EN 50379-1:2012

SLOVENSKI STANDARD
01-junij-2012
Specifikacija za prenosne električne naprave za merjenje parametrov dimnih
plinov grelnih naprav - 1. del: Splošne zahteve in preskusne metode
Specification for portable electrical apparatus designed to measure combustion flue gas
parameters of heating appliances - Part 1: General requirements and test methods
Anforderungen an tragbare elektrische Geräte zur Messung von
Verbrennungsparametern von Heizungsanlagen - Teil 1: Allgemeine Anforderungen und
Prüfverfahren
Spécification pour les appareils électriques portatifs conçus pour mesurer les paramètres
des gaz de combustion dans les conduits d'évacuation des appareils de chauffage -
Partie 1: Prescriptions générales et méthodes d'essai
Ta slovenski standard je istoveten z: EN 50379-1:2012
ICS:
13.040.40 Emisije nepremičnih virov Stationary source emissions
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50379-1
NORME EUROPÉENNE
April 2012
EUROPÄISCHE NORM
ICS 13.320 Supersedes EN 50379-1:2004

English version
Specification for portable electrical apparatus designed to measure
combustion flue gas parameters of heating appliances -
Part 1: General requirements and test methods

Spécification pour les appareils Anforderungen an tragbare elektrische
électriques portatifs conçus pour mesurer Geräte zur Messung von
les paramètres des gaz de combustion Verbrennungsparametern von
dans les conduits d'évacuation des Heizungsanlagen -
appareils de chauffage - Teil 1: Allgemeine Anforderungen und
Partie 1: Prescriptions générales et Prüfverfahren
méthodes d'essai
This European Standard was approved by CENELEC on 2012-03-19. 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, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50379-1:2012 E
Contents
Foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements . 9
4.1 G ener al . 9
4.2 Construction . 9
4.3 Labelling and instructions . 12
5 Test methods . 13
5.1 General requirements for tests . 13
5.2 Normal conditions for tests . 14
5.3 Mechanical tests . 16
5.4 Electrical and software tests . 18
5.5 Tests with test gases . 18
5.6 Tests with real flue gases . 20
5.7 Calculated values . 22
5.8 Temperature . 23
5.9 Pressure . 24
Annex A (informative) Standard combustion analysis procedures . 25
A.1 Combustion analysis in Germany . 25
A.2 Combustion analysis in the United Kingdom. 26
A.3 Combustion analysis in Italy . 27
A.4 Combustion analysis in Switzerland . 29
A.5 Combustion analysis — generic . 31
Annex B (normative) Real flue gas measurements – Methodology and test methods . 32
Annex C (normative) Standard methods for determining measuring uncertainty . 35
C.1 Determination of the analytic function . 35
C.2 Determination of reproducibility . 35
Bibliography . 36
Figure
Figure B.1 – CO, NO and SO variation with air ratio . 34
Tables
Table 1 – Requirements for accuracy . 11
Table 2 – Test gas mixtures for O and/or CO sensors . 14
2 2
Table 3 – Test gas mixtures for low range CO sensors . 14
Table 4 – Test gas mixtures for medium range CO sensors . 15
Table 5 – Test gas mixture for high range CO sensors . 15
Table 6 – Test gas mixtures for NO sensors . 15
Table 7 – Test gas mixtures for SO sensors . 15
Table A.1 – Legal requirements for maximum waste gas loss . 25

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Table A.2 – Parameters for calculation in Germany . 26
Table A.3 – Current standards for combustion efficiencies of domestic gas appliances in the
United Kingdom, based on dry air-free measurements . 27
Table A.4 – Legal requirements for combustion efficiency η in Italy . 28
Table A.5 – Parameters for heat loss calculation in Italy (reference UNI 10389) . 28
Table B.1 – Minimum numbers of measurements . 32

Foreword
This document (EN 50379-1:2012) has been prepared by CLC/TC 216 "Gas detectors".
The following dates are fixed:

(dop) 2013-03-19
• latest date by which this document h
as to be implemented at national
level by publication of an identical
national
standard or by endorsement
(dow) 2015-03-19
• latest date by which the national
standards conflicting with this
document have to be withdrawn
This document supersedes EN 50379-1:2004.

