SIST EN ISO 10121-2:2013
(Main)Test methods for assessing the performance of gas-phase air cleaning media and devices for general ventilation - Part 2: Gas phase air cleaning devices (GPACD) (ISO 10121-2:2013)
Test methods for assessing the performance of gas-phase air cleaning media and devices for general ventilation - Part 2: Gas phase air cleaning devices (GPACD) (ISO 10121-2:2013)
This part of ISO 10121 aims to provide an objective test method to estimate the performance of any full size gas filtration device (GPACD) for general filtration regardless of media or technique used in the device. In fact, the goal of this part of ISO 10121 is to avoid relating the test data to internal parameters altogether. The benefit with this approach is that customers of GPACDs will be able to concentrate on price/performance and suppliers will have access to a normative and objective test standard that will not require the release of proprietary information or reverse engineering of the product. To ensure objectivity for test equipment suppliers, no specific design of the test apparatus is specified. Instead requirements of apparatus properties and validation tests are specified. However, different design examples in present use are outlined. This part of ISO 10121 can also be used with technologies such as scrubbers, absorbers, non-sorptive devices or packed columns as long as they fit into the test apparatus, can be meaningfully judged by the test method and are intended for general ventilation applications, both residential and non residential. Nuclear and military applications are specifically excluded.
Methode zur Leistungsermittlung von Medien und Vorrichtungen zur Reinigung der Gasphase für die allgemeine Lüftung - Teil 2: Einrichtungen zur Reinigung der Gasphase (ISO 10121-2:2013)
Dieser Teil der Norm bietet ein sachgerechtes Prüfverfahren zur Bewertung der Betriebseigenschaften von großformatigen Einrichtungen zur Reinigung der Gasphase (GPACD) für allgemeine Filtration, unabhängig von den im Gerät verwendeten Medien oder angewendeten Verfahren. Mit diesem Teil von ISO 10121 soll vielmehr vermieden werden, die Prüfdaten gänzlich auf interne Parameter zu beziehen. Der Nutzen bei dieser Vorgehensweise ist, dass Anwender der GPACD in die Lage versetzt werden, sich auf Verhältnis von Preis/Leistung zu konzentrieren, und Lieferanten (Anbieter) Zugang zu einer normativen und objektiven Prüf-norm bekommen, die keine Freigabe von urheberrechtlich geschützten Informationen oder Rekonstruktionen des Produkts verlangt.
Damit die Sachlichkeit für Lieferanten von Prüfeinrichtungen sichergestellt ist, wird keine bestimmte konstruktive Ausführung der Prüfeinrichtung vorgegeben. Stattdessen sind Anforderungen an die Geräteeigenschaften und Validierungsprüfung festgelegt. Verschiedene Konstruktionsbeispiele von gegenwärtig eingesetzten Geräten werden beschrieben. Dieser Teil der ISO 10121 kann auch bei Verfahrens-techniken angewendet werden, z. B., sofern diese in die Prüfeinrichtung hineinpassen, für Gaswäscher, Absorber, nicht saugfähige Bauteile oder Füllkörpersäulen, die sich mit dem Prüfverfahren aussagekräftig beurteilen lassen und für die allgemeine Lüftung von Wohn- und Nichtwohngebäuden (gewerbliche und Verwaltungsgebäude) vorgesehen sind. Nukleare und militärische Anwendungen sind ausdrücklich aus-geschlossen.
Méthodes d'essai pour l'évaluation de la performance des médias et des dispositifs de filtration moléculaire pour la ventilation générale - Partie 2: Dispositifs de filtration moléculaire (GPACD) (ISO 10121-2:2013)
L'ISO 10121-2:2013 a pour objet de fournir une méthode d'essai objective permettant d'évaluer les performances de tout dispositif de filtration moléculaire (GPACD) de dimension normalisée pour la ventilation générale quels que soient les médias ou la technique utilisés dans le dispositif. L'ISO 10121-2:2013 a en fait pour objet d'éviter d'associer les données d'essai aux paramètres internes. L'avantage de cette approche est que la clientèle des GPACD est en mesure de se concentrer sur le prix/les performances et les fournisseurs ont accès à une norme d'essai normative et objective qui n'exige pas la diffusion de renseignements exclusifs d'intérêt commercial ou de rétro-ingénierie du produit.
