kSIST FprEN 16589-1:2022

Laboratory local exhaust devices - Part 1: Articulated extraction arm

This document applies to an articulated extraction arm used as a local exhaust device in laboratories and comprised of a capture device (receiving, enclosing or capture hood, nozzle or flat screen) connected to an extraction arm which is articulated ducting to move air from the capture device to discharge.
This standard specifies:
- a method for type testing;
- a method to assess the three-dimensional capture zone of local exhaust devices mounted on an articulated extract arm;
- a method for assessing the emission release capture efficiency of local exhaust devices connected to an articulated extract arm and its robustness to a challenge of air disturbance directly in front of and in close proximity to the capture hood and release source;
- a method for establishing the reachable, three-dimensional workspace of local exhaust devices mounted on an articulated extract arm by measuring the possible positions of the opening of the device;
- a method for measuring the pressure drop and noise level in the type test;
- instructions for marking the device and recommended content of information for use;
- guidance for use describing the limitations of local exhaust devices with articulated extract arm for different airflow rates establishing the capture zone;
- guidance on selection, installation, commissioning, and control testing of articulated extract arms and their local exhaust ventilation systems.
The scope does not include filtration requirements and impact of fully or partly recirculation of the airflow extracted by an articulated extract arm.

Lokale Absaugeinrichtungen im Labor - Teil 1: Absaugarme mit Gelenken

Dieses Dokument gilt für Gelenkabsaugarme, die als lokale Absaugvorrichtungen in Laboratorien verwendet werden und die aus einer speziellen Erfassungsvorrichtung (Haube, Stutzen oder Flachschirm zum Aufnehmen, Umschließen oder Erfassen) bestehen, die mit einem spezifischen Absaugarm in Form einer Gelenkabluftleitung für den Transport der Luft von der Erfassungsvorrichtung zum Luftaustritt verbunden ist.
Dieses Dokument legt Folgendes fest:
— ein Verfahren für die Baumusterprüfung;
— ein Verfahren zur Beurteilung des dreidimensionalen Erfassungsbereichs von an einem Gelenk-absaugarm montierten lokalen Erfassungsvorrichtungen;
— ein Verfahren zur Beurteilung des Erfassungsgrads von an einen Gelenkabsaugarm angeschlossenen lokalen Erfassungsvorrichtungen bei isothermer Emission mit geringer Energie sowie zur Beurteilung der Robustheit dieser Vorrichtungen gegenüber Luftwirbeln direkt vor und in der unmittelbaren Umgebung der Erfassungshaube bei auf einem Tisch positionierter Emissionsquelle;
— ein Verfahren zur Ermittlung des dreidimensionalen Arbeitsbereichs, der von an einem Gelenkabsaugarm montierten lokalen Erfassungsvorrichtungen erreichbar ist, durch Messung der möglichen Positionen der Öffnung der Vorrichtung;
— ein Verfahren zur Messung des Druckverlusts und des Geräuschpegels bei der Baumusterprüfung und bei der Inbetriebnahme vor Ort;
— Anweisungen für die Kennzeichnung der Vorrichtung und Empfehlungen hinsichtlich der Benutzer-informationen im Produkthandbuch;
— Anwendungsleitlinien, in denen die Beschränkungen lokaler Erfassungsvorrichtungen mit Gelenkabsaugarm für verschiedene Luftvolumenströme mit Festlegung des Erfassungsbereichs beschrieben werden;
— Leitlinien für die Auswahl, Montage, Inbetriebnahme und Prüfung von Gelenkabsaugarmen und ihren lokalen Absaugsystemen.
Die Norm deckt nur Verfahren zur Produktleistungsprüfung ab. Die Norm enthält keine Verfahren für die Bewertung des Arbeitsschutzes.
Punktquellen mit einer auf die Temperatur, eine Druckentlastung, den Arbeitsablauf oder Ähnliches zurückzuführenden Anfangsgeschwindigkeit werden in dieser Norm nicht behandelt.
Nicht zum Anwendungsbereich gehören Anforderungen an die Filterung und die Auswirkungen einer vollständigen oder teilweisen Rückführung der von einem Gelenkabsaugarm abgesaugten Luft.