— 4.2.12 and 5.7.4 consider 15 min. average concentration for solid fuels;

— 4.3.3 for instructions was amended;

— 5.3.6 for flow indicators was amended;

— 5.5.7 considers calibration curves for sensors with nonlinear signal;

— 5.5.8 considers influence of pressure variations;

— 5.5.9 considers the influence of water vapour on the gas signal;

— 5.7.2 for calculated values was amended;

— 5.9.1 was amended to cover measurement at the circular orifice.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

____________
- 5 - EN 50379-1:2012
Introduction
This European Standard covers apparatus for measuring gas concentrations and other combustion
parameters, as used in the installation and maintenance of heating appliances. It forms a
specification for portable electrical apparatus designed to measure combustion flue gas parameters
of heating appliances, and includes the following parts under the generic title Specification for
portable electrical apparatus designed to measure combustion flue gas parameters of heating
appliances:
Part 1: General requirements and test methods;
Part 2: Performance requirements for apparatus used in statutory inspections and assessments;
Part 3: Performance requirements for apparatus used in non-statutory servicing of gas fired heating
appliances.
EN 50379-1 specifies general requirements for the construction, testing and performance of portable
spot reading apparatus designed to give an assessment of specific combustion flue gas parameters,
such as concentrations of gaseous compounds, temperature and/or pressure, to check the
combustion performance of heating appliances for domestic residential and commercial applications,
using commercially available fuels.
EN 50379-2 is for apparatus intended to be used for statutory measurement. In several European
countries, legal requirements exist for the performance of heating appliances (see Annex A).
Authorised inspectors use these apparatus to measure the flue gas parameters, in order to test
compliance with national regulations. Due to the legal consequences resulting from the
measurement, there are strict requirements regarding the measuring uncertainty of these apparatus,
and EN 50379-2 therefore includes maximum values for measuring uncertainty. Tests with real flue
gases form a key part of the verification of the performance of the apparatus for statutory
measurement. The measuring uncertainty has to be justified by internationally accepted methods
over the whole measuring range. The determination of measuring uncertainty is described in
Annex C.
EN 50379-3 is for apparatus intended to be used for non-statutory applications. There are reduced
performance requirements, because the apparatus are designed to decide whether maintenance for
a gas fired appliance is required, and for adjusting the appliance during maintenance. There will be
no determination of the measuring uncertainty for the apparatus.

1 Scope
This European Standard covers apparatus for measuring gas concentrations and other combustion
parameters, as used in the installation and maintenance of heating appliances. Such apparatus may
be used for testing the performance of appliances for different types of fuels, either by the installer,
maintenance engineer or inspector.
The apparatus may consist of different functional modules, which may be tested separately for
complying with this standard and will be combined in different ways according to the different
applications. This part of EN 50379 specifies the general requirements and is supplemented by the
requirements in EN 50379-2 and/or EN 50379-3.
This European Standard specifies general requirements for the construction, testing and
performance of portable spot reading apparatus designed to give an assessment of specific
combustion flue gas parameters, such as concentration of gaseous compounds, temperature and/or
pressure, to check the combustion performance of heating appliances for domestic residential and
commercial applications, using commercially available fuels.
This European Standard excludes apparatus for
– continuous emission, safety monitoring and control, and
– use in vessels with an international load line.
NOTE 1 When this apparatus is used in industrial premises national regulations may apply.
NOTE 2 Apparatus may contain functional modules which are not covered by this standard e.g. measurement
of smoke spot number (see EN 267:2009+A1:2011, Annex A) and/or measurement of indoor ambient air (see
EN 50543).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 267:2009+A1:2011, Automatic forced draught burners for liquid fuels
EN 297, Gas-fired central heating boilers – Type B11 and B11BS boilers, fitted with atmospheric
burners of nominal heat input not exceeding 70 kW
EN 676, Automatic forced draught burners for gaseous fuels
EN 50270:2006, Electromagnetic compatibility – Electrical apparatus for the detection and
measurement of combustible gases, toxic gases or oxygen
EN 50271:2010, 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 50379-2:2012, Specification for portable electrical apparatus designed to measure combustion
flue gas parameters of heating appliances – Part 2: Performance requirements for apparatus used in
statutory inspections and assessment