Pour garantir l'objectivité des fournisseurs d'équipement d'essai, aucune conception spécifique des appareils d'essai n'est normative. En revanche, les exigences normatives des propriétés des appareils et des essais de validation sont spécifiées. Cependant, divers exemples de conceptions actuellement utilisées sont soulignés. L'ISO 10121-2:2013 peut être aussi utilisée avec des technologies telles que débourbeurs, absorbeurs, dispositifs de non-sorption ou laveurs à garnissage tant qu'elles s'adaptent à l'appareil d'essai, qu'elles peuvent être considérées significatives par la méthode d'essai et sont destinées aux applications de ventilation générale à la fois résidentielles et non résidentielles. Les applications nucléaires et militaires sont explicitement exclues.
Preskusna metoda za ocenjevanje zmogljivosti sredstev in naprav za čiščenje plinske faze za splošno prezračevanje - 2. del: Plinske naprave za čiščenje plinske faze (ISO 10121-2:2013)
Cilj tega dela standarda ISO 10121 je zagotoviti objektivno preskusno metodo za ocenjevanje zmogljivosti naprav za čiščenje plinske faze (GPACD) za splošno filtriranje, ne glede na medije ali tehnike, uporabljene v napravi. Pravzaprav je cilj tega dela standarda ISO 10121 preprečiti, da bi se podatki preskusa sploh povezovali z notranjimi parametri. Prednost tega pristopa je, da se bodo lahko kupci naprav za čiščenje plinske faze osredotočili na ceno/zmogljivost ter bodo dobavitelji imeli dostop do normativnega in objektivnega preskusnega standarda, pri katerem ne bosta potrebna izdaja lastniških informacij ali povratni inženiring proizvoda. Poseben model preskusne naprave ni določen, da se zagotovi objektivnost dobaviteljev preskusne opreme. Namesto tega so navedene zahteve za lastnosti naprave in potrjevanja. Kljub temu so orisani primeri različnih modelov, ki so trenutno v uporabi. Ta del standarda ISO 10121 je mogoče uporabljati s tehnologijami, kot so pralniki, absorberji, nesorptivne priprave ali nasute kolone, če se prilegajo v preskusno napravo, če jih je mogoče s preskusno metodo smiselno oceniti in če so predvidene za splošno uporabo pri prezračevanju v stanovanjskih in nestanovanjskih okoljih. Uporaba v jedrske in vojaške namene je izrecno izključena.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10121-2:2013
01-september-2013
3UHVNXVQDPHWRGD]DRFHQMHYDQMH]PRJOMLYRVWLVUHGVWHYLQQDSUDY]DþLãþHQMH
SOLQVNHID]H]DVSORãQRSUH]UDþHYDQMHGHO 3OLQVNHQDSUDYH]DþLãþHQMHSOLQVNH
ID]H ,62
Test methods for assessing the performance of gas-phase air cleaning media and
devices for general ventilation - Part 2: Gas phase air cleaning devices (GPACD) (ISO
10121-2:2013)
Methode zur Leistungsermittlung von Medien und Vorrichtungen zur Reinigung der
Gasphase für die allgemeine Lüftung - Teil 2: Einrichtungen zur Reinigung der Gasphase
(ISO 10121-2:2013)
Méthodes d'essai pour l'évaluation de la performance des médias et des dispositifs de
filtration moléculaire pour la ventilation générale - Partie 2: Dispositifs de filtration
moléculaire (GPACD) (ISO 10121-2:2013)
Ta slovenski standard je istoveten z: EN ISO 10121-2:2013
ICS:
91.140.30 3UH]UDþHYDOQLLQNOLPDWVNL Ventilation and air-
VLVWHPL conditioning
SIST EN ISO 10121-2:2013 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 10121-2:2013
---------------------- Page: 2 ----------------------
SIST EN ISO 10121-2:2013
EUROPEAN STANDARD
EN ISO 10121-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2013
ICS 91.140.30
English Version
Test methods for assessing the performance of gas-phase air
cleaning media and devices for general ventilation - Part 2: Gas-
phase air cleaning devices (GPACD) (ISO 10121-2:2013)
Méthodes d'essai pour l'évaluation de la performance des Methode zur Leistungsermittlung von Medien und
médias et des dispositifs de filtration moléculaire pour la Vorrichtungen zur Reinigung der Gasphase für die
ventilation générale - Partie 2: Dispositifs de filtration allgemeine Lüftung - Teil 2: Einrichtungen zur Reinigung
moléculaire (GPACD) (ISO 10121-2:2013) der Gasphase (ISO 10121-2:2013)
This European Standard was approved by CEN on 1 March 2013.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10121-2:2013: E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 10121-2:2013
EN ISO 10121-2:2013 (E)
Contents Page
Foreword .3
2
