SIST EN 13725:2022
(Main)Stationary source emissions - Determination of odour concentration by dynamic olfactometry and odour emission rate
Stationary source emissions - Determination of odour concentration by dynamic olfactometry and odour emission rate
This document specifies a method for the objective determination of the odour concentration of a gaseous sample using dynamic olfactometry with human assessors. The standard also specifies a method for the determination of the emission rate of odours from stationary sources, in particular:
- point sources (conveyed or ducted emissions);
- active area sources (e.g. biofilters);
- passive sources.
The primary application of this standard is to provide a common basis for evaluation of odour emissions.
When this document is used for the determination of the odour concentration or the odour emission rate of stationary source emissions, the other relevant European Standards concerning stationary source emissions apply, in particular EN 15259 and EN 16911-1, especially when measurements have to be in compliance with the relevant European Directives concerning industrial air emissions.
Even so, the analysis/quantification step of the measurement method described in this document (i.e. the determination of the odour concentration of an odorous gas sample, without respect to the origin of the sample itself) can be fully applied in many cases not related with industrial emission sources (e.g. the measurement of the mass concentration at the detection threshold of pure odorous substances, the determination of effectiveness of deodorizing systems for indoor air). In those latter cases, the requirements in this document concerning the measurement planning and the sampling of stationary sources can be ignored or adapted.
This document is applicable to the measurement of odour concentration of pure substances, defined odorant compounds and undefined mixtures of odorant volatiles in air or nitrogen, using dynamic olfactometry with a panel of human assessors being the sensor. The unit of measurement is the European odour unit per cubic metre: ouE/m3. The odour concentration is measured by determining the dilution factor required to reach the detection threshold. The odour concentration at the detection threshold is by definition 1 ouE/m3. The odour concentration is then expressed in terms of multiples of the detection threshold. The range of measurement is typically from 101 ouE/m3 to 107 ouE/m3 (including pre dilution).
The field of application of this document includes:
- the measurement of the mass concentration at the detection threshold of pure odorous substances in g/m3;
- the determination of the EROM value of odorants, in mol;
- the measurement of the odour concentration of mixtures of odorants in ouE/m3;
- the measurement of the emission rate of odorous emissions from point sources, active area sources and passive area sources, including pre dilution during sampling;
- the sampling of odorous gases from emissions of high humidity and temperature (up to 200 °C);
- the determination of effectiveness of end-of-pipe mitigation techniques used to reduce odour emissions.
The determination of odour emissions requires measurement of gas velocityto determine the gas volume flow rate.
The field of application of this document does not include:
- the measurement of odours potentially released by particles of odorous solids or droplets of odorous fluids suspended in emissions;
- the measuring strategy to be applied in case of variable emission rates;
- the measurement of the relationship between odour stimulus and assessor response above detection threshold (perceived intensity);
- measurement of hedonic tone (or (un)pleasantness) or assessment of annoyance potential;
- direct measurement of odour exposure in ambient air. For this measurement purpose, field panel methods exist which are the subject of CEN standard EN 16841-1, Ambient Air - Determination of odour in ambient air by using field inspection - Grid method;
- direct olfactometry, including field olfactometry;
- static olfactometry;
- measurement of odour recognition thresholds;
- measurement of odour identification thresholds.
.....
Emissionen aus stationären Quellen - Bestimmung der Geruchsstoffkonzentration durch dynamische Olfaktometrie und die Geruchsstoffemissionsrate
Dieses Dokument legt ein objektives Verfahren zur Bestimmung der Geruchsstoffkonzentration einer gasförmigen Probe durch dynamische Olfaktometrie mit Hilfe menschlicher Prüfpersonen fest. Das Dokument legt darüber hinaus ein Verfahren zur Bestimmung der Geruchsstoffemissionsrate aus stationären Quellen fest, und zwar insbesondere aus:
a) Punktquellen (geförderte oder geführte Emissionen);
b) aktiven Flächenquellen (z. B. Biofilter).
Der Hauptzweck dieses Dokuments besteht darin, eine allgemeine Grundlage für die Bewertung von Geruchsstoffemissionen zu liefern.
Wenn dieses Dokument zur Bestimmung der Geruchsstoffkonzentration oder der Geruchsstoffemissionsrate aus stationären Quellen verwendet wird, gelten die anderen relevanten Europäischen Normen in Bezug auf Emissionen aus stationären Quellen, insbesondere EN 15259 und EN ISO 16911 1, vor allem wenn Messungen die Anforderungen der relevanten Europäischen Richtlinien in Bezug auf Industrieemissionen in die Außenluft erfüllen müssen.
Desgleichen kann der in diesem Dokument beschriebene Analyse-/Quantifizierungsschritt des Messverfahrens (d. h. die Bestimmung der Geruchsstoffkonzentration einer gasförmigen Geruchsstoffprobe ungeachtet der Herkunft der Probe) in vielen Fällen unabhängig von industriellen Emissionsquellen uneingeschränkt angewendet werden (z. B. zur Messung der Massenkonzentration von Geruchsstoffen an der Wahrnehmungsschwelle, zur Bestimmung der Wirksamkeit von deodorierenden Systemen für Innenraumluft). In den letztgenannten Fällen können die Anforderungen in diesem Dokument in Bezug auf Messplanung und Probenahme aus stationären Quellen ignoriert oder angepasst werden.
