prEN 54-26

Point fire detectors using carbon monoxide sensors.

This European Standard specifies requirements, test methods and performance criteria for point fire detectors using carbon monoxide sensing for use in fire detection and fire alarm systems for buildings (see EN 54 1).
This standard does not cover fire detectors incorporating at least one CO sensing element in combination with other elements sensing different fire phenomena.

Brandmeldeanlagen - Teil 26: Punktförmige Melder mit Kohlenmonoxidsensoren

Diese Europäische Norm legt Anforderungen, Prüfverfahren und Leistungsmerkmale für punktförmige Brandmelder fest, die Kohlenmonoxid erkennen und die in Brandmeldeanlagen für Gebäude eingesetzt werden (siehe EN 54 1).
Brandmelder, die neben mindestens einen CO Sensor in Kombination andere Sensoren zum Erkennen unterschiedlicher Brandkenngrößen beinhalten, sind nicht Gegenstand dieser Norm.
CO Brandmelder mit speziellen Merkmalen, entwickelt  für besondere Risiken, sind nicht Gegenstand dieser Norm.

Système de détection et d'alarme incendie - Partie 26: Détecteurs ponctuels d'incendie utilisant des capteurs de monoxyde de carbone

La présente Norme européenne spécifie les exigences, les méthodes d'essais et les critères de performance des détecteurs ponctuels d’incendie fonctionnant suivant le principe de la détection de monoxyde de carbone utilisés dans les systèmes de détection et d'alarme incendie installés dans les bâtiments (voir l’EN 54-1).
La présente norme ne prend pas en compte les détecteurs d’incendie qui combinent au moins un élément de détection de CO avec d’autres éléments de détection de différents phénomènes d’incendie.
Les détecteurs d’incendie de CO possédant des caractéristiques particulières et conçus pour des risques spécifiques ne sont pas pris en compte dans la présente norme.

Sistemi za odkrivanje in javljanje požara ter alarmiranje - 26. del: Točkovni javljalniki požara s senzorji ogljikovega monoksida

General Information

• Status: Not Published
• ICS: 13.220.20 - Fire protection
• Technical Committee: CEN/TC 72 - Fire detection and fire alarm systems
• Drafting Committee: CEN/TC 72/WG 20 - CO detectors
• Current Stage: 3098 - Decision to reject - Consensus building
• Start Date: 09-Sep-2011
• Completion Date: 09-Sep-2011
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/109 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on fire alarm/detection, fixed firefighting, fire and smoke control and explosion suppression products
• Ref Project: oSIST prEN 54-26:2008 - Fire detection and fire alarm systems - Part 26: Point fire detectors using carbon monoxide sensors

Overview

prEN 54-26 is the CEN draft European Standard that specifies requirements, test methods and performance criteria for point fire detectors using carbon monoxide (CO) sensors for use in building fire detection and fire alarm systems (see EN 54-1). The standard is intended to verify detector behaviour in service environments and to confirm reliable response to smouldering fires. It excludes detectors that combine a CO sensing element with other types of sensing elements and detectors developed for very specific risks.

CO detectors detect combustion products that diffuse as well as convect, making them particularly useful for early detection of smouldering, low-flame or pyrolysis-type fires where smoke detectors may be affected by dust, steam or cooking vapours.

Key Topics

• Scope & exclusions: Applies to point CO detectors for building systems; not applicable to combined-phenomenon detectors or special-risk CO detectors.
• Performance requirements: Devices must meet specified requirements verified by inspection, engineering assessment and the test programme defined in Clause 5.
• Visual indication: Each detector shall provide an integral red visual indicator that remains visible (identifying the alarmed detector) from 6 m directly below the detector under up to 500 lux ambient light.
• Detachable detector monitoring: Detachable heads must provide means for remote monitoring to detect removal from the base and signal a fault.
• Access control: Manufacturer settings shall not be changeable except by special means or by breaking a seal; on-site adjustment is permitted only where documented and secured.
• Cross-sensitivity and environment: The standard requires tests for cross-sensitivity to gases and substances normally present in service environments and includes climatic, mechanical and EMC tests to confirm robustness.
• Fire tests: Focus is on smouldering fire performance: fire test types TF2 and TF3 (from EN 54-7) are included and adapted to monitor CO during tests.

Applications

• Early detection of smouldering fires in enclosed spaces where smoke sensors are prone to false alarms (e.g., storage, certain industrial areas, kitchens with frequent steam/dust exposure).
• Integration into building fire alarm systems requiring compliance with EN 54 series requirements and demonstrable performance for CO-based detection.