---------------------- Page: 4 ----------------------
SIST EN ISO 10121-2:2013
EN ISO 10121-2:2013 (E)
Foreword
This document (EN ISO 10121-2:2013) has been prepared by Technical Committee ISO/TC 142 “Cleaning
equipment for air and other gases” in collaboration with Technical Committee CEN/TC 195 “Air filters for
general air cleaning” the secretariat of which is held by UNI.
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 October 2013, and conflicting national standards shall be withdrawn at
the latest by October 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 10121-2:2013 has been approved by CEN as EN ISO 10121-2:2013 without any modification.
3
---------------------- Page: 5 ----------------------
SIST EN ISO 10121-2:2013
---------------------- Page: 6 ----------------------
SIST EN ISO 10121-2:2013
INTERNATIONAL ISO
STANDARD 10121-2
First edition
2013-04-01
Test methods for assessing the
performance of gas-phase air cleaning
media and devices for general
ventilation —
Part 2:
Gas-phase air cleaning devices (GPACD)
Méthodes d’essai pour l’évaluation de la performance des médias et
des dispositifs de filtration moléculaire pour la ventilation générale —
Partie 2: Dispositifs de filtration moléculaire (GPACD)
Reference number
ISO 10121-2:2013(E)
©
ISO 2013
---------------------- Page: 7 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 6
4.1 Symbols . 6
4.2 Abbreviated terms . 7
5 Testing of GPACDs . 8
5.1 General . 8
5.2 Test setup and normative section of test stand . 8
5.3 Raw data, sampling accuracy and normative generation parameters . 9
5.4 Test parameters selected between user and supplier .10
5.5 Simplified benchmark setup .11
6 Test sequence .13
6.1 General .13
6.2 Conditioning and pressure drop determination .13
6.3 Initial removal efficiency .14
6.4 Capacity determination .16
6.5 Retentivity determination .19
7 Validation of test setup .20
7.1 General .20
7.2 Determination of rise time and decay time .20
8 Evaluation and report .22
8.1 Test report introduction .22
8.2 Test report example .23
9 Safety features .27
Annex A (normative) Test equipment requirements, equipment validation and
routine operation .28
Annex B (informative) Challenge gases, generation sources and analysis techniques .31
Annex C (informative) Test equipment designs .36
Bibliography .39
© ISO 2013 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10121-2 was prepared by Technical Committee ISO/TC 142, Cleaning equipment for air and other gases.
ISO 10121 consists of the following parts, under the general title Test methods for assessing the
performance of gas-phase air cleaning media and devices for general ventilation:
— Part 1: Gas-phase air cleaning media (GPACM)
— Part 2: Gas-phase air cleaning devices (GPACD)
iv © ISO 2013 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
Introduction
There is an increasing use and need for gas-phase filtration in general filtration applications. This demand
can be expected to increase rapidly due to the increasing pollution problems in the world together with
an increasing awareness that solutions to the problems are available in the form of filtration devices or,
phrased more technically, gas-phase air cleaning devices (GPACD). The performance of devices relies
to a large extent on the performance of a gas-phase air cleaning media (GPACM) incorporated in the
device. Still applications and device performance are often poorly understood by the users and suppliers
of such media and devices. Media tests may also be adequate to offer data for real applications if actual
low concentrations (< 100 ppb) and longer exposure times (>weeks) can be used in the test, provided
that the geometrical configuration, packing density and flow conditions of the small-scale test specimen
are equal to those used in the real applications. Such tests are however not included in the scope of
ISO 10121. ISO 10121 attempts to increase understanding and communication by supplying a more
standardized interface between media suppliers, device suppliers and end users. At present, standards
[1] [4]
exist for general ventilation in Japan by JIS, automotive filters by ISO , in-duct sorptive media gas-
[7] [8] [9]
phase air-cleaning devices by ASHRAE and for adsorptive media by ASHRAE and ASTM . No
international standard for general filtration exists today.