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EN 50379-3:2012, Specification for portable electrical apparatus designed to measure combustion
flue gas parameters of heating appliances – Part 3: Performance requirements for apparatus used in
non-statutory servicing of gas fired heating appliances
EN 50543, Electronic portable and transportable apparatus designed to detect and measure carbon
dioxide and/or carbon monoxide in indoor ambient air – Requirements and test methods
EN 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
(IEC 60068-2-6)
EN 60335-1:2002, Household and similar electrical appliances – Safety – Part 1: General
requirements (IEC 60335-1:2001, mod.)
EN 60359:2002, Electrical and electronic measurement equipment – Expression of performance
(IEC 60359:2001)
EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
CR 1404:1994, Determination of emissions from appliances burning gaseous fuels during type-
testing
ISO/IEC Guide 98-3:2008, Uncertainty of measurement – Guide to the expression of uncertainty in
measurement (GUM:1995)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 60359:2002, 2.1 and the
following apply.
3.1
domestic residential and commercial premises
any place of residence of a household, family or person (whether temporary or permanent) and
commercial premises whether residential or not and including recreational boats, caravans and
mobile homes
3.2
ambient air
normal atmosphere surrounding the apparatus
3.3
clean air
ambient air which is essentially free of flue gas and of interfering or contaminating substances
3.4
synthetic air
technically produced air consisting of oxygen and nitrogen
3.5
sensor
assembly in which the sensing element is housed and which may contain associated circuit
components
3.6
sensing element
device, the output of which will change with variation of the parameter of interest

3.7
spot reading
apparatus intended to be used for short periods of time in the range of minutes, as required
3.8
volume ratio (V/V)
ratio of the volume of a component to the volume of the gas mixture under specified conditions of
temperature, pressure and relative humidity
3.9
mains powered apparatus
apparatus designed to be powered by the domestic mains electrical supply with or without an
additional power source
3.10
battery powered apparatus
apparatus designed to be energised from batteries alone, whether disposable or rechargeable
3.11
probe
part of the apparatus that is placed in the stack or flue of the heating appliance, for the purpose of
sampling the gas and/or for measuring temperature or pressure
3.12
initial start up delay
time taken for the apparatus to reach the operating mode from switch-on, or after replacing batteries,
or following power failure in the case of mains powered equipment
3.13
calibration
process of determining the deviation of an apparatus relative to a reference
3.14
reference
in laboratory tests, a reference gas will be a certified calibration gas cylinder. For real gas
measurement, the reference is a measuring device with high accuracy (e.g. as specified in EN 267).
For temperature and pressure measurement, the reference is a measuring device with certification
proving traceability to a national or international metrology institute
3.15
adjustment
process of tuning the apparatus, in order to return the deviation found in calibration to within the
admissible error
3.16
functional module
all components required for one measurement task, including both hardware and software
Note 1 to entry: A functional module may consist of one or more separate pieces of equipment or may be
completely integrated with the apparatus.
3.17
response time (t )
time interval with the apparatus in a warmed-up condition, between the time when an instantaneous
variation of the parameter to be measured is produced at the apparatus inlet, and the time when the
response reaches and remains beyond 90 % of the final indication