Related Standards

• EN 54-1: Introduction to Fire Detection and Fire Alarm Systems
• EN 54-7: Smoke Detectors - point detectors using scattered/transmitted light or ionisation (TF2/TF3 test fires referenced)
• EN 50130-4: EMC immunity requirements for alarm system components
• Relevant EN/ISO standards for environmental and durability testing (e.g., EN 60068 series)

For designers, specifiers and manufacturers, prEN 54-26 provides the framework to validate CO point detector performance, reduce unwanted alarms, and ensure suitability for smouldering fire detection in building fire alarm installations.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2008
6LVWHPL]DRGNULYDQMHLQMDYOMDQMHSRåDUDWHUDODUPLUDQMHGHO7RþNRYQL
MDYOMDOQLNLSRåDUDVVHQ]RUMLRJOMLNRYHJDPRQRNVLGD
Fire detection and fire alarm systems - Part 26: Point fire detectors using carbon
monoxide sensors
Brandmeldeanlagen - Teil 26: Punktförmige Melder mit Kohlenmonoxidsensoren
Système de détection et d'alarme incendie - Partie 26: Détecteurs ponctuels d'incendie
utilisant des capteurs de monoxyde de carbone
Ta slovenski standard je istoveten z: prEN 54-26
ICS:
13.220.20 3RåDUQD]DãþLWD Fire protection
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 13.220.20
English Version
Fire detection and fire alarm systems - Part 26: Point fire
detectors using carbon monoxide sensors
Système de détection et d'alarme incendie - Partie 26: Brandmeldeanlagen - Teil 26: Punktförmige Melder mit
Détecteurs ponctuels d'incendie utilisant des capteurs de Kohlenmonoxidsensoren
monoxyde de carbone
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 72.
If this draft becomes a European Standard, CEN 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 CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 54-26:2008: E
worldwide for CEN national Members.

Contents Page
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Requirements.6
4.1 Compliance.6
4.2 Individual alarm indication .6
4.3 Connection of ancillary devices.6
4.4 Monitoring of detachable detectors.6
4.5 Manufacturer's adjustments.6
4.6 On-site adjustment of response behaviour .7
4.7 Rate-sensitive CO response .7
4.8 Marking .7
4.9 Data .8
4.10 Additional requirements for software controlled detectors.8
5 Test methods.9
5.1 General.9
5.2 Repeatability.13
5.3 Directional dependence .13
5.4 Reproducibility.14
5.5 Long term stability.14
5.6 Variation in supply parameters .15
5.7 Air movement.15
5.8 Dry heat (operational).15
5.9 Dry heat (endurance).16
5.10 Cold (operational) .17
5.11 Damp heat, cyclic (operational).18
5.12 Damp heat, steady state (operational).19
5.13 Damp heat, steady state (endurance).20
5.14 Low humidity, steady state (operational).21
5.15 Sulphur dioxide SO2 corrosion (endurance) .22
5.16 Shock (operational) .23
5.17 Impact (operational).24
5.18 Vibration, sinusoidal, (operational).25
5.19 Vibration, sinusoidal (endurance).26
5.20 Exposure to chemical agents at environmental concentrations .27
5.21 Exposure to high level of carbon monoxide.28
5.22 Electromagnetic Compatibility (EMC), Immunity tests (operational).29
5.23 Fire sensitivity.29
Annex A (normative) Gas test chamber for response threshold value and cross-sensitivity.32
Annex B (normative) CO and smoke measuring instruments.33
Annex C (normative) Fire test room.34
Annex D (normative) Smouldering (pyrolysis) wood fire (TF2).36
Annex E (normative) Glowing smouldering cotton fire (TF3).39
Annex F (informative) Information concerning the construction of the gas test chamber .42
Annex G (informative) Apparatus for impact test .44
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive (89/106/EEC).46