This part of ISO 10121 prescribes methods, test equipment, data interpretation and reporting for gas-
phase air cleaning devices intended for the removal of gas-phase contamination from air in general
ventilation applications.
In addition, information is given in a number of annexes:
— Annex A describes the normative validation procedure in detail in a tabulated form.
— Annex B gives a list of possible test gases, generation sources and suggests suitable analysis
equipment for common test gases in addition to reference techniques given for the simplified
benchmark setup in Clause 5.5.
— Annex C discusses different test stand designs.
A general introduction to molecular filtration and molecular filtration testing can be found in the
scientific literature.
ISO 10121 aims to provide laboratory test methods for media and devices which are used for removal of
gas-phase contaminants from air in general ventilation. It consists of two parts:
— ISO 10121-1 covers three different media configurations and is targeted towards giving a
standardized interface between media suppliers and producers of air cleaning devices. It may also
be used between media suppliers and end customers with regards to loose fill media properties.
— This part of ISO 10121 aims to give a standardized interface between suppliers of air cleaning
devices and end customers seeking the most cost efficient way to employ gas-phase filtration.
© ISO 2013 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 10121-2:2013
---------------------- Page: 12 ----------------------
SIST EN ISO 10121-2:2013
INTERNATIONAL STANDARD ISO 10121-2:2013(E)
Test methods for assessing the performance of gas-phase
air cleaning media and devices for general ventilation —
Part 2:
Gas-phase air cleaning devices (GPACD)
1 Scope
This part of ISO 10121 aims to provide an objective test method to estimate the performance of any
full size gas filtration device (GPACD) for general filtration regardless of media or technique used in the
device. In fact, the goal of this part of ISO 10121 is to avoid relating the test data to internal parameters
altogether. The benefit with this approach is that customers of GPACDs will be able to concentrate on
price/performance and suppliers will have access to a normative and objective test standard that will
not require the release of proprietary information or reverse engineering of the product.
To ensure objectivity for test equipment suppliers, no specific design of the test apparatus is specified.
Instead requirements of apparatus properties and validation tests are specified. However, different design
examples in present use are outlined. This part of ISO 10121 can also be used with technologies such as
scrubbers, absorbers, non-sorptive devices or packed columns as long as they fit into the test apparatus,
can be meaningfully judged by the test method and are intended for general ventilation applications, both
residential and non residential. Nuclear and military applications are specifically excluded.
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.
ISO 29464:2011, Cleaning equipment for air and other gases — Terminology
EN 15805:2009, Particulate air filters for general ventilation — Standardised dimensions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 29464 and the followings apply.
3.1
absorption
transport and dissolution of a sorbate into an absorbent
3.2
adsorbate
molecular compound in gaseous or vapour phase that will be retained by the adsorbent material of the media
3.3
adsorbent
material that collects adsorbates on its surface through physical or chemical processes
3.4
adsorption
process in which the molecules of a gas adhere by physical or chemical processes to the exposed surfaces
of solid substances, both the outer surface and inner pore surface, with which they come into contact
© ISO 2013 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
3.5
breakthrough
amount of gaseous contaminant in the effluent of a GPACD
Note 1 to entry: See “penetration”.
