Electromagnetic compatibility - Electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen

This document specifies requirements for the electromagnetic compatibility (EMC) for electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen which are subject to the performance standards for gas detection apparatus, for example EN 45544 (all parts), EN 50104, EN 50194 (all parts), EN 50291 (all parts), EN 50379 (all parts), EN 50543, EN 50545 1, EN 60079 29 1 or EN 60079 29 4. NOTE For the purpose of this standard, the word ‘toxic’ covers ‘very toxic’, ‘toxic’, ‘harmful’, ‘corrosive‘, ‘irritating‘, ‘sensitizing‘, ‘carcinogenic‘, ‘mutagenic‘ and ‘teratogenic‘. This document applies to apparatus intended for use in residential, commercial and light-industrial environments as well as to apparatus intended for use in industrial environments, and includes AC-, DC- or battery powered apparatus. This document is also applicable to apparatus which is intended for use in hazardous areas which could contain explosive or potentially explosive atmospheres. It covers only normal operation and does not cover safety requirements related to EMC phenomena. This document is a product standard which is based on the product family standard EN 61326 1. prEN 50270:2019 takes precedence over the product family standard and over generic standards. This document applies to electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen that include functions specified by the manufacturer as being safety functions and can include functions specified as not being safety functions. All performance standards for the detection and measurement of combustible gases, toxic gases or oxygen include the minimum requirements for functional safety specified in EN 50271. There are also gas detectors and gas detection systems which are intended to be used with safety integrity levels SIL 1 to SIL 3 according to EN 50402 and EN 61508 (all parts). For functional safety in industrial applications, this document has taken into account those aspects of EN 61326 3 2 relating to the measuring and warning function of the apparatus defined as safety function. This standard specifies requirements for immunity tests in relation to continuous and transient, conducted and radiated disturbances, including electrostatic discharges, and also for emission tests. The test requirements are specified for each port considered. Apparatus falling within the scope of this document are classified as follows by the following types. — Type 1: apparatus intended for use in residential, commercial and light-industrial environments, as described in EN 61000 6 1 and EN 61000 6 3. — Type 2: apparatus intended for use in industrial environments, as described in EN 61000 6 2 and EN 61000 6 4. Type 1 apparatus for which the manufacturer claims a safety integrity level should be considered as type 2 apparatus with regard to immunity requirements. This document does not apply to any of the following: — apparatus intended for the detection of dusts or mists in air; — scientific or laboratory based apparatus used only for analysis or measurement; — apparatus used exclusively for process measurement purposes; — apparatus for medical purposes; — apparatus used for breath alcohol measurement — apparatus intended for the direct measurement of automotive exhaust gases.

Elektromagnetische Verträglichkeit – Elektrische Geräte für die Detektion und Messung von brennbaren Gasen, toxischen Gasen oder Sauerstoff

Compatibilité électromagnétique – Appareils de détection et de mesure de gaz combustible, de gaz toxique et d’oxygène

Elektromagnetna združljivost - Električne naprave za odkrivanje in merjenje vnetljivih in strupenih plinov ali kisika

General Information

Status
Withdrawn
Publication Date
24-Jun-2021
Withdrawal Date
26-Sep-2021
Current Stage
4599 - Dispatch of FV draft to CMC - Finalization for Vote
Start Date
22-Feb-2021
Due Date
30-Sep-2020
Completion Date
22-Feb-2021

Relations

Buy Standard

Draft
prEN 50270:2019
English language
20 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 50270:2019
01-december-2019
Elektromagnetna združljivost - Električne naprave za odkrivanje in merjenje
vnetljivih in strupenih plinov ali kisika

Electromagnetic compatibility - Electrical apparatus for the detection and measurement

of combustible gases, toxic gases or oxygen

Elektromagnetische Verträglichkeit – Elektrische Geräte für die Detektion und Messung

von brennbaren Gasen, toxischen Gasen oder Sauerstoff
Compatibilité électromagnétique – Appareils de détection et de mesure de gaz
combustible, de gaz toxique et d’oxygène
Ta slovenski standard je istoveten z: prEN 50270
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
oSIST prEN 50270:2019 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 50270:2019
---------------------- Page: 2 ----------------------
oSIST prEN 50270:2019
EUROPEAN STANDARD DRAFT
prEN 50270
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2019
ICS 13.320 Will supersede EN 50270:2015 and all of its
amendments and corrigenda (if any)
English Version
Electromagnetic compatibility - Electrical apparatus for the
detection and measurement of combustible gases, toxic gases
or oxygen