Dieses Dokument ist anwendbar auf die Messung der Geruchsstoffkonzentration eines riechbaren Gases, definiert zusammengesetzter Geruchsstoffgemische und undefinierter Mischungen von Geruchsstoffen in Luft oder Stickstoff mit Hilfe der dynamischen Olfaktometrie durch ein Kollektiv menschlicher Prüfpersonen als Sensoren. Die Maßeinheit ist die Europäische Geruchseinheit je Kubikmeter: GEE/m3. Die Geruchsstoffkonzentration wird durch Bestimmung des zum Erreichen der Wahrnehmungsschwelle erforderlichen Verdünnungsfaktors gemessen. Die Geruchsstoffkonzentration an der Wahrnehmungsschwelle ist per Definition 1 GEE/m3. Die Geruchsstoffkonzentration wird dann als Vielfaches der Wahrnehmungsschwelle angegeben. Der Messbereich liegt üblicherweise zwischen 101 GEE/m3 und 107 GEE/m3 (einschließlich Vorverdünnung).
Émissions de sources fixes - Détermination de la concentration d'odeur par olfactométrie dynamique et du taux d'émission d'odeurs émanant de sources fixes
Le présent document définit une méthode objective pour déterminer la concentration d'odeur d'un échantillon gazeux par olfactométrie dynamique avec des sujets humains. Il spécifie également une méthode de détermination du taux d'émission d'odeurs provenant de sources fixes, notamment de :
a) sources ponctuelles (émissions rejetées dans l'atmosphère ou canalisées) ;
b) sources surfaciques actives (par exemple, biofiltres).
L'application principale du présent document est de fournir une base commune pour l'évaluation des émissions odorantes.
Lorsque le présent document est utilisé pour déterminer la concentration d'odeur ou le taux d'émission d'odeurs dans des émissions de sources fixes, les autres Normes européennes pertinentes concernant les émissions de sources fixes s'appliquent, en particulier l'EN 15259 et l'EN ISO 16911 1, notamment lorsque les mesures doivent être conformes aux Directives européennes applicables, relatives aux émissions atmosphériques industrielles.
Néanmoins, l'étape d'analyse/de quantification de la méthode de mesure décrite dans le présent document (c'est-à-dire la détermination de la concentration d'odeur d'un échantillon de gaz olfactivement actif, indépendamment de l'origine de l'échantillon lui-même) peut être pleinement appliquée dans de nombreux cas non liés aux sources d'émissions industrielles (par exemple, le mesurage de la concentration massique au seuil de détection de substances odorantes, la détermination de l'efficacité des systèmes de désodorisation de l'air intérieur). Dans ces derniers cas, les exigences du présent document concernant la planification des mesures et l'échantillonnage des sources fixes peuvent être ignorées ou adaptées.
Le domaine d'application du présent document concerne le mesurage de la concentration d'odeur du gaz odorant, de mélanges de substances odorantes d'une composition définie et de mélanges non définis de substances odorantes dans l'air ou l'azote, en utilisant l'olfactométrie dynamique avec un jury de sujets humains comme détecteurs. L'unité de mesure est l'unité d'odeur européenne par mètre cube, dont le symbole est : ouE/m3. La concentration d'odeur se mesure en déterminant le facteur de dilution requis pour atteindre le seuil de détection. La concentration d'odeur au seuil de détection est par définition de 1 ouE/m3. La concentration d'odeur s'exprime ensuite en termes de multiples du seuil de détection. L'étendue de mesure va en général de 101 ouE/m3 à 107 ouE/m3 (y compris la prédilution).
[...]
Emisije nepremičnih virov - Določevanje koncentracije vonjav z dinamično olfaktometrijo in stopnja emisije vonjav iz nepremičnih virov
Glavni namen uporabe tega standarda je zagotoviti skupno podlago za ocenjevanje emisij vonja.
Kadar se ta dokument uporablja za določanje koncentracije vonja ali stopnje emisij vonja pri emisijah iz stacionarnih virov, se uporabljajo drugi ustrezni evropski standardi v zvezi z emisijami iz stacionarnih virov, kot sta EN 15259 in EN 16911-1, zlasti kadar morajo biti meritve skladne z ustreznimi evropskimi direktivami o industrijskih emisijah v zrak.
Kljub temu se lahko faza analize/kvantifikacije v okviru metode merjenja, ki je opisana v tem dokumentu (tj. določanje koncentracije vonja v vzorcu plina z vonjem, ne glede na izvor samega vzorca), v celoti uporabi v številnih primerih, ki niso povezani z industrijskimi viri emisij (npr. merjenje masne koncentracije pri pragu zaznavanja čistih snovi z vonjem, določanje učinkovitosti dezodorirnih sistemov za zrak v zaprtih prostorih). V teh drugih primerih se lahko zahteve v tem dokumentu glede načrtovanja meritev in vzorčenja stacionarnih virov ne uporabijo ali prilagodijo.
Ta dokument se uporablja za merjenje koncentracije vonja čistih snovi, določenih spojin z vonjavami in nedoločenih zmesi hlapov z vonjavami v zraku ali dušiku z uporabo dinamične olfaktometrije s skupino človeških ocenjevalcev kot senzorjem. Merska enota je evropska enota vonja na kubični meter: ouE/m3. Koncentracija vonja se meri z določitvijo faktorja redčenja, ki je potreben za doseganje praga zaznave. Koncentracija vonja pri pragu zaznave je 1 ouE/m3. Koncentracija vonja se tako izrazi z mnogokratniki praga zaznavanja. Merilno območje je običajno od 101 ouE/m3 do 107 ouE/m3 (vključno s predhodnim redčenjem).