Dispositifs d'aspiration locale de laboratoire - Partie 1 : Bras articulé d'extraction

Le présent document s'applique à un bras articulé d'extraction utilisé en tant que dispositif d'aspiration locale de laboratoire et se composant d'un dispositif de captage spécifique (hotte de réception, d'enceinte ou de captage, tuyère ou écran plat) relié à un bras d'extraction spécifique composé d'un ensemble de conduits articulés servant à déplacer l'air du dispositif de captage à un point de rejet.
La présente norme spécifie :
 une méthode pour les essais de type ;
 une méthode pour évaluer la zone de captage tridimensionnelle des dispositifs d'aspiration locale montés sur un bras articulé d'extraction ;
 une méthode pour évaluer l'efficacité de captage des émissions libérées, dans des conditions isothermes et de faible énergie, de dispositifs d'aspiration locale reliés à un bras articulé d'extraction, et sa robustesse vis-à-vis d'une perturbation de l'air juste devant la hotte de captage et la source de libération positionnée sur une table et à proximité étroite de celles-ci ;
 une méthode pour établir l'espace de travail tridimensionnel accessible de dispositifs d'aspiration locale montés sur un bras articulé d'extraction par mesure des positions possibles de l'ouverture du dispositif ;
 une méthode pour mesurer la perte de charge et le niveau de bruit dans l'essai de type et lors de la mise en service sur site ;
 des instructions pour le marquage du dispositif et des informations recommandées à communiquer aux utilisateurs dans le manuel du produit ;
 des recommandations pour l'utilisation décrivant les limitations des dispositifs d'aspiration locale à bras articulé d'extraction pour différents débits d'air établissant la zone de captage ;
 des recommandations sur la sélection, l'installation, la mise en service et les essais des bras articulés d'extraction et leurs systèmes de ventilation à aspiration locale.
La norme ne couvre que les méthodes d'essai portant sur la performance des produits. La présente norme ne porte pas sur les méthodes d'évaluation de la santé et de la sécurité au travail.
Les sources ponctuelles avec vitesse initiale dues à la température, à la libération de pression, au processus de travail ou similaires ne sont pas couvertes par la présente norme.
Le domaine d'application ne comprend pas les exigences de filtration et l'impact d'un flux d'air extrait par un bras articulé d'extraction entièrement ou partiellement remis en circulation.

Laboratorijske lokalne odsesovalne naprave - 1. del: Členkasta izvlečna roka

General Information

• Status: Not Published
• Public Enquiry End Date: 08-Sep-2021
• ICS: 71.040.10 - Chemical laboratories. Laboratory equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Jan-2023
• Due Date: 11-Mar-2023
• Ref Project: EN 16589-1:2022 - Laboratory local exhaust devices - Part 1: General requirements and type test methods for articulated extraction arms

Relations

• Revised: SIST-TP CEN/TR 16589:2014 - Laboratory installations - Capture devices with articulated extract arm
• Effective Date: 10-Jun-2020
• Replaces: SIST-TP CEN/TR 16589:2014 - Laboratory installations - Capture devices with articulated extract arm
• Effective Date: 28-Dec-2022

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 16589-1:2021
01-september-2021
Laboratorijske lokalne odsesovalne naprave - 1. del: Členkasta izvlečna roka
Laboratory local exhaust devices - Part 1: Articulated extraction arm
Lokale Absaugeinrichtungen im Labor - Teil 1: Absaugarme mit Gelenken

Dispositifs d'aspiration locale de laboratoire - Partie 1 : Bras articulé d'extraction

Ta slovenski standard je istoveten z: prEN 16589-1
ICS:
71.040.10 Kemijski laboratoriji. Chemical laboratories.
Laboratorijska oprema Laboratory equipment
oSIST prEN 16589-1:2021 en,fr,de

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

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oSIST prEN 16589-1:2021
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oSIST prEN 16589-1:2021
DRAFT
EUROPEAN STANDARD
prEN 16589-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2021
ICS 71.040.10 Will supersede CEN/TR 16589:2013
English Version
Laboratory local exhaust devices - Part 1: Articulated
extraction arm

Dispositifs d'aspiration locale de laboratoire - Partie 1 : Lokale Absaugeinrichtungen im Labor - Teil 1:

Bras articulé d'extraction Absaugarme mit Gelenken

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 332.

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, 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.