Compatibilité électromagnétique - Appareils de détection et Elektromagnetische Verträglichkeit - Elektrische Geräte für

de mesure de gaz combustible, de gaz toxique et die Detektion und Messung von brennbaren Gasen,

d'oxygène toxischen Gasen oder Sauerstoff
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2019-12-20.
It has been drawn up by CLC/TC 31.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
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.

Project: 67360 Ref. No. prEN 50270 E
---------------------- Page: 3 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)
Contents
European foreword 3
1 Scope 4
2 Normative references 5
3 Terms and Definitions 6
4 EMC test plan 8

4.1 General............................................................................................................................................8

4.2 Configuration of the apparatus (EUT) during testing.......................................................................8

4.2.1 General ....................................................................................................................................8

4.2.2 Composition of EUT .................................................................................................................9

4.2.3 Configuration of EUT, operation modes ..................................................................................9

4.2.4 I/O ports ...................................................................................................................................9

4.2.5 Auxiliary equipment ..................................................................................................................9

4.2.6 Cabling and earthing (grounding) ............................................................................................9

4.3 Operation conditions of EUT during testing ....................................................................................9

4.3.1 Test gases, alarm settings .......................................................................................................9

4.3.2 Environmental conditions .......................................................................................................10

4.3.3 EUT software during test .......................................................................................................10

4.4 Test description .............................................................................................................................10

5 Immunity tests 10

5.1 Performance criteria ......................................................................................................................10

5.2 Requirements ................................................................................................................................11

6 Emission tests 11
7 Test report 12
8 Modifications 12

Annex ZA (informative) Relationship between this European standard and the essential requirements of

Directive 2014/30/EU [2014 OJ L96] aimed to be covered 18
Bibliography 19
---------------------- Page: 4 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)
European foreword

This document (prEN 50270:2019) has been prepared by CLC/SC 31-9 “Electrical apparatus for the

detection and measurement of combustible gases to be used in industrial and commercial potentially

explosive atmospheres” of CLC/TC 31, “Electrical apparatus for explosive atmospheres”.

This document is currently submitted to the Enquiry/ Primary Questionnaire.
The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards
(dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)

This document will supersede EN 50270:2015 and all of its amendments and corrigenda (if any).

EN 50270:2018 includes no significant technical changes with respect to EN 50270:2015 + AC/2016.

This document has been prepared under the European Commission standardization request M/552 given

to CENELEC by the European Commission and the European Free Trade Association, and supports

essential requirements of EU Directive 2014/30/EU.

For the relationship with EU Directive 2014/30/EU see informative Annex ZZ, which is an integral part of

this document.
CLC/TC 216 “Gas detectors” contributed to the preparation of the text.
---------------------- Page: 5 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)
1 Scope

This document specifies requirements for the electromagnetic compatibility (EMC) for electrical apparatus

for the detection and measurement of combustible gases, toxic gases or oxygen which are subject to the

performance standards for gas detection apparatus, for example EN 45544 (all parts), EN 50104,

EN 50194 (all parts), EN 50291 (all parts), EN 50379 (all parts), EN 50543, EN 50545-1, EN 60079-29-1

or EN 60079-29-4.

NOTE For the purpose of this standard, the word ‘toxic’ covers ‘very toxic’, ‘toxic’, ‘harmful’, ‘corrosive‘,

‘irritating‘, ‘sensitizing‘, ‘carcinogenic‘, ‘mutagenic‘ and ‘teratogenic‘.

This document applies to apparatus intended for use in residential, commercial and light-industrial

environments as well as to apparatus intended for use in industrial environments, and includes AC-, DC-

or battery powered apparatus.