Foreword
This document (prEN 54-26:2008) has been prepared by Technical Committee CEN/TC 72 “Fire detection
and fire alarm systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
EN 54 "Fire detection and fire alarm systems": consists of the following parts:
Part 1: Introduction
Part 2: Control and indicating equipment
Part 3: Fire alarm devices – Sounders
Part 4: Power supply equipment
Part 5: Heat detectors – Point detectors
Part 7: Smoke detectors – Point detectors using scattered light, transmitted light or ionization
Part 10: Flame detector – Point detectors
Part 11: Manual call points
Part 12: Smoke detectors – Line detector using an optical light beam
Part 13: Compatibility assessment of system components
Part 14: Guidelines for planning, design, installation, commissioning, use and maintenance
Part 15: Point detectors using a combination of detected phenomena
Part 16: Voice alarm control and indicating equipment
Part 17: Short circuit isolators
Part 18: Input/output devices
Part 20: Aspirating smoke detectors
Part 21: Alarm transmission and fault warning routine equipment
Part 22: Line-type heat detectors (in preparation)
Part 23: Fire alarm devices – Visual alarms (in preparation)
Part 24: Components of voice alarm systems – Loudspeakers
Part 25: Components using radio links and system requirements
Part 26: Point fire detectors using carbon monoxide sensors (in preparation)
Part 27: Duct smoke detectors (in preparation)
According to the CEN/CENELEC Internal Regulation, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, and
United Kingdom.
Introduction
Carbon monoxide (CO) is a product of the incomplete combustion of carbon-based materials. CO fire
detectors can react promptly to smouldering fires involving carbonaceous materials because CO does not
depend solely on convection, but also moves by diffusion. CO fire detectors might be better suited to
applications where other fire detection techniques are prone to false alarms, i.e. due to dust, steam and
cooking vapours.
A number of different methods for sensing CO are suitable. However, most sensors will also be influenced by
other gases and phenomena. Tests have therefore been included in the test schedule to assess cross-
sensitivity to substances normally present in the service environment that may affect the performance of the
detector.
As CO detectors are specifically well suited for the detection of incipient fires rather than flaming fires this
standard only includes tests to verify performance in smouldering fires. For this purpose, test fires TF2 and
TF3 from EN 54-7 have been included in the test schedule. These have been modified to include monitoring
of the CO level during the test.
1 Scope
This European Standard specifies requirements, test methods and performance criteria for point fire detectors
using carbon monoxide sensing for use in fire detection and fire alarm systems for buildings (see EN 54-1).
This standard does not cover fire detectors incorporating at least one CO sensing element in combination with
other elements sensing different fire phenomena.
CO fire detectors with special characteristics and developed for specific risks are not covered by this standard.
2 Normative references
The following referenced documents are indispensable for the application 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 54-1:1996, Fire detection and fire alarm systems — Part 1: Introduction
EN 54-7:2000, Fire detection and fire alarm systems — Part 7: Smoke detectors — Point detectors using
scattered light, transmitted light or ionization
EN 54-7:2000/A1:2002, Fire detection and fire alarm systems — Part 7: Smoke detectors — Point detectors
using scattered light, transmitted light or ionization
EN 54-7:2000/A2:2006, Fire detection and fire alarm systems — Part 7: Smoke detectors — Point detectors
using scattered light, transmitted light or ionization
EN 50130-4:1995, Alarm systems — Part 4: Electromagnetic compatibility — Product family standard:
immunity requirements for components of fire, intruder and social alarm systems
EN 50130-4:1995/A1:1998, Alarm systems — Part 4: Electromagnetic compatibility — Product family
standard: immunity requirements for components of fire, intruder and social alarm systems
EN 50130-4:1995/A2:2003, Alarm systems — Part 4: Electromagnetic compatibility — Product family