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4 General requirements
4.1 General
The apparatus shall reliably measure specific combustion flue gas parameters and shall clearly
display the result. If the apparatus is equipped with a sampling system (probe) the gas sample shall
be drawn into the unit for analysis via the sampling system for all tests. All parts of the apparatus
shall conform to the construction requirements of 4.2 and the performance requirements in
EN 50379-2 and/or EN 50379-3.
4.2 Construction
4.2.1 General
All parts of the apparatus, including the sensor(s), shall be constructed of materials that will not be
adversely affected by vapours and gases or chemical substances to be expected during normal
operation of the apparatus, see 4.3.3 h). Similar consideration shall also be given to the sampling
system and components that can be in contact with the gas, as appropriate. The probe shall be
constructed of materials that will not be adversely affected by environmental conditions found in
heating appliances within the scope of this standard.
4.2.2 Sampling system
The sampling system of the apparatus shall be so constructed as to prevent damage to the sensor(s)
and pump by particulate matter and liquids that may be expected during normal operation of the
apparatus. Means shall be provided to recognise and/or indicate the working mode of the pump by,
for example
– pump noise,
– visual indication, or
– flow measurement.
Condensation or absorption effects have to be considered, and shall have no significant influence on
the indicated values, particularly when determining SO and NO. The probe shall be constructed in
such a manner that droplets of condensation will not influence the result of temperature
measurements even when the probe is held vertically. In addition the temperature sensing element
shall not touch the probe outer sheath. If simultaneous recording of temperature and gaseous
compounds is required, the probe shall be constructed such that the distance between the sensing
element for temperature and the gas inlet, is less than 8 mm. If probes of different lengths are
provided the shortest and the longest shall be tested with the instrument.
NOTE For apparatus intended to measure heating combustion efficiency (see Annex A) reference should be
made to national regulations where appropriate. Typically the following dimensions have been shown to be
suitable:
- sampling probe immersion depth of at least 150 mm;
- probe external diameter between 6 mm and 13 mm (required for the measurement of heat loss only); and
- adjustable depth stop to be provided, to fix probe position and cover measuring aperture up to 21 mm
diameter, to prevent air ingress.
The method of testing tightness of the complete gas sampling system, as specified by the
manufacturer, shall be checked and verified for use in practice.

4.2.3 Adjustments
Access to sensitivity controls shall only be possible by the use of special tool or a software passcode
or by destroying a special seal. Any regular checks shall be performed automatically or by access as
described above.
4.2.4 Power supply
Apparatus which derives its power from internal batteries may give a visual warning before the
battery capacity falls to a point where either the apparatus sensitivity or the stated display accuracy
falls outside the requirements. When this point is actually reached, a clear indication shall be given to
alert the user and the display shall switch out of normal operational mode.
4.2.5 Display
Indicators shall be provided to show the following:
– measured parameter(s), value(s) and physical unit;
– low battery warning;
– mode of operation or instrument status (e.g. warm-up, measurement);
– when values lie outside the indicating range; and
– software version.
All values shall be indicated on a display with characters not less than 8 mm high unless adequate
provision is made for enhancing the legibility (e.g. backlighting) in which case the minimum character
height shall be 4 mm.
For each separate parameter measured the apparatus shall display the value, the physical unit and
parameter description. For a combination of parameters the display may switch automatically from
one indication to another. If the display switches between information of simultaneous parameters it
shall be clear and understandable. Displayed measured values shall be refreshed at intervals no
greater than 3 s. If the apparatus is equipped with seven-segment displays it shall have a device or
self testing function for checking the displays.
4.2.6 Measuring range and resolution
Table 1 lists the different parameters covered by this standard. For each parameter given it specifies
– minimum indication range;
– minimum display resolution;
– accuracy of the apparatus;
– the detection limit; and
– maximum response time.
4.2.7 Indication range
The indication ranges are the minimum ranges for the apparatus. Higher ranges are allowed, but will
not change the values for accuracy or detection limit.