This document is also applicable to apparatus which is intended for use in hazardous areas which could

contain explosive or potentially explosive atmospheres. It covers only normal operation and does not

cover safety requirements related to EMC phenomena.

This document is a product standard which is based on the product family standard EN 61326-1.

prEN 50270:2019 takes precedence over the product family standard and over generic standards.

This document applies to electrical apparatus for the detection and measurement of combustible gases,

toxic gases or oxygen that include functions specified by the manufacturer as being safety functions and

can include functions specified as not being safety functions.

All performance standards for the detection and measurement of combustible gases, toxic gases or

oxygen include the minimum requirements for functional safety specified in EN 50271. There are also gas

detectors and gas detection systems which are intended to be used with safety integrity levels SIL 1 to

SIL 3 according to EN 50402 and EN 61508 (all parts). For functional safety in industrial applications, this

document has taken into account those aspects of EN 61326-3-2 relating to the measuring and warning

function of the apparatus defined as safety function.

This standard specifies requirements for immunity tests in relation to continuous and transient, conducted

and radiated disturbances, including electrostatic discharges, and also for emission tests. The test

requirements are specified for each port considered.

Apparatus falling within the scope of this document are classified as follows by the following types.

— Type 1: apparatus intended for use in residential, commercial and light-industrial environments, as

described in EN 61000-6-1 and EN 61000-6-3.

— Type 2: apparatus intended for use in industrial environments, as described in EN 61000-6-2 and

EN 61000-6-4.

Type 1 apparatus for which the manufacturer claims a safety integrity level should be considered as type 2

apparatus with regard to immunity requirements.
This document does not apply to any of the following:
— apparatus intended for the detection of dusts or mists in air;

— scientific or laboratory based apparatus used only for analysis or measurement;

— apparatus used exclusively for process measurement purposes;
— apparatus for medical purposes;
— apparatus used for breath alcohol measurement
— apparatus intended for the direct measurement of automotive exhaust gases.
---------------------- Page: 6 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)
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 50291-1:2018, Gas detectors — Electrical apparatus for the detection of carbon monoxide in domestic

premises — Part 1: Test methods and performance requirements

EN 50291-2:2010, Electrical apparatus for the detection of carbon monoxide in domestic premises — Part

2: Electrical apparatus for continuous operation in a fixed installation in recreational vehicles and similar

premises including recreational craft — Additional test methods and performance requirements

EN 50545-1:2011, Electrical apparatus for the detection and measurement of toxic and combustible

gases in car parks and tunnels — Part 1: General performance requirements and test methods for the

detection and measurement of carbon monoxide and nitrogen oxides

EN 61000-4-2:2009, Electromagnetic compatibility (EMC) — Part 4-2: Testing and measurement

techniques — Electrostatic discharge immunity test (IEC 61000-4-2:2008)

EN 61000-4-3:2006, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement

techniques — Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2006)

EN 61000-4-4:2012, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement

techniques — Electrical fast transient/burst immunity test (IEC 61000-4-4:2012)

EN 61000-4-5:2006, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement

techniques — Surge immunity test (IEC 61000-4-5:2005)

EN 61000-4-6:2014, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement

techniques — Immunity to conducted disturbances, induced by radio-frequency fields

(IEC 61000-4-6:2013)

EN 61000-4-8:2010, Electromagnetic compatibility (EMC) — Part 4-8: Testing and measurement

techniques — Power frequency magnetic field immunity test (IEC 61000-4-8:2009)

EN 61000-4-11:2004, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measurement

techniques — Voltage dips, short interruptions and voltage variations immunity tests

(IEC 61000-4-11:2004)

EN 61000-4-29:2000, Electromagnetic compatibility (EMC) — Part 4-29: Testing and measurement

techniques — Voltage dips, short interruptions and voltage variations on d.c. input power port immunity

tests (IEC 61000-4-29:2000)

EN 61000-6-1:2007, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for

residential, commercial and light-industrial environments (IEC 61000-6-1:2005)