3.6
breakthrough vs. time curve
plot of contaminant penetration versus time for a particular challenge concentration and airflow
[Source: ISO 29464:2011; 3.2.67]
3.7
bypass
proportion of the challenge air stream that passes around the GPACD without contacting the media
[Source: ISO 29464:2011; 3.2.64]
3.8
capacity
m
s
amount (mass or moles) of a selected sorbate that can be contained in the filter media of a GPACD at
given test conditions, and a specific end point
Note 1 to entry: Capacity can also be negative during desorption.
3.9
challenge concentration
concentration of the test contaminant(s) of interest in the air stream prior to filtration
cf. challenge air stream
3.10
challenge compound
chemical compound that is being used as the contaminant of interest for any given test
3.11
challenge air stream
test contaminant(s) of interest diluted to the specified concentration(s) of the test prior to filtration
[Source: ISO 29464:2011; 3.2.16]
3.12
channeling
disproportionate or uneven flow of gas through passages of lower resistance due to inconsistencies in
the design or production of a GPACD, particularly in packed granular beds
[Source: ISO 29464:2011; 3.2.17]
3.13
chemisorption
chemical adsorption
trapping of gaseous or vapour contaminants on an adsorbent involving chemical reaction on the
adsorbent surface
[Source: ISO 29464:2011; 3.2.19]
3.14
concentration
C
n
quantity of one substance dispersed in a defined amount of another
Note 1 to entry: Indices “n” denote location.
2 © ISO 2013 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
[Source: ISO 29464:2011; 3.2.21]
3.15
contaminant
substance (solid, liquid, or gas) that negatively affects the intended use of a fluid
[Source: ISO 29464:2011; 3.2.23]
3.16
decay time
t
Dn
time required for the gas contaminant monitoring instrument to record a reduction from greater than
95 % of the challenge concentration to less than 5 % of the challenge concentration (t – t ) at the
END VC
downstream sampling point for a specific test (n), challenge gas and gas flow after stopping the injection
of the contaminant with no GPACD present
3.17
desorption
process in which adsorbate molecules leave the surface of the adsorbent and re-enter the air stream
Note 1 to entry: Desorption is the oppsite of adsorption.
3.18
downstream
area following the filter in the direction of fluid flow
3.19
efficiency vs. time curve
plot of the GPACD removal efficiency against time over the duration of a challenge test for a particular
challenge concentration and airflow
[Source: ISO 29464:2011; 3.2.31]
3.20
efficiency vs. capacity curve
plot of the GPACD removal efficiency against the integrated capacity over the duration of a challenge test
for a particular challenge concentration and airflow
[Source: ISO 29464:2011; 3.2.28]
3.21
face velocity
air flow rate divided by the cross sectional area of the GPACD
3.22
gas
substance whose vapour pressure is greater than the ambient pressure at ambient temperature
[Source: ISO 29464:2011; 3.2.44]
3.23
gas-phase air cleaning device
GPACD
assembly of a fixed size enabling the removal of specific gas- or vapour-phase contaminants
Note 1 to entry: It is normally box shaped or fits into a box of dimensions between 300 × 300 × 300 mm up to
approximately 610 × 610 × 610 mm or 2 × 2 × 2 feet.
[Source: ISO 29464:2011; 3.2.45, modified – NOTE has been modified.]
© ISO 2013 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
3.24
GPACD face area
cross-sectional area of the GPACD also including a header frame if so equipped when viewed from the
direction of air flow using exact dimensions
3.25
gas-phase air cleaning media
GPACM
media or media configuration used for filtering a contaminant
EXAMPLE a porous film or fibrous layer; a bead shaped, granular or pelletized adsorbent (or chemisorbent); a
support structure of fabric, foam or monoliths containing adsorbent in the form of small sized particles, granules,
spheres or powder; a woven or nonwoven fabric completely made from an adsorbent material
3.26
initial efficiency
efficiency of an unexposed filter or GPACD calculated as soon after the start of a test as is possible
Note 1 to entry: For gas-phase, this should be calculated as soon as a steady reading can be obtained.
3.27
molecular contamination
contamination present in gas or vapour phase in an air stream and excluding compounds in particulate
(solid) phase regardless of their chemical nature
3.28
ppb(v)
parts per billion by volume
concentration measure normally used to record ambient levels of outdoor pollution
3 3
Note 1 to entry: Units are mm /m .