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4.2.8 Accuracy of the apparatus
The values in Table 1 e.g. “± 20 ppm or 5 % rel.” have the meaning: “The permitted deviation is up to
± 20 ppm or ± 5 % of the reading, whichever is the greater”.
4.2.9 Detection limit
Values indicated below the detection limit are not significant.
4.2.10 Efficiency
Efficiency is not included in the table as determination varies considerably from country to country
(see Annex A for further details).
Table 1 – Requirements for accuracy
Indication Display Detection Response time
Parameter Accuracy
range resolution limit (t )
CO (low) 0 ppm - 1 ppm 10 ppm 90 s
± 10 ppm
200 ppm
or 10 %
rel.
CO (medium) 0 ppm - 1 ppm ± 20 ppm or 20 ppm 90 s
2 000 ppm
5 % rel.
CO (high) 0 ppm - 10 ppm ± 100 ppm 100 ppm 90 s
20 000 ppm
or 10 % rel.
NO 0 ppm - 1 ppm 5 ppm 90 s
± 5 ppm
600 ppm
or 5 %
rel.
SO 0 ppm - 1 ppm 10 ppm 180 s
2 ± 10 ppm or
500 ppm
5 % rel.
O 0 %- 21 % V/V 0,1 % ± 0,3 % V/V 0,3 % V/V 30 s
CO 0 % - 20 % V/V 0,1 % 0,3 % V/V 50 s
2 ± 0,3 % V/V
Temperature 1 °C for EN 50379-2: 30 s
0 °C - 400 °C 1 °C ± 2 °C or
(flue gas) for EN 50379-3: 50 s
1,5 % rel.
Temperature 1 °C 70 s
0 °C - 100 °C 1 °C ± 1 °C
(inlet air)
Pressure -50 Pa to 1 Pa ± 2 Pa 1 Pa 10 s
(draught and +200 Pa
or 5 %
circular orifice rel.
differential
pressure)
Pressure 0 Pa - 10 Pa 100 Pa 10 s
± 50 Pa
(differential) 10 000 Pa
or
1 % rel.
a a
Heat loss 0 % - 100 % 0,1 % N/A N/A N/A
b b
CO/CO ratio 0 – 0,01 0,000 1 N/A N/A N/A
a
Calculated from the fuel characteristics and measured parameters - either O or CO , temperature of flue gas and
2 2
temperature of inlet air, in accordance with national regulations.
b
Calculated from the fuel characteristics and the measured parameters of CO and either O or CO , in accordance
2 2
with national regulations.
4.2.11 Printer or data storage
If the apparatus is provided with a printer or any means for data storage e.g. a data logger it shall
print the date, time and values of all parameters, as specified in 4.2.6, taken at the time of the
printout.
4.2.12 Average concentration (apparatus intended for appliances burning solid fuels)
The apparatus intended to be used for appliances burning solid fuels shall be able to carry out a
measurement for oxygen and CO over a defined period. For the purpose of type testing the period is
specified with 15 min. After finishing the measurement the concentration shall be indicated as
average value.
The sample rate for averaging shall be minimum one per second.
NOTE The period for averaging may be different in national regulations.
The time period for averaging shall be in conformance with national regulations.
4.3 Labelling and instructions
4.3.1 General
The text used for labels and instructions shall be in accordance with appropriate national regulations.
4.3.2 Labelling
Durable label(s) shall be carried on the apparatus, or moulded into the casing, giving at least the
following information:
a) the manufacturer’s or supplier’s name, trademark or other means of identification;
b) the type of apparatus, e.g. “combustion gas analyser”, and model name or number;
c) either the number of this European Standard or the third party certification;
d) the manufacturer’s serial number and/or production batch date code;
e) the replacement battery and mains power requirements, as relevant;
f) whether or not the instrument is suitable for outdoor use (see 5.3.2, 5.5.3 and 5.6.3).
Item (e) shall be clearly visible if the batteries are being changed.
External label(s) shall comply with EN 60335-1:2002, 7.6 and 7.14.
4.3.3 Instructions
The apparatus shall be provided with an instruction manual giving complete, clear and accurate
instructions for the safe and proper operation and regular checking of the apparatus. It shall also
include the following:
a) a statement of compliance with Part 2 and/or Part 3 of this European Standard, specified for the
whole apparatus or for the defined functional module(s);
b) the specific type(s) of fuel for which the apparatus is intended to be used;
c) the correct battery type(s) and method of replacing or recharging batteries, for battery powered
units, details of mains voltage, frequency and fuse rating, if relevant, and a warning of the
possible hazards of electric shock or malfunction, if tampered with;
d) warnings against continuous use, or use as a safety alarm;
e) an explanation of all indications including information on values calculated, not measured;
f) for apparatus complying with Part 2, the recommended minimum time required to perform one
complete measurement cycle and achieve correct indication of the measured values(s);
g) for apparatus complying with Part 3, the recommended minimum time required for one checking
procedure;
h) a list of commonly occurring materials, vapours or gases (e.g. cleaning fluids, polishes, paints,
cooking operations, etc.) which may affect the operation or reliability of the apparatus, in the
short or long term;
i) guidance on the life expectancy of the sensor(s) and batteries;