Področje uporabe tega dokumenta zajema:
– merjenje masne koncentracija pri pragu zaznavanja čistih snovi z vonjem v g/m3;
– določitev vrednosti EROM (evropska referenčna masa vonja) vonjav v molih;
– merjenje koncentracije zmesi vonjav pri pragu zaznavanja čistih snovi z vonjem v g/m3;
– merjenje stopnje emisij z vonjem iz točkastih virov, aktivnih območnih virov in pasivnih območnih virov, vključno s predhodnim redčenjem med vzorčenjem;
– vzorčenje plinov z vonjem iz emisij z visoko vlažnostjo in temperaturo (do 200 °C);
– določanje učinkovitosti tehnik za zmanjšanje končnih emisij, ki se uporabljajo za zmanjšanje emisij vonja.
Določanje emisij vonja zahteva merjenje hitrosti plina, da se določi prostorninski pretok plina.
Področje uporabe tega dokumenta ne zajema:
– merjenja vonja, ki ga potencialno sproščajo delci trdnih snovi z vonjem ali kapljice tekočin z vonjem, lebdeče v emisijah;
– strategija za merjenje, ki se uporabi v primeru spremenljivih stopenj emisij;
– merjenje razmerja med dražljajem vonja in odzivom ocenjevalca nad pragom zaznavanja (zaznana intenzivnost);
– merjenje hedonskega tona (ali (ne)prijetnosti) ali ocena potenciala za nadležnost;
– neposredno merjenje izpostavljenosti vonju v zunanjem zraku. Za ta namen merjenja obstajajo metode s skupinami na terenu, ki so obravnavane v standardu CEN EN 16841-1, Zunanji zrak – Določevanje vonja v zunanjem zraku s terenskim pregledom – Rastrska metoda;
– neposredna olfaktometrija, vključno z olfaktometrijo na terenu;
– statična olfaktometrija;
– merjenje pragov zaznave vonja;
– merjenje pragov identifikacije vonja.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 13725:2022
01-september-2022
Nadomešča:
SIST EN 13725:2003
SIST EN 13725:2003/AC:2006
Emisije nepremičnih virov - Določevanje koncentracije vonjav z dinamično
olfaktometrijo in stopnja emisije vonjav iz nepremičnih virov
Stationary source emissions - Determination of odour concentration by dynamic
olfactometry and odour emission rate
Emissionen aus stationären Quellen - Bestimmung der Geruchsstoffkonzentration durch
dynamische Olfaktometrie und die Geruchsstoffemissionsrate
Émissions de sources fixes - Détermination de la concentration d'odeur par olfactométrie
dynamique et du taux d'émission d'odeurs émanant de sources fixes
Ta slovenski standard je istoveten z: EN 13725:2022
ICS:
13.040.40 Emisije nepremičnih virov Stationary source emissions
SIST EN 13725:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 13725:2022
---------------------- Page: 2 ----------------------
SIST EN 13725:2022
EN 13725
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2022
EUROPÄISCHE NORM
ICS 13.040.99 Supersedes EN 13725:2003
English Version
Stationary source emissions - Determination of odour
concentration by dynamic olfactometry and odour
emission rate
Émissions de sources fixes - Détermination de la Emissionen aus stationären Quellen - Bestimmung der
concentration d'odeur par olfactométrie dynamique et Geruchsstoffkonzentration durch dynamische
du taux d'émission d'odeurs Olfaktometrie und die Geruchsstoffemissionsrate
This European Standard was approved by CEN on 12 December 2021.
This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 6 April 2022.
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. 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13725:2022 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
3.1 Terms and definitions for olfactometry . 7
3.2 Terms and definitions for sampling . 13
3.3 Terms and definitions for metrology and statistics . 16
4 Symbols and abbreviated terms . 22
5 Principle of method . 24
5.1 Odour measurement: odorant gas sampling and odour analysis . 24
5.2 Odorant gas sampling . 24
5.3 Determination of odour concentration . 25
6 Apparatus and materials . 28
6.1 General properties of materials . 28
6.2 Sampling equipment . 28
6.3 Sample container . 29
6.4 Gases . 30
6.5 Dilution apparatus . 31
6.6 Environment for observations by assessors. 33
6.7 Panel . 34
7 Performance characteristics and criteria . 36
7.1 General . 36
7.2 Accuracy - statistical model . 37
7.3 Overall sensory quality requirements . 37
7.4 Quality requirements for dilution apparatus . 40
8 Measurement objective and measurement plan . 44
8.1 General . 44
8.2 Preliminary investigation . 44
8.3 Measurement plan . 44
9 Measurement procedure . 45
9.1 Sampling . 45
9.2 Sampling of a point source . 50
9.3 Sampling of area sources . 50
9.4 Olfactometric analysis . 55
9.5 Occupational safety for sampling personnel, assessors and olfactometry operators . 57
9.6 Validation and calculation of results . 60
10 Quality assurance and quality control procedures . 62
10.1 Field blank . 62
10.2 Measurement uncertainty . 63
10.3 Determination of the limit of detection (LoD) and the limit of quantification (LoQ) . 69
11 Measurement records and report . 71
11.1 General . 71
11.2 Records and reporting for emission sampling . 71
2
---------------------- Page: 4 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
11.3 Records and reporting for odour concentration measurement . 72
Annex A (informative) Physiological principles . 74
Annex B (informative) Example of calculation of instrumental accuracy and instability . 78
Annex C (informative) Example of calculation of odour measurements within one laboratory. 81
Annex D (informative) Example of calculations for panel selection . 83
Annex E (informative) Example of the calculation of the odour concentration from a set of
panel member responses . 85
Annex F (informative) Example of the calculation used to determine the number of odour
concentration measurements required to achieve a defined precision . 89
Annex G (informative) Example of the calculation used to determine the number of odour
concentration measurements required to determine a difference between two means . 91
Annex H (informative) Example of the calculation of the odour flow rate (standard
conditions) for a wet emission . 94
Annex I (informative) Example of the calculation of an SROM value for a new defined
odorant from an EROM comparison . 95
Annex J (informative) Example of the calculation of measurement uncertainty . 105
Annex K (informative) Dynamic dilution apparatus for sampling . 113
Annex L (informative) Considerations for the interpretation of the odour concentration
concept for air quality management . 116
Annex M (informative) Sampling of passive area sources . 117
Annex N (informative) Significant technical changes . 119
Bibliography . 123
3
---------------------- Page: 5 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
European foreword
This document (EN 13725:2022) has been prepared by Technical Committee CEN/TC 264 “Air quality”,
the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by August 2022, and conflicting national standards shall be withdrawn
at the latest by August 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13725:2003. The methods defined in the first edition and its associated
quality criteria have been validated in numerous proficiency tests.
