériels destinés à mesurer de manière fiable la concentration en oxygène, à fournir une indication, une alarme ou une autre fonction de sortie dans le but d’avertir d’un risque et dans certains cas, de déclencher une ou plusieurs actions automatique(s) ou manuelle(s) de protection dès que le niveau se situe au-dessus ou en dessous d’un point de consigne d’alarme prédéfini. Le présent document est applicable aux matériels, y compris aux systèmes d’échantillonnage intégrés des matériels à aspiration, destinés à des applications de sécurité dans des emplacements commerciaux, industriels et non résidentiels. Le présent document n’est pas applicable aux systèmes d’échantillonnage externes, au matériel de laboratoire scientifique ou médical ni au matériel utilisé uniquement pour le contrôle et/ou la surveillance de processus. Dans le cas des matériels utilisés pour détecter la présence de plusieurs gaz, le présent document n’est applicable qu’au mesurage de l’oxygène. Le présent document est également applicable aux matériels utilisant des principes optiques (par exemple, TDLAS), pour lesquels le transmetteur et le récepteur optiques ou le transmetteur-récepteur (c’est-à-dire le transmetteur et le récepteur combinés) et un réflecteur approprié ne sont pas situés dans une enveloppe commune. Toutefois, dans ce cas, il est nécessaire de modifier les conditions d’essai décrites à l’Article 5.3 et d’introduire des essais supplémentaires à l’Article 5.4 du présent document. Ces essais supplémentaires comprennent l’alignement, le défaut de blocage du faisceau et le fonctionnement longue portée. Des recommandations concernant la modification appropriée des conditions d’essai et les essais supplémentaires sont disponibles dans l’EN 60079 29 4. Il est prévu que la modification des conditions d’essai ainsi que les essais modifiés et supplémentaires soient définis par accord entre le constructeur et le laboratoire d’essai, identifiés et décrits dans le rapport d’essai.

Električne naprave za odkrivanje in merjenje kisika - Zahteve za delovanje in preskusne metode

Ta evropski standard določa splošne zahteve za izdelavo, preskušanje in lastnosti ter opisuje preskusne metode, ki se uporabljajo za prenosne, premične in fiksne aparate za merjenje koncentracije kisika v plinskih zmeseh do 25 % (v/v). Aparati ali njihovi deli so lahko namenjeni za uporabo v potencialno eksplozivnih atmosferah (glej točko 4.1) in rudnikih, izpostavljenih jamskemu eksplozivnemu plinu. V primeru čiščenja (inertizacije) inertnega plina se standard uporablja tudi za aparate s funkcijo merjenja kisika za zaščito pred eksplozijo. OPOMBA: Običajno se v komercialni opremi za industrijsko uporabo uporabljajo naslednji senzorji kisika: a) paramagnetni senzorji; b) elektrokemijski senzorji (z vodnimi in trdnimi elektroliti); c) senzorji z nastavljivo diodo, ki delujejo po principu laserske absorpcijske spektroskopije (TDLAS). Ta standard je uporaben tudi, če proizvajalec aparatov morebiti navaja trditve glede posebnih lastnosti aparatov ali njihovih lastnosti, ki presegajo minimalne zahteve tega standarda. Vse take trditve je treba po potrebi preveriti in potrditi z razširjenimi ali dopolnjenimi preskusnimi postopki. Proizvajalec in preskusni laboratorij se dogovorita o dodatnih preskusih, ki jih opredelita in opišeta v poročilu o preskusu. Ta evropski standard se uporablja za alarmne naprave za zanesljivo merjenje koncentracije kisika, ki z indikatorji, alarmi ali drugimi izhodnimi funkcijami opozarjajo na potencialno nevarnost in v nekaterih primerih sprožijo samodejne ali ročne zaščitne ukrepe, če raven kisika preseže ali pade pod predhodno izbrano koncentracijo, nastavljeno v alarmni napravi. Ta standard se uporablja za aparate, vključno s sistemi vzorčenja kot sestavnimi deli sesalne opreme, namenjene za komercialno, industrijsko in nestanovanjsko varnostno uporabo. Ta standard se ne uporablja za zunanje sisteme vzorčenja, laboratorijske ali znanstvene naprave in medicinske pripomočke ali naprave, ki se uporabljajo samo za namene nadziranja procesov. Pri napravah, ki se uporabljajo za zaznavanje prisotnosti več plinov, se ta standard uporablja le za merjenje kisika. Ta standard se uporablja tudi za naprave, ki delujejo na optičnih principih (npr. TDLAS), pri katerih optični oddajnik in sprejemnik ali optična oddajno-sprejemna naprava (tj. kombinirani oddajnik in sprejemnik) ter ustrezen reflektor nista nameščena v istem ohišju. Vendar bo v tem primeru treba spremeniti preskusne pogoje, opisane v točki 5, in uvesti dodatne preskuse v točko 6 tega standarda. Takšni dodatni preskusi bodo vključevali poravnavo, napako bloka snopa, delovanje dolgega dosega. Navodila za ustrezno spreminjanje preskusnih pogojev in dodatne preskuse se lahko vzame iz standarda EN 60079-29-4. O spremembah preskusnih pogojev ter o spremenjenih oziroma dodatnih preskusih se dogovorita proizvajalec in preskusni laboratorij, ki jih opredelita in opišeta v poročilu o preskusu.