standard: immunity requirements for components of fire, intruder and social alarm systems
EN 60068-1:1994, Environmental testing — Part 1: General and guidance
EN 60068-2-1:1993, Environmental testing — Part 2-1: Tests; Test A: Cold
EN 60068-2-1:1993/A1:1993, Environmental testing — Part 2-1: Tests; Test A: Cold
EN 60068-2-1:1993/A2:1994, Environmental testing — Part 2-1: Tests; Test A: Cold
EN 60068-2-2:1993, Environmental testing — Part 2-2: Tests; Tests B; Dry heat
EN 60068-2-2:1993/A1:1993, Environmental testing — Part 2-2: Tests; Tests B; Dry heat
EN 60068-2-6:1995, Environmental testing — Part 2-6: Tests — Test Fc: Vibration
EN 60068-2-27:1993, Environmental testing, Test methods, Environmental testing procedures — Part 2-
27: Tests; Test Ea & Guidance: Shock
EN 60068-2-30:2005, Environmental testing — Part 2–30: Tests; Test Db: Damp heat, cyclic (12+12 hour
cycle)
EN 60068-2-42:2003, Environmental testing, Test methods — Part 2-42: Tests; Test Kc: Sulphur dioxide test
for contacts and connections
EN 60068-56:1988, Environmental testing — Part 2: Tests — Test Cb: Damp heat steady state, primarily for
equipment
EN 60068-2-75:1997, Environmental testing — Part 2-75: Tests — Test Eh: Hammer
EN 60068-2-78:2001, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state
EN ISO 9001:2000, Quality management systems – Requirements (ISO 9001:2000)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply / the terms and definitions given
in EN 54-1: 1996 and the following apply.
3.1
CO response threshold value
CO concentration in the proximity of the specimen at the moment that it generates an alarm signal, when
tested as described in 5.1.5
NOTE The response threshold value may depend on signal processing in the detector and in the control and
indicating equipment
3.2
rate-sensitive
behaviour of a detector that depends on the rate of change of CO concentration
4 Requirements
4.1 Compliance
In order to comply with this standard, the detector shall meet the requirements of this clause, which shall be
verified by visual inspection or engineering assessment, shall be tested as described in Clause 5 and shall
meet the requirements of the tests.
4.2 Individual alarm indication
Each detector shall be provided with an integral red visual indicator, by which the individual detector that
released an alarm, can be identified, until the alarm condition is reset. Where other conditions of the detector
can be visually indicated, they shall be clearly distinguishable from the alarm indication, except when the
detector is switched into a service mode. For detachable detectors, the indicator may be integral with the base
or the detector head. The visual indicator shall be visible from a distance of 6 m directly below the detector, in
an ambient light intensity up to 500 lux.
4.3 Connection of ancillary devices
Where the detector provides for connections to ancillary devices (e.g. remote indicators, control relays),
open- or short-circuit failures of these connections shall not prevent the correct operation of the detector.
4.4 Monitoring of detachable detectors
For detachable detectors, a means shall be provided for a remote monitoring system (e.g. the control and
indicating equipment) to detect the removal of the head from the base, in order to give a fault signal.
4.5 Manufacturer's adjustments
It shall not be possible to change the manufacturer's settings except by special means (e.g. the use of a
special code or tool) or by breaking or removing a seal.
4.6 On-site adjustment of response behaviour
If there is provision for on-site adjustment of the response behaviour of the detector then:
a) for each setting at which the manufacturer claims compliance with this standard, the detector shall comply
with the requirements of this standard, and access to the adjustment means shall only be possible by the
use of a code or special tool or by removing the detector from its base or mounting;
b) any setting(s) at which the manufacturer does not claim compliance with this standard, shall only be
accessible by the use of a code or special tool, and it shall be clearly marked on the detector or in the
associated data, that if these setting(s) are used, the detector does not comply with the standard.
NOTE These adjustments may be carried out at the detector or at the control and indicating equipment.
4.7 Rate-sensitive CO response