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j) details of operational limitations, including ambient temperature and humidity ranges, and
whether the apparatus is intended to be placed in an appropriate case during transportation
and/or normal operation;
k) details of initial start up delay following switch on and after battery replacement;
l) instructions for checking, testing and/or replacing sensing elements (where applicable) dust filter
and water trap, and calibration and/or adjustment of the apparatus on a routine basis;
m) a warning that, when using the apparatus, a full visual inspection of the appliance shall also be
carried out to ensure its safe operation;
n) a warning of potential error due to solubility of target gas in water if the apparatus contains a
water trap or filter;
o) instructions for testing leaks and/or blockages of the gas sampling system (see also 5.3.6);
p) all user changeable parameters and their valid ranges;
q) life time of data storage if a back-up battery is used for preserving the data content of parameter
memory when the supply voltage is removed.
5 Test methods
5.1 General requirements for tests
5.1.1 General
The manufacturer shall specify for which fuel(s) and for which parameters or combination of these,
the apparatus or module(s) shall be tested as described in this clause and shall comply with the
performance requirements listed under the corresponding clause numbers in Part 2 and/or Part 3 of
this standard. All relevant tests of this standard shall be carried out.
Apparatus may contain functional modules which are not covered by this standard, e.g. measurement
of smoke spot number (see EN 267:2009+A1:2011, Annex A) and/or measurement of indoor ambient
air (see EN 50543).
If the apparatus has a modular structure allowing different combinations of parameters to be
measured and displayed with different accessories, such as with probes or filters fitted, it shall
clearly state in the manual which parameters and combinations are tested to comply with which parts
of this standard or additional standards (e.g. EN 267 or EN 50543).
NOTE Modules added at a later stage for additional parameters may be tested separately.
5.1.2 Samples and sequence of tests
Details of the samples needed and the sequence of testing to be followed are given in
EN 50379-2:2011, 5.1.2 and EN 50379-3:2011, 5.1.2, as appropriate. Tests shall first be carried out
to ensure that the apparatus satisfies the constructional requirements of 4.2 and the requirements for
labelling and instructions of 4.3 as appropriate.
5.1.3 Preparation of samples
The sample apparatus shall be prepared in accordance with the manufacturer's instructions. If the
apparatus is normally used in its carrying case then the test shall be carried out with the apparatus in
the carrying case.
5.1.4 Test facility
The construction of the test gas delivery system shall be such as to ensure that the gas sensor(s) are
exposed to a specific volume ratio of test gas in a reproducible manner. The flow rate of test gas
shall be matched to the sampling rate of the apparatus without causing significant pressure
variations.
5.2 Normal conditions for tests
5.2.1 General
The normal test conditions in 5.2.2 to 5.2.8 shall be used for all tests unless otherwise specified.
5.2.2 Cylinder test gases
5.2.2.1 Requirements
The cylinder test gases listed below shall be
– used to perform the tests in 5.3.4, 5.3.5, 5.4.2 to 5.4.4, 5.5.3 to 5.5.7, 5.5.9, 5.6.5 to 5.6.7, 5.7.3
and 5.7.4,
– within the range of ± 5 % relative (for volume ratios below 100 ppm within ± 10 % relative) of the
volume ratios given in the tables, but known within ± 2 % relative and greater than 99,99 % purity
for nitrogen.
5.2.2.2 Test gas mixtures for O and/or CO sensors
2 2
When fitted with an oxygen and/or carbon dioxide sensor the apparatus shall be tested with gases of

known volume ratio as shown in Table 2.
Table 2 – Test gas mixtures for O and/or CO sensors
2 2
a
Gas mixture O CO CO SO C H Balance
2 2 2 3 8
1 1,6 % 12,0 % 950 ppm 80 ppm 70 ppm Nitrogen
2 5,0 % 9,0 % 150 ppm 80 ppm 70 ppm Nitrogen
3 16,5 % 2,5 % 950 ppm 80 ppm 70 ppm Nitrogen
a
To be omitted, at the manufacturer’s request, when the apparatus under test is intended only for use with
natural gas and/or LPG.
5.2.2.3 Test gas mixtures for low range CO sensors
When fitted with a sensor for measuring carbon monoxide in the low range the apparatus shall be
tested with gases of known volume ratio as shown in Table 3.
Table 3 – Test gas mixtures for low range CO sensors
a
Gas mixture CO H Balance
1 150 ppm 75 ppm Air
2 50 ppm  Air
a
To be omitted, at the manufacturer’s request, when the apparatus under test is intended only for
EN 50379-3.
5.2.2.4 Test gas mixtures for medium range CO sensors
When fitted with a sensor for measuring carbon monoxide in the medium range the apparatus shall
be tested with gases of known volume ratio as shown in Table 4.