The main changes in this revision relative to the first edition EN 13725:2003 are listed in informative
Annex N.
Annexes A, B, C, D, E, F, G, H, I, J, K, L, M and N are all informative.
Any feedback and questions on this document should be directed to the users’ national standards body. A
complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus,
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
4
---------------------- Page: 6 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
1 Scope
This document specifies an objective method for the determination of the odour concentration of a gaseous
sample using dynamic olfactometry with human assessors. The document also specifies a method for the
determination of the odour emission rate from stationary sources, in particular:
a) point sources (conveyed or ducted emissions);
b) active area sources (e.g. biofilters).
The primary application of this document is to provide a common basis for evaluation of odour emissions.
When this document is used for the determination of the odour concentration or the odour emission rate
of stationary source emissions, the other relevant European Standards concerning stationary source
emissions apply, in particular EN 15259 and EN ISO 16911-1, especially when measurements have to
comply with the relevant European Directives concerning industrial air emissions.
Even so, the analysis/quantification step of the measurement method described in this document (i.e. the
determination of the odour concentration of an odorous gas sample, without respect to the origin of the
sample itself) may be fully applied in many cases not related with industrial emission sources (e.g. the
measurement of the mass concentration at the detection threshold of odorant substances, the
determination of effectiveness of deodorising systems for indoor air). In those latter cases, the
requirements in this document concerning the measurement planning and the sampling of stationary
sources may be ignored or adapted.
This document is applicable to the measurement of odour concentration of odorous gas, mixtures of
odorants of defined composition and undefined mixtures of odorants in air or nitrogen, using dynamic
olfactometry with a panel of human assessors being the sensor. The unit of measurement is the European
3
odour unit per cubic metre: ou /m . The odour concentration is measured by determining the dilution
E
factor required to reach the detection threshold. The odour concentration at the detection threshold is by
3
definition 1 ou /m . The odour concentration is then expressed in terms of multiples of the detection
E
1 3 7 3
threshold. The range of measurement is typically from 10 ou /m to 10 ou /m (including pre-dilution).
E E
The field of application of this document includes:
3
1) the measurement of the mass concentration at the detection threshold of odorants in g/m ;
2) the determination of the SROM value of secondary reference odorant gas, in mol;
3
3) the measurement of the odour concentration of mixtures of odorants in ou /m ;
E
4) the measurement of the odour emission rate from point sources and active area sources, including pre-
dilution during sampling;
5) the sampling of odorous gases from emissions of high humidity and temperature (up to 200 °C);
6) the determination of effectiveness of mitigation techniques used to reduce odour emissions.
The determination of odour emissions requires measurement of gas velocity to determine the volume
flow rate.
The field of application of this document does not include:
i. the measurement of odours potentially released by particles of odorous solids or droplets of odorous
fluids suspended in emissions;
ii. the measuring strategy to be applied in case of variable emission rates;
5
---------------------- Page: 7 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
iii. subjective methods for the sensory measurement of the relationship between odour stimulus and
assessor response above detection threshold (perceived intensity);
iv. subjective methods for the sensory measurement of hedonic tone (or (un)pleasantness) or assessment
of annoyance potential;
v. direct measurement of odour exposure in ambient air. For this measurement purpose field panel
methods exist which are the subject of EN 16841-1;
vi. direct olfactometry, including field olfactometry;
vii. static olfactometry;
viii. measurement of the odour identification (recognition) threshold;
ix. the determination of odour emission rate from volume sources, such as fugitive emissions from
buildings;
x. the determination of odour emission rate from passive area sources.
Although the ultimate application of odour concentration measurement is aimed at reducing odour
nuisance, the relation between emissions, dispersion, exposure and annoyance is not within the scope of
this document. The relation between measured odour concentrations and odour emissions according to
this standard and the occurrence of odour nuisance is highly complex. It is profoundly influenced by the
atmospheric processes determining the dispersion of odours, the quality of the odour (hedonic tone) and
finally by the receptor characteristics of those exposed to the odour. These receptor characteristics not
only vary strongly between individuals, but also in time within one individual.
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 15259:2007, Air quality — Measurement of stationary source emissions — Requirements for
measurement sections and sites and for the measurement objective, plan and report
EN ISO 16911-1, Stationary source emissions — Manual and automatic determination of velocity and volume
flow rate in ducts — Part 1: Manual reference method (ISO 16911-1)
EN ISO 20988:2007, Air quality — Guidelines for estimating measurement uncertainty (ISO 20988:2007)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org/
6
---------------------- Page: 8 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
The terms and definitions are categorized in:
1) terms and definitions for olfactometry;
2) terms and definitions for sampling;
3) term and definitions for metrology and statistics.
3.1 Terms and definitions for olfactometry
3.1.1
anosmia
lack of sensitivity to olfactory stimuli
[SOURCE: EN ISO 5492:2009, 2.32]
3.1.2
assessor
somebody who participates in odour testing
Note 1 to entry: See also 3.1.41.