The CO response threshold value of the detector may depend on the rate of change of CO concentration in
the vicinity of the detector. Such behaviour may be incorporated in the detector design to improve the
discrimination between ambient CO levels and those generated by a fire. If such rate sensitive behaviour is
included then it shall not lead to a significant reduction in the detector’s sensitivity to fires, nor to a significant
increase in the probability of false alarm.
Since it is not practical to make tests with all possible rates of increase in CO concentration, an assessment of
the detector's rate sensitivity shall be made by analysis of the circuit/software, and/or physical tests and
simulations.
The detector shall be deemed to meet the requirements of this clause if this assessment shows that:
a) for any rate of increase in CO concentration less than 1 µl/l per minute the detector will signal an alarm
condition before the CO concentration reaches 60 µl/l, and;
b) the detector does not signal an alarm condition when subjected to a step change in CO concentration of
10 µl/l, superimposed on a background level between 0 and 1,5 µl/l.
4.8 Marking
Each detector shall be clearly marked with the following information:
a) the number of this standard (i.e. EN 54-26);
b) the name or trademark of the manufacturer or supplier;
c) the model designation (type or number);
d) the wiring terminal designations;
e) some mark(s) or code(s) (e.g. serial number or batch code), by which the manufacturer can identify, at
least, the date or batch and place of manufacture, and the version number(s) of any software, contained
within the detector.
For detachable detectors, the detector head shall be marked with a), b), c) and e), and the base shall be
marked with, at least c) (i.e. its own model designation) and d).
Where any marking on the device uses symbols or abbreviations not in common use then these shall be
explained in the data supplied with the device.
The marking shall be visible during installation of the detector and shall be accessible during maintenance.
The marking shall not be placed on screws or other easily removable parts.
4.9 Data
Detectors shall either be supplied with sufficient technical, installation and maintenance data to enable their
1)
correct installation and operation or, if all of this data is not supplied with each detector, reference to the
appropriate data sheet shall be given on, or with each detector.
NOTE Additional information may be required by organisations certifying that detectors produced by a manufacturer
conform to the requirements of this standard.
4.10 Additional requirements for software controlled detectors
4.10.1 General
For detectors which rely on software control in order to fulfil the requirements of this standard, the
requirements of 4.10.2, 4.10.3 and 4.10.4 shall be met.
4.10.2 Software documentation
4.10.2.1 Design overview
The manufacturer shall submit documentation which gives an overview of the software design. This
documentation shall be in sufficient detail for the design to be inspected for compliance with this standard and
shall include at least the following:
a) a functional description of the main program flow (e.g. as a flow diagram or structogram) including:
1) a brief description of the modules and the functions that they perform;
2) the way in which the modules interact;
3) the overall hierarchy of the program;
4) the way in which the software interacts with the hardware of the detector;
5) the way in which the modules are called, including any interrupt processing.
b) a description of which areas of memory are used for the various purposes (e.g. the program, site specific
data and running data);
c) a designation, by which the software and its version can be uniquely identified.
4.10.3 Design detail
The manufacturer shall have available detailed design documentation, which only needs to be provided if
required by the testing authority. It shall comprise at least the following:
a) an overview of the whole system configuration, including all software and hardware components;
b) a description of each module of the program, containing at least:
1) the name of the module;
1)
To enable correct operation of the detectors, this data should describe the requirements for the correct processing of the
signals from the detector. This may be in the form of a full technical specification of these signals, a reference to the