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Table 4 – Test gas mixtures for medium range CO sensors
a
Gas mixture O CO H CH Balance
2 2 4
1 2,5 % 950 ppm 500 ppm Nitrogen

2 ----- 950 ppm   Air
3 ----- 150 ppm  150 ppm Air
a
To be omitted, at the manufacturer’s request, when the apparatus under test is intended only for
EN 50379-3.
5.2.2.5 Test gas mixture for high range CO sensors
When fitted with a carbon monoxide sensor for the high measuring range the apparatus shall be
tested with gas of known volume ratio as shown in Table 5 in addition to the gas mixtures shown in
Table 4.
Table 5 – Test gas mixture for high range CO sensors
Gas mixture CO Balance
1 8 000 ppm Air
5.2.2.6 Test gas mixtures for NO sensors
When fitted with a nitric oxide sensor the apparatus shall be tested with gases of known volume ratio
as shown in Table 6.
Table 6 – Test gas mixtures for NO sensors
Gas mixture NO Balance
1 50 ppm Nitrogen
2 200 ppm Nitrogen
3 450 ppm Nitrogen
5.2.2.7 Test gas mixtures for SO sensors
When fitted with a sulphur dioxide sensor the apparatus shall be tested with gases of known volume
ratio as shown in Table 7.
Table 7 – Test gas mixtures for SO sensors
Gas mixture SO Balance
1 50 ppm Air
2 200 ppm Air
3 450 ppm Air
5.2.3 Measurements on heating appliances
For flue gas measurement under realistic conditions (including the influence of high humidity and
cross interferences with other compounds of the flue gas) it is essential to test with heating
appliances using the type(s) of fuel for which the apparatus is designed. The following appliances
shall be used for the relevant tests:
a) atomizing oil burners of monobloc type (for extra light fuel oil) as defined in EN 267;
b) automatic forced draught burners for gaseous fuels as defined in EN 676;
c) gas-fired central heating boilers with atmospheric burners as defined in EN 297.
For apparatus designed to measure the flue gas of gaseous fuels, both types of burners b) and c) shall be used.
Suitable appliances for additional type testing with solid fuels (e.g. coal and wood) or other types of
fuel will be chosen at the discretion of the test house. In this case, the test house shall take particular
care to keep detailed records of all test conditions.
5.2.4 Power supply
Unless otherwise specified for the particular test mains voltages shall be within ± 2 % of the nominal
values quoted by the manufacturer. Battery powered apparatus shall be fitted with new or fully
charged battery/batteries at the start of each test, where appropriate.
For flue gas tests only the mains voltage supply may be allowed to vary ± 10 % from nominal values.
5.2.5 Temperature
Unless otherwise specified for the particular test the synthetic air and test gas mixtures shall be at a
constant temperature ± 2 °C, within the range 15 °C to 25 °C for the duration of each test.
For flue gas tests only the ambient air temperature may rise to a maximum of 40 °C.
5.2.6 Humidity
Unless otherwise specified for the particular test the ambient air shall be at a constant relative
humidity ± 10 % within the range 30 % to 70 % for the duration of each test.
5.2.7 Pressure
Except for 5.5.8, 5.6.4 and 5.8.7 tests shall be performed using air, test gas and real flue gas at
constant pressure ± 1 kPa within the range of 86 kPa to 108 kPa throughout the duration of the test.
5.2.8 Exchangeable parts
If the manufacturer supplies different types of accessories or optional filters, water traps and/or
probes for the same parameter measurement, then the apparatus shall be tested under the
conditions which give the most unfavourable result for the test being conducted.
5.3 Mechanical tests
5.3.1 General
If the apparatus is designed to be used in a protection case this shall be clearly mentioned in the
instruction manual and shall be subjected to the mechanical tests from 5.3.3 to 5.3.5 in this
protection case.
- 17 - EN 50379-1:2012
5.3.2 Degree of protection
The enclosure of the apparatus shall provide at least an IP40 degree of protection when all probes
etc. are connected, in accordance with EN 60529:1991, Clauses 12 and 14. If an apparatus is
designed for outdoor use it shall provide at least an IP42 degree of protection when connected
similarly. The apparatus shall be tested in accordance with EN 60529:1991, Clauses 12 and 14.