General Information

Status
Published
Publication Date
31-Oct-2019
Current Stage
6060 - Document made available
Due Date
01-Nov-2019
Completion Date
01-Nov-2019

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SLOVENSKI STANDARD
SIST EN 50104:2020
01-februar-2020
Nadomešča:
SIST EN 50104:2010
Električne naprave za odkrivanje in merjenje kisika - Zahteve za delovanje in
preskusne metode
Electrical apparatus for the detection and measurement of oxygen - Performance
requirements and test methods

Elektrische Geräte für die Detektion und Messung von Sauerstoff - Anforderungen an

das Betriebsverhalten und Prüfverfahren

Appareils électriques de détection et de mesure de l'oxygène - Exigences d’aptitude à la

fonction et méthodes d’essai
Ta slovenski standard je istoveten z: EN 50104:2019
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
SIST EN 50104:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50104:2020
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SIST EN 50104:2020
EUROPEAN STANDARD
EN 50104
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2019
ICS 13.320 Supersedes EN 50104:2010 and all of its amendments
and corrigenda (if any)
English Version
Electrical equipment for the detection and measurement of
oxygen - Performance requirements and test methods

Appareils électriques de détection et de mesure de Elektrische Geräte für die Detektion und Messung von

l'oxygène - Exigences d'aptitude à la fonction et méthodes Sauerstoff - Anforderungen an das Betriebsverhalten und

d'essai Prüfverfahren

This European Standard was approved by CENELEC on 2019-08-26. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any

alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50104:2019 E
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SIST EN 50104:2020
EN 50104:2019 (E)
Contents Page

European foreword .................................................................................................................. 4

4.1 Introduction ........................................................................................................... 12

4.2 Design ................................................................................................................... 12

4.2.1 General ..................................................................................................... 12

4.2.2 Indicating devices ...................................................................................... 12

4.2.3 Alarm signals ............................................................................................. 13

4.2.4 Fault signals .............................................................................................. 14

4.2.5 Adjustments ............................................................................................... 14

4.2.6 Battery-powered equipment ........................................................................ 15

4.2.7 Gas detection transmitter for use with separate gas detection control

units .......................................................................................................... 15

4.2.8 Separate gas detection control units for use with gas detection

transmitter(s) ............................................................................................. 15

4.2.9 Equipment using software and/or digital technologies ................................. 15

4.3 Labelling and marking ............................................................................................ 15

4.4 Instruction manual ................................................................................................. 15

5.1 Introduction ........................................................................................................... 18