appropriate signalling protocol or a reference to suitable types of control and indicating equipment etc.
2) a description of the tasks performed;
3) a description of the interfaces, including the type of data transfer, the valid data range and the
checking for valid data.
c) full source code listings, as hard copy or in machine-readable form (e.g. ASCII-code), including all global
and local variables, constants and labels used, and sufficient comment for the program flow to be
recognized;
d) details of any software tools used in the design and implementation phase (e.g. CASE-tools, compilers).
4.10.4 Software design
In order to ensure the reliability of the detector, the following requirements for software design shall apply:
a) the software shall have a modular structure;
b) the design of the interfaces for manually and automatically generated data shall not permit invalid data to
cause error in the program operation;
c) the software shall be designed to avoid the occurrence of deadlock of the program flow.
4.10.5 The storage of programs and data
The program necessary to comply with this standard and any pre-set data, such as manufacturer's settings,
shall be held in non-volatile memory. Writing to areas of memory containing this program and data shall only
be possible by the use of some special tool or code and shall not be possible during normal operation of the
detector.
Site-specific data shall be held in memory which will retain data for at least two weeks without external power
to the detector, unless provision is made for the automatic renewal of such data, following loss of power,
within 1 h of power being restored.
5 Test methods
5.1 General
5.1.1 Atmospheric conditions for tests
Unless otherwise stated in a test procedure, the testing shall be carried out after the test specimen has been
allowed to stabilize in the standard atmospheric conditions for testing as described in
IEC 60068-1:1988+A1:1992 as follows:
 temperature: (15 to 35) °C;
 relative humidity: (25 to 75) %;
 air pressure: (86 to 106) kPa.
NOTE If variations in these parameters have a significant effect on a measurement, then such variations should be
kept to a minimum during a series of measurements carried out as part of one test on one specimen.
5.1.2 Operating conditions for tests
If a test method requires a specimen to be operational, then the specimen shall be connected to suitable
supply and monitoring equipment with characteristics as required by the manufacturer's data. Unless
otherwise specified in the test method, the supply parameters applied to the specimen shall be set within the
manufacturer's specified range(s) and shall remain substantially constant throughout the tests. The value
chosen for each parameter shall normally be the nominal value, or the mean of the specified range. If a test
procedure requires a specimen to be monitored to detect any alarm or fault signals, then connections shall be
made to any necessary ancillary devices (e.g. through wiring to an end-of-line device for conventional
detectors) to allow a fault signal to be recognised.
NOTE The details of the supply and monitoring equipment and the alarm criteria used should be given in the test
report.
5.1.3 Mounting arrangements
The specimen shall be mounted by its normal means of attachment and in its normal orientation in
accordance with the manufacturer's instructions. If these instructions describe more than one method of
mounting, or more than one acceptable orientation, then the method considered to be most unfavourable shall
be chosen for each test.
5.1.4 Tolerances
Unless otherwise stated, the tolerances for the environmental test parameters shall be as given in the basic
reference standards for the test (e.g. the relevant part of IEC 60068).
If a requirement or test procedure does not specify a tolerance or deviation limits, then deviation limits of
± 5 % shall be applied.
5.1.5 Measurement of CO response threshold value
The specimen, for which the CO response threshold value is to be measured, shall be installed in the gas test
chamber, described in Annex A, in its normal operating position, by its normal means of attachment. The
orientation of the specimen, relative to the direction of airflow, shall be the least sensitive orientation, as
determined in the directional dependence test, unless otherwise specified in the test procedure.
Before commencing each measurement, the gas test chamber shall be purged to ensure that the
concentration of CO in the tunnel is less than 1,5 µl/l.
The air velocity in the proximity of the specimen shall be (0,2 ± 0,04) m/s during the measurement, unless
otherwise specified in the test procedure.
Unless otherwise specified in the test procedure, the air temperature in the gas test chamber shall be
(23 ± 5)°C and shall not vary by more than 5 K for all the measurements on a particular detector type.
The specimen shall be connected to its supply and monitoring equipment as described in 5.1.2, and shall be
allowed to stabilise for a period of at least 15 min, unless otherwise specified by the manufacturer.
CO shall be introduced into the gas test chamber such that the rate of increase of CO concentration is
between 1 µl/l per minute and 6 µl/l per minute, unless otherwise specified in the test procedure. For detectors
with a rate sensitive behaviour, the manufacturer may specify a rate of increase within this range to ensure
that the measured CO response threshold value is representative of the static CO response threshold value of
the detector.
The rate of increase in CO concentration shall be similar for all measurements on a particular detector type.
The CO concentration at the moment that the specimen gives an alarm shall be recorded as S (µl/l). This shall
be taken as the CO response threshold value.
5.1.6 Provision for tests
The following shall be provided for testing compliance with this standard:
a) for detachable detectors; twenty five detector heads and bases; for non-detachable detectors; twenty five
specimens.
b) The data required in 4.9.
NOTE 1 Detachable detectors comprise at least two parts; a base (socket) and a head (body). If the specimens are
detachable detectors, then the two, or more, parts together are regarded as a complete detector.
The specimens submitted shall be deemed representative of the manufacturer's normal production with
regard to their construction and calibration.
NOTE 2 This implies that the mean response threshold value of the twenty seven specimens found in the
reproducibility test, 5.4, should also represent the production mean, and that the limits specified in the reproducibility test
should also be applicable to the manufacturer's production.
5.1.7 Test schedule
The specimens shall be tested according to the following test schedule (see Table 1). After the reproducibility
test, the four least sensitive specimens (i.e. those with the highest response thresholds) shall be numbered 22
to 25, and the others shall be numbered 1 to 21 arbitrarily.
Table 1 — Test schedule
Test Clause Specimen No(s)
Repeatability 5.2 one chosen arbitrarily
Directional dependence 5.3 one chosen arbitrarily
Reproducibility 5.4 all specimens
Long term stability 5.5 1
Variation in supply parameters 5.6 2
Air movement 5.7 3
Dry heat (operational) 5.8 4
Dry heat (endurance) 5.9 5
Cold (operational) 5.10 6
Damp heat, cyclic (operational) 5.11 7
Damp heat, steady state (operational) 5.12 8
Damp heat, steady state (endurance) 5.13 9
Low humidity steady state (operational) 5.14 10
Sulphur dioxide SO corrosion (endurance) 5.15 11
Shock (operational) 5.16 12
Impact (operational) 5.17 13
Vibration, sinusoidal (operational) 5.18 14
Vibration, sinusoidal (endurance) 5.19 14
Exposure to chemical agents at environmental concentrations 5.20 15
Exposure to high levels of carbon monoxide 5.21 16
Error! Reference source not found. 5.22