5.3.3 Impact strength
The apparatus shall be tested in accordance with the test specified in EN 60335-1:2002, Clause 21,
with the following modification to the third paragraph:
“The apparatus is rigidly supported, and three blows are applied to every point of the enclosure that
is likely to be weak with an impact energy of (1,0 ± 0,2) J".
5.3.4 Vibration
The appropriate test, as defined in EN 60068-2-6, shall be applied with the following parameters:
NOTE The test may be replaced by the procedure 1 from EN 60079-29-1.
- frequency range 10 Hz to 150 Hz;
- vibration amplitude 0,35 mm;
- duration of endurance 10 sweep cycles per axis.
Mount the apparatus in its normal operating orientation and apply the vibration along each of the
three mutually perpendicular major axes in turn. Subject the apparatus to one of the most appropriate
test gas mixtures as described in 5.2.2.
5.3.5 Drop
Drop the apparatus, including the probe and any interconnecting wiring and tubing, in its normal
operating orientation from a height of 0,5 m onto concrete. The apparatus shall be subjected to this
test in a case intended to provide protection during transportation, if one is supplied with the
apparatus. Subject the apparatus to one of the most appropriate test gas mixtures as described in
5.2.2.
5.3.6 Flow indicator (if fitted)
For apparatus fitted with an integral flow indicator blockage of the gas path shall be simulated.
Operation of the apparatus shall be checked by visual inspection to ensure that the blockage is
recognised and that appropriate warning is given and incorrect measured values are not displayed.
If no flow indication is provided the user manual has to specify that the test for leaks and/or
blockages (see 4.3.3 o)) shall be carried out before each use of the equipment.
5.3.7 Dust filter and water trap
Install the test apparatus on an oil burning appliance with a smoke spot number of 4,0 ± 0,5 for 1 h
(see EN 267:2009+A1:2011, Annex A). At the request of the manufacturer this test may be
performed with the sensor(s) removed.
Install the test apparatus on a natural gas burning appliance with a flue gas dewpoint of about 50 °C
for 1 h.
After testing the water trap and the dust filter shall be checked by visual inspection.
5.4 Electrical and software tests
5.4.1 Electromagnetic Compatibility (EMC)
Test the apparatus, including the probe and any interconnecting wiring and tubing, for
electromagnetic compatibility in accordance with EN 50270 for Type 1 (domestic) and shall meet the
requirements of EN 50270:2006, Table 5.
5.4.2 Supply voltage variations (not applicable to battery powered apparatus)
Power the equipment at the rated supply voltage U and frequency. Subject the apparatus to one of
n
the test gas mixtures for all gas parameters to be tested as described in 5.2.2, at a rated supply
voltage of U + 10 %. Repeat the test at a supply voltage of U – 10 %.
n n
5.4.3 Battery fault condition (applicable only to battery powered apparatus)
Connect the apparatus to a stabilized power supply and set to the rated battery voltage. Decrease
the supply voltage in steps of 0,1 V, at intervals of at least 1 min, until the battery fault warning is
given. Record the supply voltage at which the fault condition is given as U . Set the supply voltage
e
one step above U and subject the apparatus to one of the test gas mixtures for all gas parameters
e
to be tested as described in 5.2.2.
5.4.4 Battery reversal (applicable only to battery powered apparatus)
The battery reversal test shall be applied to apparatus incorporating replaceable batteries if there is
any possibility of the apparatus being subjected to reversed polarity of supply during normal battery
replacement. In this case, remove the battery and insert it into the apparatus with reverse polarity,
switch on the apparatus, then remove the battery and reinsert it with correct polarity. Switch on the
apparatus and subject it to one of the test gas mixtures for all gas parameters to be tested as
described in 5.2.2.
5.4.5 Software and digital techniques
Software and digital components shall comply with EN 50271:2010, 4.1.1 to 4.1.3, 4.4, 5.1 and 5.2
including 5.1.c requiring a software documentation according to 4.3.4.
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