3.1.3
delayed olfactometry
measurement of an odour concentration with a time-lag between sampling and analysis
Note 1 to entry: The odour sample is preserved in an appropriate container.
3.1.4
detection threshold
odorant concentration which has a probability of 0,5 of being detected under
the conditions of the test
3.1.5
detection threshold
dilution factor at which the odorant gas has a probability of 0,5 of being
detected under the conditions of the test
3.1.6
dilution factor
ratio between the flow rate or volume after dilution and the flow rate or volume of the odorous gas
3.1.7
dilution series
presentation of a sequence of dilutions to one assessor in order to obtain one Individual Threshold
Estimate
Note 1 to entry: See Figure 1.
3.1.8
direct olfactometry
on-line olfactometry
measurement of odour concentrations without any time-lag between the sampling (operation) and the
analysis
7
---------------------- Page: 9 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
3.1.9
dynamic dilution
dilution achieved by mixing two known flows of gas, odorous sample and neutral gas, respectively
Note 1 to entry: The dilution factor can be determined from the flow rates.
3.1.10
dynamic olfactometer
apparatus that delivers a flow of mixtures of odorous and neutral gas with known dilution factors in a
common outlet
3.1.11
dynamic olfactometry
olfactometry using a dynamic olfactometer
3.1.12
European odour unit
amount of odorant(s) that, when evaporated into one cubic metre of neutral gas at standard conditions,
elicits a physiological response from a panel (detection threshold) equivalent to that elicited by one
3
European Reference Odour Mass (EROM), evaporated in 1 m of neutral gas at standard conditions
3.1.13
European Reference Odour Mass
EROM
conventional quantity value for the European odour unit, equal to a defined mass of reference odorant
Note 1 to entry: The primary reference odorant is n-butanol (CAS-Nr. 71-36-3). The conventional quantity value
3
for 1 EROM is 123 μg n-butanol. Evaporated in 1 m of neutral gas this produces a concentration of 0,040 μmol/mol.
3.1.14
forced-choice method
procedure in which the response “no difference” is not permitted
[SOURCE: EN ISO 5492:2009/A1:2017, 4.58]
3.1.15
individual threshold
detection threshold applying to an individual
3.1.16
individual threshold estimate
ITE
detection threshold applying to an individual estimated on the basis of one dilution series
3.1.17
instrumental dilution range
range between the minimum and maximum dilution factors
3.1.18
intensity
magnitude of the perceived sensation
[SOURCE: EN ISO 5492:2009, 2.8]
8
---------------------- Page: 10 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
3.1.19
maximum dilution factor
highest settable dilution factor of the olfactometer
3.1.20
measurement report
report established by the testing laboratory according to the customer request and containing at least the
information required in the standards applied in the measurements programme, in particular this
document
[SOURCE: EN 15259:2007, 3.22]
3.1.21
measuring range
odour concentrations which can be measured by a specific olfactometer
Note 1 to entry: The theoretical measuring range depends on the minimum and maximum dilution factor and the
step factor. The numerical values defining the theoretical measuring range are the minimum dilution factor multiplied
with the step factor to the power 1,5 and the maximum dilution factor divided by the step factor to the power 1,5.
3.1.22
minimum dilution factor
lowest settable dilution factor of the olfactometer
3.1.23
neutral gas
odourless gas
air or nitrogen that is treated in such a way that it is as odourless as technically possible and that does,
according to panel members, not interfere with the odour under investigation
3.1.24
objective method
method in which the effects of personal opinions are minimized
[SOURCE: EN ISO 5492:2009, 4.1]
3.1.25
odorant
substance which, when volatilised in neutral gas, has the potential to stimulate the human olfactory system
so that an odour is perceived
3.1.26
odorant gas
gas that contains one or more odorants
3
Note 1 to entry: The odour concentration of a generic odorant gas can be greater or lower than 1 ou /m , i.e. the
E
odorants in the gas can or cannot cause an odour for human olfactory assessors.
3.1.27
odorous gas
3
odorant gas having an odour concentration greater than 1 ou /m
E
9
---------------------- Page: 11 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
3.1.28
odour
sensation perceived by means of the olfactory organ in sniffing certain volatile substances
[SOURCE: EN ISO 5492:2009, 3.18]
3.1.29
odour abatement efficiency
reduction of the odour flow rate due to an abatement technique, expressed as a fraction (or percentage) of
the odour flow rate of the untreated gas stream
Note 1 to entry: Reduction of the odour concentration does not imply a proportional reduction of the perceived
odour intensity.
3.1.30
odour concentration
number of European odour units in a cubic metre of gas at standard conditions for olfactometry
3.1.31
odour detection
awareness of the sensation resulting from adequate stimulation of the olfactory system
3.1.32
odour panel
panel
group of panel members
3.1.33
odour unit
amount of (a mixture of) odorants present in one cubic metre of odorant gas (under standard conditions
for olfactometry) at the panel threshold
Note 1 to entry: This definition is different from that of the European odour unit, in that only the latter is traceable
to a known odorant mass, defined as the EROM.
3.1.34
olfactometer
apparatus in which a sample of odorant gas is diluted with neutral gas in a defined ratio and presented to
assessors
3.1.35
olfactometric analysis of one odorous gas sample
odour concentration measurement
presentation to all panel members of those dilution series necessary to produce sufficient data to calculate
the odour concentration for one sample
Note 1 to entry: See Figure 1.
3.1.36
olfactometry
measurement of the odour concentration of an odorous gas sample by sensory analysis
Note 1 to entry: This definition is specific for use within the scope of this standard.