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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16589-1:2021 E

worldwide for CEN national Members.
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Contents Page

European foreword ............................................................................................................................................ 3

1 Scope .......................................................................................................................................................... 5

2 Normative references .......................................................................................................................... 6

3 Terms and definitions ......................................................................................................................... 6

4 Test room and general test conditions ....................................................................................... 10

4.1 Dimension and construction of the test room .......................................................................... 10

4.2 Test room conditions ......................................................................................................................... 10

4.3 Articulated extract arm installation ............................................................................................ 10

4.4 Test conditions .................................................................................................................................... 10

4.4.1 General.................................................................................................................................................... 10

4.4.2 Setting extract air volume flow rate ............................................................................................. 10

5 Type test methods .............................................................................................................................. 11

5.1 General.................................................................................................................................................... 11

5.2 Capture zone measurement ............................................................................................................ 11

5.2.1 General.................................................................................................................................................... 11

5.2.2 Test Equipment.................................................................................................................................... 11

5.2.3 Test Principle ....................................................................................................................................... 11

5.2.4 Test procedure ..................................................................................................................................... 12

5.3 Capture efficiency and robustness test ....................................................................................... 13

5.3.1 Test equipment .................................................................................................................................... 13

5.3.2 Test principle ....................................................................................................................................... 13

5.3.3 Test method .......................................................................................................................................... 14

5.3.4 Test procedure ..................................................................................................................................... 14

5.3.5 Data analysis and results ................................................................................................................. 16

6 Technical performance ..................................................................................................................... 17

6.1 General.................................................................................................................................................... 17

6.2 Pressure measurement..................................................................................................................... 18

6.3 Sound pressure level ......................................................................................................................... 18

6.4 Sound power level .............................................................................................................................. 18

6.5 Reachable workspace ........................................................................................................................ 18

7 Alarms and indicators ....................................................................................................................... 18

7.1 Airflow alarms ..................................................................................................................................... 18

7.2 Capture zone indicator ..................................................................................................................... 18

7.3 Airflow control ..................................................................................................................................... 19

8 Marking and labelling ....................................................................................................................... 19

9 Product manual ................................................................................................................................... 19

10 Test report ............................................................................................................................................. 21

Annex A (informative) Guidance on selection and use of AEA’s...................................................... 22

Annex B (informative) Recommendations for commissioning and validation on-site .......... 28

Bibliography ....................................................................................................................................................... 29

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European foreword

This document (prEN 16589-1:2021) has been prepared by Technical Committee CEN/TC 332

“Laboratory equipment”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede CEN/TR 16589:2013.
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Introduction

Articulated extraction arms are local exhaust devices consisting of capture devices that may be

constructed in a variety of geometric shapes (hoods, nozzles, flat screens etc.) which are connected to or

mounted on extraction arms or arms with flexible joints. They are used for a variety of different

applications in the laboratory where contaminants are encountered. The design of articulated extract

arms for laboratories may differ for different applications.

The ability of capture devices to capture contaminants is subject to a number of factors. These factors are

extract volume flow, capture velocity, capture hood design, manoeuvrability, position in relation to

emission source, user activity, air speed etc. The capture ability is rapidly decreased with increased

distance to the emission source. Higher air velocity in the opening of the device improves the capture

ability but commonly results in increased noise level and pressure drop of the capture device and extract

arm.

Good information to the user on how to use the device as well as information about the limitations of the

device are essential for safety and health in the laboratories.

The performance values specified in this standard for type testing are considered appropriate to

determine the products compliance with the standard. Performance values on site may vary due to local

conditions and should be assessed as part of a specific risk assessment.

Articulated extract arms are useful for very small emission sources or when the emission source is too

large to reasonably be enclosed and has distinct points where the pollution might occur like a HPLC (High

pressure liquid chromatograph).
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1 Scope

This document applies to an articulated extraction arm used as a local exhaust device in laboratories and

comprised of a specific capture device (receiving, enclosing or capture hood, nozzle or flat screen)

connected to a specific extraction arm which is articulated ducting to move air from the capture device

to discharge.
This document specifies:
• a method for type testing;

• a method to assess the three-dimensional capture zone of local exhaust devices mounted on an

articulated extract arm;

• a method for assessing the isothermal and low energy emission release capture efficiency of local

exhaust devices connected to an articulated extract arm and its robustness to a challenge of air

disturbance directly in front of and in close proximity to the capture hood and release source

positioned on a table;

• a method for establishing the reachable, three-dimensional workspace of local exhaust devices

mounted on an articulated extract arm by measuring the possible positions of the opening of the

device;

• a method for measuring the pressure drop and noise level in the type test and at onsite

commissioning;

• instructions for marking the device and recommended information to transfer to users in the product

manual;

• guidance for use describing the limitations of local exhaust devices with articulated extract arm for

different airflow rates establishing the capture zone;

• guidance on selection, installation, commissioning, and testing of articulated extract arms and their

local exhaust ventilation systems.