3.29
ppm(v)
parts per million by volume
concentration measure normally used to record pollution levels in, for example, work place safety
3 3 3
Note 1 to entry: Units are cm /m and ml/m .
3.30
penetration
P
ratio of contaminant concentration downstream of the filter to the upstream (challenge) concentration,
sometimes expressed as a percentage
Note 1 to entry: Related to efficiency (E) by the expression: E = (1 – P) × 100 %.
[Source: ISO 29464:2011; 3.2.51]
3.31
physisorption
physical adsorption
attraction of an adsorbate to the surface, both outer surface and inner pore surface, of an adsorbent by
physical forces (Van der Waals forces)
[Source: ISO 29464:2011; 3.2.52]
4 © ISO 2013 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
3.32
pore
minute passageways through which fluid may pass or that expose to the fluid stream the internal
surfaces of an adsorbent media
[Source: ISO 29464:2011; 3.2.55]
3.33
pressure drop
Δp
difference in pressure between two points in an airflow system at specified conditions, especially when
measured across a GPACD
3.34
removal efficiency
E
fraction or percentage of a challenge contaminant that is removed by a GPACD at a given time
3.35
retentivity
m
r
measure of the ability of an adsorbent or GPACD to resist desorption of an adsorbate
Note 1 to entry: Computed as the residual capacity (fraction remaining) after purging the adsorbent with clean,
conditioned air only, following challenge breakthrough.
[Source: ISO 29464:2011; 3.2.61, modified – NOTE has been added]
3.36
residence time
t
r
relative time that an increment of fluid (or contaminant) is within the boundaries of the media volume
(e.g. a bed of granules or a non-woven sheet)
Note 1 to entry: In typical use and in this part of ISO 10121, this value neglects the fact that the media and possible
support structures occupy a significant portion of the volume of the bed [t = V (total bed volume) /Q (air flow rate)].
R
[Source: ISO 29464:2011; 3.2.71]
3.37
rise time
t
Rn
time between initial injection of contaminant and reaching 95 % of the challenge concentration for an
empty duct (t – t ) measured at the downstream sampling location for a specific test (n), challenge
0 VO
gas and gas flow
3.38
sorbate
molecular compounds that are retained in the adsorbent of the device
Note 1 to entry: The sorbate will refer to both intended compounds like the selected challenge gas in a test or
pollution in real service but also any other compound present in the air stream e.g. gases and vapours.
3.39
sorption
process in which fluid molecules (gas or liquid) are removed by a GPACD media by absorption or adsorption
© ISO 2013 – All rights reserved 5
---------------------- Page: 17 ----------------------
SIST EN ISO 10121-2:2013
ISO 10121-2:2013(E)
3.40
vapour
substance whose vapour pressure is less than the ambient pressure at ambient temperature, but is
present in the gas phase through evaporation or sublimation
[Source: ISO 29464:2011; 3.2.74]
4 Symbols and abbreviated terms
4.1 Symbols
C upstream concentration [ppb, ppm] measured at a position X mm before the device
U
C downstream concentration [ppb, ppm] measured at a position Y mm after the device
D
Δp pressure drop measured over the tested device [Pa]
E initial removal efficiency [%] for the device measured at a low (< 1 ppm) challenge concen-
I
tration during the initial efficiency test in 6.3
E removal efficiency [%] for the device measured at the challenge concentration selected
C
during the capacity test in 6.4
E efficiency recorded at stop test time or value agreed between user and supplier [%]
END
m retentivity [g],[mol]; the amount withheld by the device after ventilating with clean air at
r
the same flow selected during the capacity test until C reaches a specified value close to
D
zero.
m the integrated amount in moles or grams of challenge compound accumulated during the
sEI
initial efficiency test in Formula (2)
m the integrated amount in moles or gram of challenge compound accumulated during meas-
sU
urement at the upstream position in Formula (3)
m the integrated amount in moles or grams of challenge compound accumulated during
sD
measurement at the downstream position in Formula (3)
m the total integrated amount [g], [mol] of challenge compound accumulated
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.