EN 61000-6-2:2005, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for

industrial environments (IEC 61000-6-2:2005)
As impacted by EN 50545-1:2011/A1:2016.
As impacted by EN 61000-4-3:2006/A1:2008 and EN 61000-4-3:2006/A2:2010.
As impacted by EN 61000-6-2:2005/AC:2005.
---------------------- Page: 7 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)

EN 61000-6-3:2007, Electromagnetic compatibility (EMC) — Part 6-3: Generic standards — Emission

standard for residential, commercial and light-industrial environments (IEC 61000-6-3:2006)

EN 61000-6-4:2007, Electromagnetic compatibility (EMC) — Part 6-4: Generic standards — Emission

standard for industrial environments (IEC 61000-6-4:2006)

IEC 60050-161, International Electrotechnical Vocabulary — Chapter 161: Electromagnetic compatibility

3 Terms and Definitions

For the purposes of this document, the terms and definitions given in IEC 60050-161 and the following

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
If there are no terms and definitions provided, use the following
3.1
type 1 apparatus

apparatus intended for use in residential, commercial and light-industrial environments, as described in

EN 61000-6-1 and EN 61000-6-3
3.2
type 2 apparatus

apparatus intended for use in industrial environments, as described in EN 61000-6-2 and EN 61000-6-4

3.3
port

particular interface of the specified apparatus with the external electromagnetic environment

Note 1 to entry: See Figure 1.
3.4
enclosure port

physical boundary of the apparatus through which electromagnetic fields may radiate or impinge on

3.5
signal port

port at which a conductor or cable intended to carry signals is connected to the apparatus

Note 1 to entry: Examples are analogue inputs, outputs and control lines; data busses; communication networks,

etc.

Note 2 to entry: Within this document, ports intended to be connected with earth potential for functional reasons

(functional earth ports) are considered as I/O ports.
As impacted by EN 61000-6-3:2007/A1:2011 and EN 61000-6-3:2007/A1:2011/AC:2012.
As impacted by EN 61000-6-4:2007/A1:2011
---------------------- Page: 8 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)
3.6
power port

port at which a conductor or cable carrying the primary electrical power needed for the operation

(functioning) of an apparatus or associated apparatus is connected to the apparatus

3.7
intrinsically safe circuit

circuit in which any spark or any thermal effect produced in the conditions as specified in EN 60079-11,

which include normal operation and specified fault conditions, is not capable of causing ignition of a given

explosive atmosphere
3.8
intrinsically safe port
port connected to an intrinsically safe circuit
3.9
sensor

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

3.10
remote sensor
sensor which is not integral with the main body of the apparatus
3.11
potentially explosive atmosphere
atmosphere which could become explosive
3.12
safety barrier

device for obtaining intrinsic safety of electrical apparatus for potentially explosive atmospheres

[SOURCE: EN 60079-11:2012, 8.6]
3.13
standard test gas

test gas with a composition specified for each apparatus to be used for all tests unless otherwise stated

3.14
measuring function of the apparatus

generation, transmission or output of measured values or status information (e.g. fault, alarm)

3.15
safety function of the apparatus

function to be implemented by electrical apparatus for the detection and measurement of combustible

gases, toxic and oxygen that is intended to achieve or maintain a safe state, in respect of a specific

hazardous event

Note 1 to entry: The measuring and warning function of the apparatus including all associated outputs is always

part of the safety function.
3.16
DC distribution network

local d.c. electricity supply network in the infrastructure of a certain site or building intended for connection

of any type of equipment

Note 1 to entry: Connection to a local or remote battery is not regarded as a DC distribution network if such a link

comprises only the power supply for a single piece of equipment.
[SOURCE: EN 61326-3-2:2008, 3.11]
---------------------- Page: 9 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)
Figure 1 — Examples of ports
3.17
combustible gas

gas or vapour which, when mixed with air in a certain proportion, will form an explosive atmosphere

Note 1 to entry: For the purposes of this standard, the terms “combustible gas” and “flammable gas” are

equivalent.
4 EMC test plan
4.1 General

An EMC test plan shall be established prior to testing. It shall contain, as a minimum, the elements given

in 4.2 to 4.4. It shall also include:
— the type of apparatus (type 1 or 2);
— the specification of the safety function(s);
— the specification of the non-safety function(s);

— the specific pass / fail criteria as defined in Tables 1 to 4 for the relevant functions appropriate to

criteria A, B or C.