10
---------------------- Page: 12 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
3.1.37
olfactometry operator
person directly involved in operating the olfactometer and instructing the panel in olfactometry
3.1.38
olfactory
pertaining to the sense of smell
[SOURCE: EN ISO 5492:2009, 2.14]
3.1.39
olfactory receptor
specific part of the olfactory system which responds to one or several odorants
[SOURCE: EN ISO 5492:2009, 2.1, modified - general definition pertaining to sense organs adapted to be
specifically applicable to olfaction]
3.1.40
olfactory stimulus
that which excites an olfactory receptor
[SOURCE: EN ISO 5492:2009, 2.2, modified – general definition adapted to be specifically applicable to
olfaction]
3.1.41
panel member
assessor who is qualified to judge samples of odorous gas using dynamic olfactometry
3.1.42
panel screening
procedure to determine if the performance of panel members is in compliance with criteria
3.1.43
panel selection
procedure to determine which assessors are qualified as panel members
3.1.44
panel session
session with a series of odour concentration measurements on a day, interrupted by short breaks only,
with one panel composition
3.1.45
panel threshold
odour threshold
odour detection threshold applying to a panel
3.1.46
perception
awareness of the effects of single or multiple sensory stimuli
[SOURCE: EN ISO 5492:2009, 2.3]
11
---------------------- Page: 13 ----------------------
SIST EN 13725:2022
EN 13725:2022 (E)
3.1.47
presentation
presentation of one dilution to one assessor
Note 1 to entry: See Figure 1.
3.1.48
presentation series
presentation of one dilution to all assessors in one round
Note 1 to entry: See Figure 1.
3.1.49
presented gas flow
gas flow produced by the olfactometer and presented to the assessor
EXAMPLE 1 a diluted odorant gas sample
EXAMPLE 2 neutral gas
3.1.50
round
presentation of one dilution series to all assessors
Note 1 to entry: See Figure 1.
3.1.51
secondary reference odour mass
SROM
quantity value of mass of odorant with an olfactory stimulus quantity equivalent to the stimulus quantity
of the European Reference Odour Mass (EROM)
Note 1 to entry: For each odorant a specific SROM quantity, equivalent to the olfactory stimulus elicited by the
EROM, can be determined, according to the procedure in 5.3.2. If an SROM quantity has been established for an
odorant, it can serve as a secondary reference odorant gas.
3.1.52
sensory adaptation
temporary modification of the sensitivity of a sense organ due to continued and/or repeated stimulation
[SOURCE: EN ISO 5492:2009, 2.6]
3.1.53
se
...
SLOVENSKI STANDARD
oSIST prEN 13725:2019
01-junij-2019
[Not translated]
Stationary source emissions - Determination of odour concentration by dynamic
olfactometry and odour emission rate from stationary sources
Emissionen aus stationären Quellen - Dynamische Olfaktometrie zur Bestimmung von
Geruchskonzentrationen
Ta slovenski standard je istoveten z: prEN 13725
ICS:
13.040.40 Emisije nepremičnih virov Stationary source emissions
oSIST prEN 13725:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN 13725:2019
---------------------- Page: 2 ----------------------
oSIST prEN 13725:2019
DRAFT
EUROPEAN STANDARD
prEN 13725
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 13.040.99 Will supersede EN 13725:2003
English Version
Stationary source emissions - Determination of odour
concentration by dynamic olfactometry and odour
emission rate from stationary sources
Emissionen aus stationären Quellen - Dynamische
Olfaktometrie zur Bestimmung von
Geruchskonzentrationen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 264.
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-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey 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
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13725:2019 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
3.1 Terms and definitions for olfactometry . 8
3.2 Terms and definitions for sampling . 14
3.3 Terms and definitions for metrology and statistics . 17
4 Symbols and abbreviated terms . 22
5 Principle of method . 24
5.1 Odour measurement: odorant gas sampling and odour analysis . 24
5.2 Odorant gas sampling . 25
5.3 Determination of odour concentration . 25
6 Apparatus and materials . 28
6.1 General properties of materials . 28
6.2 Sampling equipment . 29
6.2.1 General . 29
6.2.2 Materials for sample equipment . 29
6.2.3 Cleaning and re-use of sampling equipment . 30
6.3 Sample container . 30
6.3.1 Materials for sample container (bags) . 30
6.3.2 Testing of sample containers . 30
6.3.3 Cleaning and re-use of sample containers . 31
6.4 Gases . 31
6.4.1 Neutral gas . 31
6.4.2 Primary reference material for the EROM: odorant (n-butanol) . 32
6.4.3 Reference material for calibration of dilution equipment. 32
6.5 Dilution apparatus . 32
6.5.1 Construction of the olfactometer. 32
6.5.2 Dilution range of olfactometer . 33
6.5.3 Interface between nose and olfactometer . 33
6.5.4 Calibration procedure . 34
6.6 Environment for observations by assessors . 34
6.6.1 Olfactometry room . 34
6.6.2 Air conditioning for the olfactometry room . 35
6.7 Panel . 36
6.7.1 Code of behaviour for assessors and panel members. 36
6.7.2 Selection of assessors on individual variability and sensitivity . 36
6.7.3 Monitoring of panel members of assessors on individual variability and sensitivity . 37
6.7.4 Panel size . 38
7 Performance and determination of the performance characteristics . 38
7.1 General . 38
7.2 Accuracy - statistical model . 39
7.3 Overall sensory quality requirements . 40
7.3.1 General . 40
2
---------------------- Page: 4 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
7.3.2 Quality criteria for the performance within one laboratory on reference material
(odorant) . 41
7.3.3 Assessment of precision between laboratories (reproducibility) using
environmental samples . 43
7.4 Quality requirements for dilution apparatus . 44
7.4.1 General . 44
7.4.2 Quality criteria for the performance of dilution apparatus . 44
7.4.3 Quality criterion for instability of dilution apparatus . 46
8 Measurement objective and measurement plan . 47
8.1 General . 47
8.2 Preliminary investigation . 47
8.3 Measurement plan. 48
9 Measurement procedure . 49
9.1 Sampling . 49
9.1.1 Health and safety issues during sampling . 49