a
 Electrostatic discharge (operational) 17
a
 Radiated electromagnetic fields (operational)
a
 Conducted disturbances induced by electromagnetic fields

(operational)
a
 Fast transient bursts (operational)
a
 Slow high energy voltage surge (operational)
Fire sensitivity 5.23 22, 23, 24, 25
a
In the interests of test economy, it is permitted to use the same specimen for more than one EMC test. In
that case, intermediate functional test(s) on the specimen(s) used for more than one test can be deleted,
and the functional test conducted at the end of the sequence of tests. However it should be noted that in the
event of a failure, it may not be possible to identify which test exposure caused the failure (see Clause 4 of
EN 50130-4:1995 as amended by EN 54130-4:1995/A1:1998 and EN 54130-4:1995/A2:2003).

5.2 Repeatability
5.2.1 Object
To show that the detector has stable behaviour with respect to its sensitivity even after a number of alarm
conditions.
5.2.2 Test procedure
The response threshold value of the specimen to be tested shall be measured as described in 5.1.5 six times.
The specimen's orientation relative to the direction of airflow is arbitrary, but it shall be the same for all six
measurements.
The maximum response threshold value shall be designated S , the minimum value shall be designated S .
max min
5.2.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
a) the ratio of the response threshold values S : S shall be not greater than 1,6; and
max min
b) the lower response threshold value S shall be not less than 25 µl/l.
min
5.3 Directional dependence
5.3.1 Object
To confirm that the sensitivity of the detector is not unduly dependent on the direction of airflow around the
detector.
5.3.2 Test procedure
The response threshold value of the specimen to be tested shall be measured eight times as described in
5.1.5, the specimen being rotated 45º about its vertical axis between each measurement, so that the
measurements are taken for eight different orientations relative to the direction of air flow.
The maximum response threshold value shall be designated S , the minimum value shall be designated S
max min
The orientations, for which the maximum and minimum response threshold values were measured, shall be
noted.
In the following tests the orientation for which the maximum response threshold was measured is referred to
as the least sensitive orientation, and the orientation for which the minimum response threshold was
measured is referred to as the most sensitive orientation.
5.3.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
a) the ratio of the response threshold values S : S shall not be greater than 1,6; and
max min
b) the lower response threshold value S shall not be less than 25 µl/l.
min
5.4 Reproducibility
5.4.1 Object
To show that the sensitivity of the detector does not vary unduly from specimen to specimen and to
establish response threshold value data for comparison with the response threshold values measured after
the environmental tests.
5.4.2 Test procedure
The response threshold value of each of the test specimens shall be measured as described in 5.1.5.
The mean of these response threshold values shall be calculated and shall be designated .
S
The maximum response threshold value shall be designated S and the minimum value shall be designated
max
S .
min
5.4.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
a) the ratio of the response threshold values S : S shall not be greater than 1,33 and the ratio of the
max
response threshold values : S shall not be greater than 1,5.
S
min
b) the minimum response threshold value S shall not be less than 25 µl/l.
min
5.5 Long term stability
5.5.1 Object
To confirm that the detectors are stable over long periods of time.
5.5.2 Test procedure
Connect the detector to suitable supply and monitoring equipment and place it in an environment free of CO
and atmospheric contaminants. Measure the response threshold value, as described in 5.1.5, at 28 days, 56
days and 84 days from the start of the test. Designate the highest of the values measured in this test and that
measured for the same detector in the reproducibility test as S .
max
Designate the lowest of the values measured in this test and that measured for the same detector in the
.
reproducibility test as S
min
5.5.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
a) the detector shall emit neither alarm nor fault signals during the test when in air free of CO.
b) the ratio of the response threshold values S : S shall not be greater than 1,6.
max min
c) the lowest response threshold value S shall not be less than 25 µl/l.
min
5.6 Variation in supply parameters
5.6.1 Object
To show that, within the specified range(s) of the supply parameters (e.g. voltage), the sensitivity of the
detector is not unduly dependent on these parameters.
5.6.2 Test procedure
The response threshold value of the specimen shall be measured as described in 5.1.5, at the upper and
lower limits of the supply parameter (e.g. voltage) range(s) specified by the manufacturer.
The maximum response threshold value shall be designated S and the minimum value shall be designated
max
S .
min
NOTE For conventional detectors the supply parameter is the dc voltage applied to the detector. For other types of