The standard covers only product performance test methods. Occupational health and safety assessments

methods are not included in this standard.

Point sources with initial velocity due to temperature, pressure release, work process or similar are not

covered by this standard.

The scope does not include filtration requirements and impact of fully or partly recirculated airflow

extracted by an articulated extract arm.
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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 1093-4, Safety of machinery — Evaluation of the emission of airborne hazardous substances — Part 4:

Capture efficiency of an exhaust system — Tracer method
EN 14175-1, Fume cupboards - Part 1: Vocabulary

EN ISO 11204, Acoustics - Noise emitted by machinery and equipment - Determination of emission sound

pressure levels at a work station and at other specified positions applying accurate environmental

corrections (ISO 11204)
3 Terms and definitions

For the purposes of this document, EN 14175-1 and the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
capture device

equipment designed to capture or collect air pollutants at source connected directly to a duct or mounted

on an extraction arm

Note 1 to entry: Examples of capture devices are e.g. hood, flat screen, suction nozzle.

3.2
extraction arm

fixed, flexible or articulated ducting connecting the capture device with the main extract air duct

3.3
articulated extraction arm
AEA
articulated extract ducting assembly including capture device

Note 1 to entry: The articulated extraction arm can be moved and positioned so that the capture zone of the hood

is located at the identified hazard release zone. See examples in Figure 1.
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Key
ν schematic capture zone
centre point of entry surface
duct of capture device
duct connecting to main duct
1 main duct
2 articulated extraction arms
3 entry surface
4 capture device
Figure 1 — Example of common designs of capture devices and extraction arms
3.4
capture zone

three-dimensional space in front of the entry surface of a capture device in which the air velocity is

greater than or equal to the minimum air velocity required for effective capture of pollutants

3.5
entry surface
plane touching the outermost parts of the capture device regardless of the shape

Note 1 to entry: A schematic expression of entry surface independent on the shape is given in Figure 1 and 3.

3.6
aspect ratio
ratio of the lengths x and y in the entry surface, with x > y
1 1

Note 1 to entry: Schematic layout of an ellipse capture device see Figure 2. The aspect ratio is 1 for a circular

device and greater than 1 for other shapes.
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Key

x , y , z centre point of the entry surface and origin for the measurement point co-ordinates

0 0 0

x1 length of the entry surface of the capture device in the x-direction (x1 > y1)

y length of the entry surface of the capture device in the y-direction (x > y )
1 1 1
Figure 2 — Schematic layout of an ellipse capture device
3.7
measurement plane

two-dimensional area in front of the capture device and parallel to the entry surface)

Note 1 to entry: Distance from the measuring position to the entry surface (Lmp) is specified in the air velocity

measurement procedure. A schematic layout showing position of the measurement plane in relation to the entry

surface is included in Figure 3.
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Key
1 Capture device
2 Duct of capture device
3 Entry surface
4 Measurement plane
5 Center line
D Internal diameter of the duct of the capture device

Lmp Measurement plane distance from the capture device entry surface specified in the air velocity

measurement procedure

Figure 3 — Schematic layout showing position of the measurement plane in relation to the entry

surface
3.8
reachable workspace

three-dimensional workspace in which the specified capture zone is achievable with movement of an

articulated extraction arm

Note 1 to entry: The capture zone extract volume flow can vary with changes in the articulated extraction arm

configuration.
3.9
working zone

space where the activity or process generates the contaminant cloud that should be removed by the

capture device
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4 Test room and general test conditions
4.1 Dimension and construction of the test room

The test room shall consist of an enclosure of cuboid shape, constructed of suitable materials, within an

existing building or laboratory. The internal width and length shall be not less than 4,0 m and the ceiling

height not less than 2,7 m. The ceiling and floor shall be level and the room shall be devoid of internal

supports, internal walls or other obstacles to the airflow.

The test zone boundary shall extend approx. 1,5 m from the capture device opening in all directions and

over the full room height.
4.2 Test room conditions

The room air temperature shall be (23 ± 3) °C. The make-up air temperature during measurements shall

be room air temperature ± 1 °C. Temperature gradients shall be avoided to the greatest possible extent.

The make-up air shall be supplied at a distance greater than 2 m from the front of the capture device.