5.2 General requirements for tests ............................................................................... 18

5.2.1 Samples and sequence of tests .................................................................. 18

5.2.2 Preparation of equipment before testing ..................................................... 19

5.2.3 Mask for calibration and test ...................................................................... 20

5.3 Normal conditions for test ...................................................................................... 20

5.3.1 General ..................................................................................................... 20

5.3.2 Test gas(es) .............................................................................................. 20

5.3.3 Flow rate for test gases .............................................................................. 20

5.3.4 Power supply ............................................................................................. 21

5.3.5 Temperature .............................................................................................. 21

5.3.6 Pressure .................................................................................................... 21

5.3.7 Humidity .................................................................................................... 21

5.3.8 Acclimation time ........................................................................................ 21

5.3.9 Orientation ................................................................................................. 21

5.3.10 Communications options ............................................................................ 21

5.3.11 Gas detection equipment as part of systems .............................................. 21

5.4 Test methods and performance requirements ........................................................ 22

5.4.1 General ..................................................................................................... 22

5.4.2 Unpowered storage .................................................................................... 22

5.4.3 Calibration curve and repeatability ............................................................. 23

5.4.4 Stability ..................................................................................................... 23

5.4.5 Alarm set-point(s) ...................................................................................... 24

5.4.6 Temperature .............................................................................................. 24

5.4.7 Pressure .................................................................................................... 25

5.4.8 Humidity .................................................................................................... 25

5.4.9 Air velocity ................................................................................................. 26

5.4.10 Flow rate ................................................................................................... 26

5.4.11 Orientation ................................................................................................. 26

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SIST EN 50104:2020
EN 50104:2019 (E)

5.4.12 Vibration .................................................................................................... 27

5.4.13 Drop test.................................................................................................... 28

5.4.14 Warm-up time ............................................................................................ 29

5.4.15 Time of response ....................................................................................... 29

5.4.16 Battery capacity ......................................................................................... 29

5.4.17 Power supply variations ............................................................................. 30

5.4.18 Electromagnetic compatibility ..................................................................... 30

5.4.19 Addition of sampling probe ......................................................................... 30

5.4.20 Poisons and other gases ............................................................................ 31

5.4.21 Field calibration kit ..................................................................................... 31

5.4.22 Operation at or below the lower limit of the measuring range ...................... 31

5.4.23 Verification of software and digital components .......................................... 32

Annex A (informative) Significant changes between this edition and EN 50104:2010 ............. 33

Annex ZZ (informative) Relationship between this European standard and the essential

requirements of Directive 2014/34/EU aimed to be covered ............................................. 36

Table ZZ.1 — Correspondence between this European standard and Annex II of Directive

2014/34/EU .................................................................................................................... 36

Bibliography .......................................................................................................................... 37

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SIST EN 50104:2020
EN 50104:2019 (E)
European foreword

This document (EN 50104:2019) has been prepared by CLC/TC 31, “Electrical apparatus for potentially

explosive atmospheres”.
The following dates are fixed:
• latest date by which this document has (dop) 2020-08-26
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2022-08-26
standards conflicting with this document
have to be withdrawn

This document supersedes EN 50104:2010 and all of its amendments and corrigenda (if any).

The State of the Art is included in Annex A “Significant changes between this edition and EN 50104:2010”

which lists all changes to EN 50104:2010.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

This document has been prepared under a mandate given to CENELEC by the European Commission

and the European Free Trade Association and covers essential requirements of EU Directive 2014/34/EU.

For the relationship with EU Directive(s), see informative Annex ZZ, which is an integral part of this

document.
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SIST EN 50104:2020
EN 50104:2019 (E)
1 Scope

This document specifies general requirements for design, testing and performance, and describes the test

methods that apply to portable, transportable and fixed equipment for the measurement of the oxygen

concentration in gas mixtures indicating up to 25 % (v/v). The equipment, or parts thereof, may be

intended for use in explosive atmospheres (see 4.1) and in mines susceptible to firedamp.

This document applies to equipment intended for monitoring oxygen deficiency and enrichment.

EXAMPLE Monitoring oxygen deficiency and/or enrichment includes:

— protection of human health and safety in potentially oxygen deficient atmospheres;

— fire protection by monitoring areas with reduced oxygen concentration;

— fire protection by monitoring oxygen concentrations exceeding that of normal ambient air.

This document also applies to equipment with an oxygen measuring function for explosion protection in

the case of monitoring inertisation.

NOTE 1 Inertisation is an explosion protection technique where a potentially explosive atmosphere is purged with

inert gas.