It could be determined from consideration of the electrical characteristics and usage of a particular

apparatus that some tests are inappropriate and therefore unnecessary. In such cases, the decision not to

test shall be justified and recorded in the EMC test plan.

The tests shall be carried out as single tests in sequence. The sequence of testing is optional.

4.2 Configuration of the apparatus (EUT) during testing
4.2.1 General

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

within the scope of this standard often consists of systems with no fixed configuration. The kind, number

and installation of different subassemblies within the apparatus may vary from system to system.

For simulating realistic EMC conditions (related both to emissions and immunity), the assembly of the

apparatus shall represent a typical installation as specified by the manufaturer. Such tests shall be carried

out as type tests under normal conditions as specified by the manufacturer in the instruction manual.

External EMC protection devices or measures specified in the instruction manual for the apparatus shall

be used or fitted for the tests.
---------------------- Page: 10 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)
4.2.2 Composition of EUT

All devices, racks, modules, boards, etc. significant to EMC and belonging to the EUT shall be

documented in the test plan. A rationale supporting the configuration of the EUT shall also be provided.

4.2.3 Configuration of EUT, operation modes

If an EUT has a variety of configurations, the type test shall be made with that configuration having the

maximum susceptibility. If necessary, the configuration shall be varied. Each type of module shall be

tested at least once. The rationale for this selection shall be recorded in the EMC test plan. When

designing the most susceptible configuration, possible electromagnetic interaction between modules of

the apparatus shall be taken into consideration.

The manufacturer may elect to perform all tests either on a single EUT or more than one.

The test shall be performed in measuring mode.

For portable battery powered apparatus which can also be operated when connected to an external power

supply, both operational modes (battery powered as well as externally supplied) shall be tested.

If the apparatus has sensors with different measuring principles (e.g. electrochemical sensors or catalytic

sensors) the apparatus shall be tested with each type of sensor. If the apparatus has more than one

measuring range for a particular sensor the most sensitive specified by the manufacturer shall be tested.

If the apparatus is designed for the detection of a variety of gases where the target gas can be changed

by changing the sensor of a given type only (e.g. electrochemical sensors) the sensor with the maximum

EMC-susceptibility shall be tested.

If an apparatus consists of a central unit and additional separate equipment (e.g. remote sensors or

printer), the control unit and the separate equipment may be tested separately if possible.

4.2.4 I/O ports

If the apparatus has a large number of similar ports or ports with similar connections, then a sufficient

number shall be selected to simulate actual operating conditions and to ensure that all the different types

of termination are covered.

Connections between e.g. remote sensors or hand-held terminals with the respective apparatus shall be

considered as I/O lines.

Where there are multiple I/O ports, which are all of the same type, connecting a cable to just one of those

ports is sufficient, provided that it can be shown that the additional cables would not affect the results

significantly.

The rationale for this selection shall be justified and recorded in the EMC test plan.

4.2.5 Auxiliary equipment

When a variety of devices is provided for use with the EUT, at least one of each type of device shall be

selected to simulate actual operating conditions. Auxiliary devices can be simulated.

4.2.6 Cabling and earthing (grounding)

The cables and earth (ground) shall be connected to the EUT in accordance with the manufacturer's

specifications.
4.3 Operation conditions of EUT during testing
4.3.1 Test gases, alarm settings

For linear measuring principles, the tests shall be carried out with the apparatus showing a reading

between 10 % and 90 % of full scale.
---------------------- Page: 11 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)

For nonlinear measuring principles, the tests shall be carried out with the apparatus showing a gas

reading that is likely to represent the worst case conditions for the tests. If the volume fraction of the

standard test gas is not defined an indication between 40 % and 60 % of full scale shall be used.

For apparatus according to EN 50545-1 the calculation of 15 min. averages shall be deactivated.

A test gas having a volume fraction of 75 ppm shall be used for apparatus according to EN 50291-1 or

EN 50291-2. A test gas with a higher volume fraction may be applied prior to the test in order to set the

apparatus into alarm state.