9.1.2 Sample collection method . 49
9.1.3 Pre-dilution during sampling . 50
9.1.4 Transport and storage of odorant gas samples before analysis . 52
9.2 Sampling of a point source . 54
9.2.1 Sampling equipment . 54
9.3 Sampling of area sources . 55
9.3.1 Sampling of active area sources . 55
9.3.2 Sampling of passive area sources . 60
9.4 Olfactometric analysis . 62
9.4.1 Modes of presentation and choice . 62
9.4.2 Evaluation time and inter-stimulus time . 63
9.4.3 Number and order of presentations . 63
9.4.4 Initial determination of presentation series at the start of the measurement . 64
9.5 Occupational safety for sampling personnel, assessors and analysis operators . 64
9.5.1 General . 64
9.5.2 Toxicity . 65
9.5.3 The panel members . 66
9.5.4 The test leaders . 66
9.5.5 The sampling technicians . 66
9.6 Validation and calculation of results . 68
9.6.1 Calculation of odour concentration of a sample from a set of panel member
responses . 68
9.6.2 Calculation of odour flow from odour concentration and volume flow rate . 70
9.6.3 Calculation of odour abatement efficiency . 70
10 Quality assurance and quality control procedures . 70
10.1 Field blank . 70
10.2 Measurement uncertainty . 72
10.2.1 General . 72
10.2.2 Estimation of the within laboratory uncertainty . 73
10.3 Determination of the limit of detection (LoD) and the limit of quantification (LoQ) . 77
11 Measurement report . 79
Annex A (informative) Physiological principles . 82
Annex B (informative) Example of calculation of instrumental accuracy and instability . 87
Annex C (informative) Example of calculation of odour measurements within one
laboratory . 90
3
---------------------- Page: 5 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
Annex D (informative) Example of calculations for panel selection. 92
Annex E (informative) Example of the calculation of the odour concentration from a set of
panel member responses . 93
Annex F (informative) Example of the calculation used to determine the number of odour
concentration measurements required to achieve a defined precision . 97
Annex G (informative) Example of the calculation used to determine the number of odour
concentration measurements required to determine a difference between two
means . 99
Annex H (informative) Example of the calculation of the odour flow rate (standard
conditions) for a wet emission . 102
Annex I (informative) Example of the calculation of an EROM value for a new defined
odorant from an EROM comparison . 103
Annex J (informative) Example of the calculation of measurement uncertainty . 114
Annex K (informative) Significant technical changes . 122
Bibliography . 123
4
---------------------- Page: 6 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
European foreword
This document (prEN 13725:2019) has been prepared by Technical Committee CEN/TC 264 “Air quality”,
the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13725:2003.
This document is the first revised edition of the standard that was first published as EN 13725:2003. The
method defined in this first edition and its quality criteria have been validated in numerous proficiency
tests. This first revision contains modified and additional clauses on health and safety, sampling and
emissions measurement, the use of additional reference materials and the assessment of overall
uncertainty.
5
---------------------- Page: 7 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
1 Scope
This document specifies a method for the objective determination of the odour concentration of a gaseous
sample using dynamic olfactometry with human assessors. The standard also specifies a method for the
determination of the emission rate of odours from stationary sources, in particular:
— point sources (conveyed or ducted emissions);
— active area sources (e.g. biofilters);
— passive sources.
The primary application of this standard is to provide a common basis for evaluation of odour emissions.
When this document is used for the determination of the odour concentration or the odour emission rate
of stationary source emissions, the other relevant European Standards concerning stationary source
emissions apply, in particular EN 15259 and EN 16911-1, especially when measurements have to be in
compliance with the relevant European Directives concerning industrial air emissions.
Even so, the analysis/quantification step of the measurement method described in this document (i.e. the
determination of the odour concentration of an odorous gas sample, without respect to the origin of the
sample itself) can be fully applied in many cases not related with industrial emission sources (e.g. the
measurement of the mass concentration at the detection threshold of pure odorous substances, the
determination of effectiveness of deodorizing systems for indoor air). In those latter cases, the
requirements in this document concerning the measurement planning and the sampling of stationary
sources can be ignored or adapted.
This document is applicable to the measurement of odour concentration of pure substances, defined
odorant compounds and undefined mixtures of odorant volatiles in air or nitrogen, using dynamic
olfactometry with a panel of human assessors being the sensor. The unit of measurement is the European
3
odour unit per cubic metre: ou /m . The odour concentration is measured by determining the dilution
E
factor required to reach the detection threshold. The odour concentration at the detection threshold is
3
by definition 1 ou /m . The odour concentration is then expressed in terms of multiples of the detection
E
1 3 7 3
threshold. The range of measurement is typically from 10 ou /m to 10 ou /m (including pre-dilution).
E E
The field of application of this document includes:
— the measurement of the mass concentration at the detection threshold of pure odorous substances
3
in g/m ;
— the determination of the EROM value of odorants, in mol;
3
/m ;
— the measurement of the odour concentration of mixtures of odorants in ouE
— the measurement of the emission rate of odorous emissions from point sources, active area sources
and passive area sources, including pre-dilution during sampling;
— the sampling of odorous gases from emissions of high humidity and temperature (up to 200 °C);
— the determination of effectiveness of end-of-pipe mitigation techniques used to reduce odour
emissions.