NOTE 2 Commonly used oxygen sensors in commercial equipment for industrial application are:

— electrochemical sensors (aqueous and solid electrolytes);
— paramagnetic sensors;
— zirconium dioxide sensors;
— tunable diode laser absorption spectroscopy sensors (TDLAS).

This document is applicable to equipment 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 an alarm set point.

This document is applicable to equipment, including integral sampling systems of aspirated equipment,

intended to be used for commercial, industrial and non-residential safety applications.

This document does not apply to external sampling systems, or to equipment of laboratory or scientific

type, or to medical equipment, or to equipment used only for process monitoring and/or control purposes.

For equipment used for sensing the presence of multiple gases, this document applies only to the

measurement of oxygen.

This document is also applicable to equipment 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 5.3 and to introduce supplementary tests to Clause 5.4 of this

document. Such supplementary tests will include alignment, beam block fault, long range operation.

Guidance to appropriate modification of the test conditions and supplementary tests can be taken from

EN 60079-29-4. Modifications of the test conditions as well as modified and supplementary tests are

expected to be agreed between the manufacturer and test laboratory and identified and described in the

test report.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 50270, Electromagnetic compatibility - Electrical apparatus for the detection and measurement of

combustible gases, toxic gases or oxygen
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SIST EN 50104:2020
EN 50104:2019 (E)

EN 50271, Electrical apparatus for the detection and measurement of combustible gases, toxic gases or

oxygen - Requirements and tests for apparatus using software and/or digital technologies

EN 60068-2-6, Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal)

EN 60079-29-2, Explosive atmospheres - Part 29-2: Gas detectors - Selection, installation, use and

maintenance of detectors for flammable gases and oxygen
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Gas properties
3.1.1
ambient air
normal atmosphere surrounding the equipment
3.1.2
poison

substance that lead to temporary or permanent change of performance,

particularly loss of sensitivity of the sensing element
3.1.3
reference air

air, under normal ambient conditions, with an oxygen concentration of (21 ± 0,4) % (v/v)

3.1.4
standard test gas

test gas with a composition specified for each item of equipment to be used for all tests unless otherwise

stated
3.1.5
volume fraction
v/v

quotient of the volume of a specified component and the sum of the volumes of all components of a gas

mixture before mixing, all volumes referring to the pressure and the temperature of the gas mixture

Note 1 to entry: The volume fraction and volume concentration take the same value if, at the same state

conditions, the sum of the component volumes before mixing and the volume of the mixture are equal. However,

because the mixing of two or more gases at the same state conditions is usually accompanied by a slight contraction

or, less frequently, a slight expansion, this is not generally the case.
3.1.6
zero test gas

gas, such as nitrogen, which is free of oxygen, and interfering and contaminating substances

3.2 Types of equipment
3.2.1
alarm-only equipment
equipment with an alarm but not having an indication of measured value
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SIST EN 50104:2020
EN 50104:2019 (E)
3.2.2
aspirated equipment
equipment that samples the gas by drawing it to the gas sensor

Note 1 to entry: A hand operated or electric pump is often used to draw gas to the sensor.

3.2.3
automatically aspirated equipment

aspirated equipment with an integral pump or separate pump, which is connected directly to the

equipment
3.2.4
continuous duty equipment

equipment that is powered for long periods of time, but may have either continuous or intermittent sensing

Note 1 to entry: Within this document, all equipment is regarded as continuous duty.

3.2.5
diffusion equipment

equipment in which the transfer of gas from the atmosphere to the sensor takes place without aspirated

flow
3.2.6
fixed equipment

equipment fastened to a support, or otherwise secured in a specific location when energized

3.2.7
portable equipment
equipment intended to be carried by a person during operation

Note 1 to entry: Portable equipment is battery powered and includes, but is not limited to

a) hand-held equipment, typically less than 1 kg, which requires use of only one hand to operate,

b) personal monitors, similar in size and mass to the hand-held equipment, that are continuously operating (but not

necessarily continuously sensing) while they are attached to the user, and

c) larger equipment that can be operated by the user while it is carried either by hand, by a shoulder strap or carrying

harness and which may or may not have a hand directed probe.
3.2.8
transportable equipment

equipment not intended to be carried by a person during operation, nor intended for fixed installation