The alarm set points shall be set in such a manner that the alarms are active when test gas is applied. In

doing so, the alarm set points shall be set below or above the volume fraction of the test gas according to

the performance criteria listed in Table 5. For alarm only apparatus or if the alarm set points cannot be set

to these values, the test gas volume fraction shall be chosen accordingly above or below the alarm set

point.

For tests 1.1 to 1.4, 2.1, 3.1 and 4.1 of Tables 1 to 4, the dwell time at each frequency shall be chosen in

such a manner that it does not fall below the update time used for calculating the measured value or the

alarm, respectively. The manufacturer shall specify this update time used for calculation in the EMC test

plan.

NOTE This is particularly valid for apparatus complying with the EN 50291 series or EN 50545-1. The

requirements of these standards to averaging times need not be considered for these tests.

The application of test gas may be simulated (e.g. by inserting an absorbing filter into the optical path of

an infrared sensor). The sensitivity of the apparatus shall not be changed.

If absorbing filters are used to simulate the application of a test gas the test plan shall include a

justification that demonstrates how this arrangement is equivalent to the operating conditions present

when the relevant test gas is used.

Where the test gas is hazardous (combustible or toxic), an alternative test gas may be applied to the

apparatus under test. Where this is done the test plan shall include a rationale that demonstrates how this

is equivalent to the operating conditions present with the hazardous test gas.
4.3.2 Environmental conditions

The tests shall be carried out within the manufacturer's specified environmental operating range (for

example, ambient temperature, humidity, atmospheric pressure), and within the rated ranges of supply

voltage and frequency unless otherwise specified in Table 1 to Table 4.
4.3.3 EUT software during test

That part of the software which is relevant to the measuring function of the apparatus shall be identical

with the production software. Other software modifications are allowed which facilitates EMC testing.

Modifications and justifications for them shall be documented in the EMC test plan.

4.4 Test description

Each test to be applied shall be specified in the EMC test plan. The description of the tests, the test

methods, the characteristics of the tests, and the test set-ups are given in the basic standards which are

referred to in Table 1 to Table 4. Additional information needed for the practical implementation of the

tests is given also in this standard. The contents of the basic standards need not be reproduced in the test

plan.
5 Immunity tests
5.1 Performance criteria

For the functions specified by the manufacturer as being safety functions (see 3.15) the following

hierarchical performance criteria shall apply.
---------------------- Page: 12 ----------------------
oSIST prEN 50270:2019
prEN 50270:2019 (E)

For safety functions the following performance criteria shall be used for the tests in Table 1 to Table 4:

For functions specified by the manufacturer as not being safety functions the allowed performance shall

be that specified by the manufacturer in the instruction manual, unless specified in the Table 1 to Table 4.

Performance criterion A:

The apparatus shall continue to operate as intended both during and after the test.

For those functions specified by the manufacturer as being safety functions, when the apparatus is used

as intended no loss of function is allowed and the performance requirements given in Table 5 shall be

complied with.
Performance criterion B:
During the test

— degradation of performance is allowed but the performance requirements given in Table 5 shall not

be exceeded by more than a factor of 2, or
— the apparatus shall show a specified fault indication and/or output.

After the test any degradation in performance shall be self-recoverable and the apparatus shall continue to

operate as intended. No permanent change of actual operating state or stored data or continuous

deactivation of alarm is allowed.

If the apparatus includes latching alarms or status signals, it is permitted that these may be triggered

during the test. After the test signal has been removed, the latching circuits shall be reset and the correct

operation of the alarm circuit verfied by applying test gas or simulation of signal depending on the type of

apparatus.
Performance criterion C:

Temporary loss of function is allowed during the test, provided the loss of function is self recoverable or

can be easily restored by the operation of the controls. The apparatus shall operate as intended after the

test. No change of stored data are allowed.

If performance criterion C is required in Table 1 to Table 4, the requirements can be presumed to be

fulfilled if the apparatus complies with performance criterion A or B.
5.2 Requirements
Apparatus of type 1 where the manufactur
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.