The determination of odour emissions requires measurement of gas velocityto determine the gas volume
flow rate.
6
---------------------- Page: 8 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
The field of application of this document does not include:
— the measurement of odours potentially released by particles of odorous solids or droplets of odorous
fluids suspended in emissions;
— the measuring strategy to be applied in case of variable emission rates;
— the measurement of the relationship between odour stimulus and assessor response above detection
threshold (perceived intensity);
— measurement of hedonic tone (or (un)pleasantness) or assessment of annoyance potential;
— direct measurement of odour exposure in ambient air. For this measurement purpose, field panel
methods exist which are the subject of CEN standard EN 16841-1, Ambient Air - Determination of
odour in ambient air by using field inspection - Grid method;
— direct olfactometry, including field olfactometry;
— static olfactometry;
— measurement of odour recognition thresholds;
— measurement of odour identification thresholds.
Although the ultimate application of odour concentration measurement is aimed at reducing odour
nuisance, the relation between emissions, dispersion, exposure and annoyance is not within the scope of
this document. The relation between measured odour concentrations and odour emissions according to
this standard and the occurrence of odour nuisance is highly complex. It is profoundly influenced by the
atmospheric processes determining the dispersion of odours, the quality of the odour (hedonic tone) and
finally by the receptor characteristics of those exposed to the odour. These receptor characteristics not
only vary strongly between individuals, but also in time within one individual.
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 15259, Air quality — Measurement of stationary source emissions - Requirements for measurement
sections and sites and for the measurement objective, plan and report
EN ISO 16911-1, Stationary source emissions — Manual and automatic determination of velocity and
volume flow rate in ducts - Part 1: Manual reference method
EN ISO 20988:2007, Air quality — Guidelines for estimating measurement uncertainty
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
7
---------------------- Page: 9 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
— ISO Online browsing platform: available at https://www.iso.org/obp
The terms and definitions are categorized according to:
a) term and definitions for metrology and statistics;
b) terms and definitions for olfactometry;
c) terms and definitions for sampling.
3.1 Terms and definitions for olfactometry
3.1.1
anosmia
lack of sensitivity to olfactory stimuli
[SOURCE: EN ISO 5492:2008, 2.32]
3.1.2
assessor
somebody who participates in odour testing
3.1.3
delayed olfactometry
measurement of an odour with a time-lag between sampling and analysis
Note 1 to entry: The odour sample is preserved in an appropriate container.
3.1.4
detection threshold
odorant concentration which has a probability of 0,5 of being detected under
the conditions of the test
3.1.5
detection threshold
dilution factor at which the odorant gas has a probability of 0,5 of being
detected under the conditions of the test
3.1.6
dilution factor
ratio between flow or volume after dilution and the flow or volume of the odorous gas
3.1.7
dilution series
presentation of a sequence of dilutions to one panel member in order to obtain one Individual
Threshold Estimate
Note 1 to entry: See Figure 1.
Note 2 to entry: One dilution series can consist of: one series of presentations, at odour concentrations where,
when sorted in order of descending dilution factors, a significant change from FALSE responses to consistently
TRUE responses occurs (see Figure 1).
8
---------------------- Page: 10 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
3.1.8
direct olfactometry
on-line olfactometry
measurement of odour concentrations without any time-lag between the sampling (operation) and the
analysis
3.1.9
dynamic dilution
dilution achieved by mixing two known flows of gas, odorous sample and neutral gas, respectively
Note 1 to entry: The rate of dilution is calculated from the flow rates.
3.1.10
dynamic olfactometer
equipment that delivers a flow of mixtures of odorous and neutral gas with known dilution factors in a
common outlet
3.1.11
dynamic olfactometry
olfactometry using a dynamic olfactometer
3.1.12
European Odour unit
amount of odorant(s) that, when evaporated into one cubic metre of neutral gas at standard conditions,
elicits a physiological response from a panel (detection threshold) equivalent to that elicited by one
3
European Reference Odour Mass (EROM), evaporated in 1 m of neutral gas at standard conditions
3.1.13
European Reference Odour Mass
EROM
conventional quantity value for the European odour unit, equal to a defined mass of reference odorant
Note 1 to entry: The primary reference odorant is n-butanol (CAS-Nr. 71-36-3). The conventional quantity value
3
for 1 EROM is 123 µg n-butanol. Evaporated in 1 m of neutral gas this produces a concentration of 0,040 µmol/mol.
Note 2 to entry: For each odorant a specific quantity for the EROM can be determined, according to the procedure
in 5.3. If an EROM quantity has been established for an odorant, it can serve as a secondary reference odorant.
3.1.14
forced choice method
procedure in which the response “no difference” is not permitted
[EN 5492:2009/A1:2017, 4.58
3.1.15
group threshold
detection threshold applying to a group of assessors
3.1.16
identification threshold
recognition threshold
odour concentration which has a probability of 0,5 of being recognised under the conditions of the test
9
---------------------- Page: 11 ----------------------
oSIST prEN 13725:2019
prEN 13725:2019 (E)
3.1.17
individual threshold
detection threshold applying to an individual
3.1.18
individual threshold estimate
ITE
detection threshold applying to an individual estimated on the basis of one dilution series
3.1.19
instrumental dilution range
range between the minimum and maximum dilution factor
3.1.20
intensity
magnitude of the perceived sensation
[SOURCE: ISO 5492:2008,2.8]
3.1.21
maximum dilution factor
highest settable dilution factor of the olfactometer
3.1.22
measurement report
report established by the testing laboratory according to the customer request and containing at least
the information required in the standar
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.