Room extract air shall be extracted symmetrically on the opposite side to the make-up air supply and

from outside the test zone. The air speed shall be less than 0,05 m/s at the test zone boundaries. Care

shall be taken regarding uncontrolled air streams and draughts entering the test room.

Any device the temperature of which exceeds 40 °C, shall be located outside the test zone boundaries.

The air extracted from the test room shall be discharged to atmosphere in such a way as to prevent its re-

entrainment in the make-up air.
4.3 Articulated extract arm installation
The articulated extract arm shall be installed centrally in the test room.

The test shall be carried out on articulated extract arm installed in the test room in accordance with the

manufacturer's installation instructions.
4.4 Test conditions
4.4.1 General

No person other than the operator(s) shall be present in the test room during the measurements. No

person shall remain in the test zone during the measurements. There shall be no unnecessary

obstructions or equipment within the test zone.
Windows and doors of the test room shall remain closed during measurements.
4.4.2 Setting extract air volume flow rate

Tests shall be performed with extract air volume flow rates in the capture device duct corresponding to

set air velocities of 5 m/s, 9 m/s, 12 m/s and 15 m/s and higher at position b in Figure 1. Air velocity of

15 m/s and higher can be excluded if specified by the manufacturer. The flow rate shall be measured in

the extract duct in accordance with EN ISO 5167-1:2003. The uncertainty of measurement shall not

exceed ± 5 %.
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5 Type test methods
5.1 General

Every combination of extraction arm and capture device is considered as unique type of articulated

extraction arm. The type tests are for a specific combination of extraction arm and capture device. Other

combinations shall be tested separately.
5.2 Capture zone measurement
5.2.1 General

The articulated extract arm shall be tested by measuring the air velocity field created in front of the entry

surface at defined distances from the capture device opening.
5.2.2 Test Equipment

Low velocity anemometer, omnidirectional, suitable for measuring air velocities in the range 0,05 m/s to

3 m/s with an accuracy of 0,02 m/s ± 5 % of the reading or better, with a response time less than or equal

to 1 s and having a calibration that is traceable to national standards.

Flow measuring device, or other suitable device, capable of measuring air flow rates in accordance with

EN ISO 5167-1 with a maximum uncertainty of ± 5 % and having a calibration that is traceable to national

standards.
Measure, suitable for measuring distances with an uncertainty of ± 1 mm.
5.2.3 Test Principle

Tests are performed to determine the three-dimensional zones where the air has a velocity of > 0,2 m/s

and > 0,4 m/s in front of the capture device. (With a capture velocity of 0,2 m/s the capture efficiency can

be expected to be higher than 97 % with isothermal conditions and disturbing air currents < 0,2 m/s at

recommended sidewise use, see Annex A, Figure A.3 and A.4)

Measurements are made in measurement planes parallel to the entry surface of the capture device (see

Figure 3). For each measurement plane the distance from the centre line of the capture device to the point

where the air velocity is 0,2 m/s and 0,4 m/s is decided in both the x- and y-direction.

The results are described as a table with distances from the centre line in x- and y-direction verses L

(see Figure 3) for each measurement plane. The capture zone is determined with main air flow rates

corresponding to the air velocity of 4.4.2 in the duct of the capture device (see key b in Figure 1).

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Dimensions in millimetres
Key
0,2 m/s
0,4 m/s
Figure 4 — Schematic layout showing Capture velocity test measuring points
5.2.4 Test procedure
Set up the articulated extract arm under the conditions specified in Clause 4.

Measurement planes parallel to the entry surface of the capture device are considered. The first

measurement plane will be at 20 mm distance (L in Figure 3) from the capture device entry plane.

There will be another measurement plane repeated for each 20-mm distance from the entry surface (see

Figure 4) until < 0,2 m/s and < 0,4 m/s are measured in the centre line of the capture device. For

articulated extract arms with a duct diameter ≥ 100 mm some of the measuring points can be excluded if

noted in the test report.

Adjust the air flow rate through the capture device to the test flow according to 4.4.2.

Measure the volume air flow rate at the beginning and at the end of the test using the flow meter (5.2.2.).

In each measurement plane move the anemometer probe in x- and y-directions to the predefined capture

velocity value of 0,2 m/s and 0,4 m/s (see Figure 4). Measure and record the air velocity at that point

over a period of 1 min using the low velocity anemometer (5.2.2) and measure the distance from the

= y , aspect ratio = 1) measurements only need to
centre line. For circular symmetric capture devices (x1 1

be made in either the x- or y-direction. For other symmetric shaped capture devices (x > y )

1 1

measurements need to be made in both the x- and y-direction. For other shapes of capture devices

measurements need to be made in four directions from the centre line.