3.2.9
gas detection transmitter

fixed gas detection equipment that provide a conditioned electronic signal or output indication to a

generally accepted industry standard (such as 4-20 mA), intended to be utilized with separate gas

detection control units, or signal processing data acquisition, central monitoring and similar systems which

typically process information from various locations and sources including, but not limited to, gas detection

equipment
3.2.10
gas detection control unit

equipment intended to provide indications on a display, alarm functions, output contacts and/or alarm

signal outputs or any combinations when operated with remote sensor(s)
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3.2.11
separate gas detection control unit

equipment intended to provide indications on a display, alarm functions, output contacts and/or alarm

signal outputs or any combination when operated with gas detection transmitter(s)

3.2.12
equipment with integral sensor(s)

equipment that provides indications on a display, alarm functions, output contacts and/or alarm signal

outputs using a sensor which is within or directly mounted to the equipment housing

3.2.13
accessory
component which can be fitted to the equipment for special purpose

EXAMPLE External gas pump, sampling probe, hoses, collecting cone, weather protection device

3.3 Sensors
3.3.1
sensing element
part of the sensor which is sensitive to the gas/vapour to be measured
3.3.2
sensor

assembly in which the sensing element is housed and that may also contain associated circuit

components
3.3.3
integral sensor
sensor which is within or directly assembled to the equipment housing
3.3.4
remote sensor

sensor which is installed separately, but is electrically connected to a gas detection control unit, gas

detection transmitter, or to transportable or portable equipment
3.3.5
measuring principle

type of physical or physico-chemical detection principle and the measurement procedure to determine the

measured value
3.4 Supply of gas to equipment
3.4.1
sample line
means by which the gas being sampled is conveyed to the sensor

Note 1 to entry: Accessories such as filter or water trap are often included in the sample line.

3.4.2
sampling probe
separate accessory sample line which is optionally attached to the equipment

Note 1 to entry: It is usually short (e.g. of the order of 1 m) and rigid, although it can be telescopic. In some cases it

is connected by a flexible tube to the equipment.
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3.4.3
field calibration kit

means of presenting test gas to the equipment for the purpose of calibrating/adjusting or verifying the

operation of the equipment

Note 1 to entry: The field calibration kit can be used for verifying the operation of the alarms if the concentration of

the test gas is beyond the alarm set-point.

Note 2 to entry: A mask for calibration and test (see 3.4.4) is an example of a field calibration kit.

3.4.4
mask for calibration and test

device that can be attached to the equipment to present a test gas to the sensor in a reproducible manner

3.5 Signals and alarms
3.5.1
alarm set point

setting of the equipment at which the measured concentration will cause the equipment to initiate an

indication, alarm or other output function
3.5.2
latching alarm
alarm that, once activated, requires deliberate action to be deactivated
3.5.3
fault signal

audible, visible or other type of output, different from the alarm signal, permitting, directly or indirectly, a

warning or indication that the equipment is not working satisfactorily
3.5.4
repeatability

closeness of agreement between the results of successive measurements of the same measurand,

carried out under the same conditions of measurement, i.e.:
— by the same measurement procedure,
— by the same observer,
— with the same measuring instruments, used under the same conditions,
— in the same laboratory,
— at relatively short intervals of time.
3.5.5
special state

any state of the equipment other than those in which monitoring of gas concentration and/or alarming is

the intent

Note 1 to entry: Special state includes warm-up, calibration mode or fault condition.

3.5.6
measured value
calculated oxygen concentration that results from processing the sensor signal

Note 1 to entry: The measured value may be further processed before indication on output or display (e.g.

suppression of indication).
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3.5.7
indication
representation of the measured value on an output or display

Note 1 to entry: The indication may be affected by suppression or filtering of the measured value.