detector (e.g. analogue addressable) signal levels and timing may need to be considered. If necessary the manufacturer
may be requested to provide suitable supply equipment to allow the supply parameters to be changed as required.
5.6.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
a) the ratio of the response threshold values S : S shall not be greater than 1,6.
max min
b) the lower response threshold value S shall not be less than 25 µ/l/l.
min
5.7 Air movement
5.7.1 Object
To show that the sensitivity of the detector is not unduly affected by the rate of the airflow.
5.7.2 Test Procedure
The response threshold value of the specimen to be tested shall be measured as described in 5.1.5 in the
most and least sensitive orientations, and shall be appropriately designated S and S .
(0,2)max (0,2)min
These measurements shall then be repeated but with an air velocity, in the proximity of the detector, of
(1 ± 0,2) m/s. The response threshold values in these tests shall be designated S and S .
(1,0)max (1,0)min
5.7.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
S + S
(0,2)max (0,2)min
a) 0,625≤ ≤1,6
S + S
(1,0)max (1,0)min
b) the lower response threshold value S shall be not less than 25 µl/l.
min
5.8 Dry heat (operational)
5.8.1 Object
To demonstrate the ability of the detector to function correctly at high ambient temperatures appropriate to the
anticipated service environment.
5.8.2 Test procedure
The specimen to be tested shall be installed in the gas test chamber described in Annex A, in its least
sensitive orientation, with an initial air temperature of (23 ± 5) °C, and shall be connected to its supply and
monitoring equipment.
The gas test chamber shall be installed in a climatic chamber and the air temperature in the gas test chamber
-1
shall then be increased to (55 ± 2) °C, at a rate not exceeding 1 Kmin , and maintained at this temperature for
2 h.
The CO response threshold value shall then be measured as described in 5.1.5 but with the temperature at
(55 ± 2) °C.
The greater of the CO response threshold value measured in this test and that measured for the same
specimen in the reproducibility test shall be designated S and the lesser shall be designated S .
max min
5.8.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
a) no alarm or fault signal shall be given during the period that the temperature is increasing to the
conditioning temperature or during the conditioning period until the CO response threshold value is
measured.
b) the ratio of the CO response threshold values S : S shall not be greater than 1,6.
max min
c) the lower response threshold value S shall be not less than 25 µl/l.
min
5.9 Dry heat (endurance)
5.9.1 Object
To demonstrate the ability of the detector to withstand the long term effects of high temperature in the service
environment. (e.g. changes in electrical properties of materials, chemical reactions, etc.).
5.9.2 Test procedure
5.9.2.1 Reference
The test apparatus and procedure shall be as described in and EN 60068-2-2:1993 as amended by
EN 60068-2-2:1993/A1:1993. Tests for non heat-dissipating specimens (i.e. Tests Ba or Bb) will be applicable.
Test Ba (with sudden changes in temperature) may be used, to improve test economy, if it is known that the
sudden change in temperature will not be detrimental to the specimen.
5.9.2.2 State of the specimen during conditioning
The specimen shall be mounted as described in 5.1.3 but shall not be supplied with power during the
conditioning.
5.9.2.3 Conditioning
The following conditioning shall be applied:
 Temperature: (55 ± 2)°C
 Duration: 21 days
5.9.2.4 Final measurements
After a recovery period, of between 1 h and 2 h in standard laboratory conditions, the CO response threshold
value shall be measured as described in 5.1.5.
The greater of the CO response threshold value measured in this test and that measured for the same
specimen in the reproducibility test shall be designated S and the lesser shall be designated S .
max min
5.9.3 Requirements
The detector shall be deemed to comply with the requirements of this sub-clause if:
a) no fault signal, attributable to the endurance conditioning, shall be given on reconnection of the specimen.
b) the ratio of the CO response threshold values S : S shall not be greater than 1,6.
max min
c) the lower response threshold value S shall be not less than 25 µl/l.
min
5.10 Cold (operational)
5.10.1 Object
To demonstrate the ability of the detector to function correctly at low ambient temperatures appropriate to the
anticipated service environment.
5.10.2 Test procedure
5.10.2.1 Reference
The test apparatus and procedure shall be as described in EN 60068-2-1:1993 as amended by EN 60068-2-
1:1993/A1:1993 and EN 60068-2-1:1993/A2:1994, Test Ab and as described below.
5.10.2.2 State of the specimen during conditioning
The specimen to be tested shall be installed in the gas test chamber described in Annex A, in its least
sensitive orientation, with an initial air temperature of (23 ± 5) °C, and shall be connected to its supply and
monitoring equipment.
The gas test chamber shall be installed in a climatic chamber and the air temperature in the gas test chamber
-1
shall then be decreased to (-10 ± 3) °C, at a
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