Repeat the procedures with the air flow rate adjusted to the other test flows according to 4.4.2.

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5.3 Capture efficiency and robustness test
5.3.1 Test equipment
5.3.1.1 Moving plate

A flat rectangular plate with height of (1,90 ± 0,01) m, width of (0,40 ± 0,01) m and thickness of

(20 ± 5) mm with rounded edges (radius 10 mm) shall be mounted in front of the longest side of the test

table with the articulated extract arm. The plate shall be mounted vertically and 90 degrees to the table

front. The plate shall be movable during the capture efficiency test with a speed of (1,0 ± 0,1) m/s across

the front of the table.
5.3.1.2 Gas analyser

The gas analyser including the connected means of recording shall have a detection level of 10 or less

volume fraction of the tracer gas.
5.3.1.3 Flow meter

Flow meter, or other suitable device, capable of measuring air flow rates with a maximum uncertainty

of ± 5 % and having a calibration that is traceable to national standards.
5.3.1.4 Test table

A table with the minimum dimensions of 1 500 mm × 1000 mm and with a height of minimum 750 mm

above the floor level, placed with the centre of the table in the centre of the test room, shall be used for

the capture efficiency tests.
5.3.2 Test principle

The articulated extract arm shall be tested by measuring the capture efficiency at three examples of use.

The capture efficiency η of the articulated extract arm is measured with and without disturbance in

accordance with EN 1093-4.

The principle of the test method consists of emitting a tracer gas, to simulate a low energy release at a

flow rate (q ) and measuring the tracer gas flowrate in the airflow collected by the articulated extract arm

(q ). During the test a disturbance will be induced to challenge the robustness of the capture efficiency at

the test extract air flow rate.
The capture efficiency without disturbance η , as a percentage, will be:
(1)
η × 100

The capture efficiency can also be expressed in terms of tracer gas concentrations as:

CC−
3 1
(2)
η × 100
C − C
2 1
where
C is the mean background concentration of the tracer gas before the test.
C is the mean duct concentration of the tracer gas when emitted in the duct.

C is the mean duct concentration of the tracer gas when emitted at the test position.

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The capture efficiency during disturbance can be expressed in terms of tracer gas concentration as:

CC−
(3)
η ×100
C − C
2 1
where
C is the mean background concentration of the tracer gas after the test.

C is the mean duct concentration of the tracer gas when emitted at the test position during disturbance.

5.3.3 Test method

The tracer gas shall be induced through a sphere with a diameter of 40 mm. The sphere shall be

perforated with 14 nozzles. The diameter of each nozzle shall be 1,0 mm.

Test shall be performed with the tracer gas induced through the sphere 50 mm above the test table. The

sphere shall be placed in the middle of the table and the air volume flow rate through the local exhaust

device is to be adjusted to the test flow according to 4.4.2.

The capture device of the articulated extract arm shall be placed with the entry surface X mm from the

sphere. There are three test cases A, B and C.

In test case A the capture device of the articulated extract arm is placed on the table with the outermost

parts of the capture device touching the surface of the table. The centre line of the capture device is

perpendicular to the longest side of the table and parallel to the surface of the table.

In test case B the articulated extract arm is placed in the air with the centre line of the capture device at

a 45-degree angle towards the surface of the table and perpendicular to the longest side of the test table.

In test case C the articulated extract arm is placed in the air with the centre line of the capture device

perpendicular to the surface of the table.

The tracer gas shall be induced, and the capture efficiency measured according to EN 1093-4 for X = D,

2 × D, 3 × D, 4 × D and 5 × D (where X = the distance in Figure 5, 6, and 7, and D = the diameter of the duct

of the capture device, see Figure 3)). Additional distances (X) can be tested on request from the

manufacturer. During the test, the movable plate is started and passes the Table 6 times with 30 s

intervals. The traverse of the plate shall extend for min. 600 mm on each side beyond the edge of the

table.
The test shall be repeated for other test flows according to 4.4.2.
5.3.4 Test procedure

Set up the articulated extraction arm and test under the test conditions specified in Clause 4 and 5.3.3.

The movable plate shall be mounted with the lowest edge 200 mm ± 5 mm above the floor and with the

edge closest to the Table (400 ± 5) mm from the table.

Connect the articulated extraction arm to the extract system. Switch on the extract air system and adjust

the con
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