3.6 Times
3.6.1
drift

variation in the equipment indication with time, at any fixed gas volume fraction under constant ambient

conditions
3.6.2
final indication
indication given by the equipment after stabilisation
3.6.3
stabilisation

state when three successive readings of an equipment at a constant gas volume fraction, taken at 2 min

intervals or twice the respective t(90), whichever is less, indicates no changes greater than ±1 % of the

measuring range
3.6.4
time of response
t(x)

time interval, with the equipment in a warmed-up condition, between the time when an instantaneous

variation in volume fraction is produced at the equipment inlet and the time when the response reaches a

stated percentage (x) of the difference between the initial and the final indication

3.6.5
warm-up time

time interval, with the equipment in a stated atmosphere, between the time when the equipment is

switched on and the time when the indication reaches and remains within the stated tolerances

Note 1 to entry: see Figure 1
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Key
1 Indication
2 Power off in reference air or in zero test gas
3 Power on in reference air or in zero test gas
4 Indication of 20,9 % (v/v) of oxygen or indication of zero test gas
5 Warm-up time
6 Specified tolerance band of indication in reference air or zero test gas
7 Time
Figure 1 — Warm-up time in reference air or in zero test gas (typical)
3.7 Miscellaneous
3.7.1
special tool

tool required to gain access to or, to adjust the equipment controls or required to replace the sensor

Note 1 to entry: The design of the tool is intended to discourage unauthorised interference with the equipment.

3.7.2
calibration

procedure which establishes the relationship between a measured value and the concentration of a test

gas

Note 1 to entry: If the deviation at calibration is too high, usually an adjustment will be carried out subsequently.

3.7.3
adjustment

procedure carried out to minimize the deviation of the measured value from the test gas concentration

Note 1 to entry: When the equipment is adjusted to give an indication of zero in nitrogen, the procedure is called

’zero adjustment’.
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4 General requirements
4.1 Introduction

In addition, parts of the gas detection equipment intended for use in explosive atmospheres shall employ

materials, and should comply with the construction and explosion protection as specified in the

appropriate regulations for explosion protection. The ambient temperature and pressure ranges of such

equipment conforming to this document shall not exceed the ambient temperature and pressure ranges of

the Type(s) of Protection.
4.2 Design
4.2.1 General

Gas detection equipment or parts thereof (e.g. remote sensors) specifically intended for use in the

presence of corrosive vapours or gases shall be constructed of materials known to be resistant to

corrosion by such substances.

The equipment shall be constructed in such a manner that regular functional checks can be easily

undertaken by the user and that it can be equipped with suitable devices for application of test gas (field

calibration kit).

All materials and components used in the construction of the equipment shall be used within the

manufacturer’s ratings or limitations unless otherwise specified by appropriate safety standards.

For aspirated equipment, inlet and outlet ports shall be unambiguously marked to ensure the correct

connection of any sample and exhaust lines.

Any malfunction of outputs from the gas detection equipment not relevant to safety or health shall not

adversely affect the functions of the equipment related to safety.

EXAMPLE Equipment with 4–20mA and Highway Addressable Remote Transducer (HART) Protocol

communication where only the 4–20 mA communication is defined in the instruction manual as related to safety. The

loss of HART communication is not related to safety.
4.2.2 Indicating devices
4.2.2.1 Indicators

Readily distinguishable indicators shall be provided to show that the equipment is energized, in alarm and

in a special state.

Portable equipment shall provide visual and audible indicators for both fault and alarms. The special state

“warm-up” shall be indicated by a visual and/or audible signal. The special states “calibration mode” and

“parameterization mode” shall be indicated by a visual signal.

Transportable or fixed equipment shall provide visual indicators for power, special states and for alarm

states. It is permitted for fixed equipment that the indications related to gas detection transmitters and

remote sensors are shown only at the (separate) gas detection control unit.

If audible indicators are provided for transportable or fixed equipment, alarms are required as a minimum.

If the equipment has more than one measuring range, the range selected shall be clearly identified.

4.2.2.2 Display and other devices for indication of measured values

For equipment with a display to indicate gas concentrations, the gas type, gas concentration and unit of

measurement shall be indicated. It is permissible to mark the gas and unit of measurement adjacent to

the display.

Within the measuring range, the resolution of the display and all other devices for indication of the

measured value shall be at least 1 % of the upper limit of the measuring range or 0,1 % (v/v) of oxygen,

whichever is smaller.
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