SIST EN 14624:2020

Performance of portable locating leak detectors and of fixed gas detectors for all refrigerants

This document specifies the requirements for portable locating leak detectors and fixed gas detectors for all refrigerants.
Locating detectors used in factories for manufacturing processes are not included in the Scope of prEN 14624.
1.1   Product application:
This document applies to different applications and environments such as plant and machine rooms, production rooms, cold rooms, supermarkets, occupied spaces like offices and hotels.
1.2   Product performance:
This document specifies minimum requirements for sensitivity, operating range, response time, environmental conditions and cross sensitivity from interference gases.
1.3   Product installation:
This document gives guidance of suitable technology, location of detection points, interconnection with secondary equipment (e.g. initiation of mechanical ventilation, personnel warning, equipment shutdown).
1.4   Service and maintenance:
This document gives guidance for service and maintenance: Sensors and mechanical equipment have a limited operating life and require regular performance verification to ensure conformity.

Leistung von mobilen Leckdetektoren und Raumüberwachungsgeräten für halogenierte Kältemittel

Dieses Dokument legt die Anforderungen für mobile Leckdetektoren mit Suchfunktion und feste Gasmelder für alle Kältemittel fest.
Leckdetektoren mit Suchfunktion, die für Fertigungsprozesse in Fabriken verwendet werden, liegen nicht im Anwendungsbereich von prEN 14624.
1.1   Anwendung des Produkts:
Dieses Dokument gilt für unterschiedliche Anwendungen und Umgebungen wie Anlagen- und Maschinen-räume, Fertigungsräume, Kältekammern, Supermärkte und Räume, in denen sich Personen aufhalten, wie z. B. Büros und Hotels.
1.2   Leistung des Produkts:
Dieses Dokument legt Mindestanforderungen für Empfindlichkeit, Betriebsbereich, Ansprechzeit, Umgebungsbedingungen und Querempfindlichkeit durch Störgase fest.
1.3   Montage des Produkts:
Dieses Dokument bietet einen Leitfaden für geeignete Technologien, den Standort von Erkennungspunkten, die Anbindung an Zusatzausrüstung (z. B. Aktivierung von mechanischer Lüftung, Personalwarnung, Anlagen Abschaltung).
1.4   Wartung und Instandhaltung:
Dieses Dokument bietet einen Leitfaden für die Wartung und Instandhaltung: Sensoren und mechanische Geräte haben eine beschränkte Betriebslebensdauer und müssen zur Sicherstellung ihrer Konformität regel¬mäßig auf ihre korrekte Funktion geprüft werden.

Performances des détecteurs de fuite portables et des contrôleurs d'ambiance de fluides frigorigènes halogénés

Le présent document spécifie les exigences relatives aux détecteurs de fuites portables et aux détecteurs de gaz fixes pour tous les fluides frigorigènes.
Les détecteurs utilisés dans les usines pour les  procédés de fabrication ne sont pas inclus dans le domaine d'application du prEN 14624.
1.1   Application du produit :
Le présent document s'applique à différentes applications et environnements tels que les usines et salles de machines, les salles de production, les chambres froides, les supermarchés, les espaces occupés comme les bureaux et les hôtels.
1.2   Performance du produit :
Le présent document spécifie les exigences minimales en matière de sensibilité, de plage de fonctionnement, de temps de réponse, de conditions environnementales et de sensibilité aux interférences de gaz.
1.3   Installation du produit :
Le présent document fournit des orientations sur la technologie appropriée, l'emplacement des points de détection, l'interconnexion avec l'équipement secondaire (par exemple, déclenchement de la ventilation mécanique, avertissement du personnel, arrêt de l'équipement).
1.4   Entretien et maintenance :
Le présent document donne des conseils pour l'entretien et la maintenance : les capteurs et l'équipement mécanique ont une durée de vie limitée et une vérification régulière des performances est nécessaire pour assurer la conformité.

Lastnosti premično lociranih javljalnikov puščanja in fiksnih detektorjev plina za vsa hladilna sredstva

General Information

• Status: Published
• Public Enquiry End Date: 31-Oct-2018
• Publication Date: 07-Apr-2020
• ICS: 13.320 - Alarm and warning systems
• ICS: 27.200 - Refrigerating technology
• ICS: 71.100.45 - Refrigerants and antifreezes
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-Mar-2020
• Due Date: 04-Jun-2020
• Completion Date: 08-Apr-2020
• Ref Project: EN 14624:2020 - Performance of portable locating leak detectors and of fixed gas detectors for all refrigerants

RELATIONS

• Revised: SIST EN 14624:2012 - Performance of portable leak detectors and of room monitors for halogenated refrigerants
• Effective Date: 01-Oct-2014
• Replaces: SIST EN 14624:2012 - Performance of portable leak detectors and of room monitors for halogenated refrigerants
• Effective Date: 24-Mar-2020

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 14624:2020
01-junij-2020
Nadomešča:
SIST EN 14624:2012

Lastnosti premično lociranih javljalnikov puščanja in fiksnih detektorjev plina za

vsa hladilna sredstva

Performance of portable locating leak detectors and of fixed gas detectors for all

refrigerants
Leistung von mobilen Leckdetektoren und Raumüberwachungsgeräten für halogenierte
Kältemittel

Performances des détecteurs de fuite portables et des contrôleurs d'ambiance de fluides

frigorigènes halogénés
Ta slovenski standard je istoveten z: EN 14624:2020
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
27.200 Hladilna tehnologija Refrigerating technology
71.100.45 Hladiva in antifrizi Refrigerants and antifreezes
SIST EN 14624:2020 en,fr,de

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

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SIST EN 14624:2020
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SIST EN 14624:2020
EN 14624
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 23.040.99; 71.100.45 Supersedes EN 14624:2012
English Version
Performance of portable locating leak detectors and of
fixed gas detectors for all refrigerants

Performances des détecteurs de fuites portables et des Leistung von mobilen Leckdetektoren und stationären

détecteurs de gaz fixes pour tous les fluides Gasmeldern für alle Kältemittel
frigorigènes
This European Standard was approved by CEN on 3 February 2020.

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 NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14624:2020 E

worldwide for CEN national Members.
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SIST EN 14624:2020
EN 14624:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

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

3 Terms and definitions ................................................................................................................................... 7

4 Symbols and abbreviations ....................................................................................................................... 10

5 General requirements for all portable locating leak detectors and fixed gas

detectors — Refrigerant gas type (informative) ............................................................................... 10

6 Specific requirements for portable locating leak detectors .......................................................... 11

6.1 Detection limits ............................................................................................................................................. 11

6.1.1 General.............................................................................................................................................................. 11

6.1.2 Static detection limit - the leak detector probe is stationary ....................................................... 11

6.1.3 Dynamic detection limit - the leak detector probe is moving ....................................................... 11

6.1.4 Dynamic detection limit in a contaminated environment ............................................................. 11

6.2 Response time ................................................................................................................................................ 11

6.3 Recovery time ................................................................................................................................................ 11

6.4 Calibration frequency and procedure ................................................................................................... 11

7 Test apparatus for portable leak detectors ......................................................................................... 11

7.1 General.............................................................................................................................................................. 11

7.2 Calibration leaks ........................................................................................................................................... 12

7.3 Measuring distance ...................................................................................................................................... 12

7.4 Apparatus no. 1: detector probe stationary at the orifice of calibration leak ........................ 12

7.5 Apparatus no. 2: detector probe moved with defined speed and distance in front of a

calibration leak .............................................................................................................................................. 12

7.6 Apparatus no. 3a: Chamber with monitored concentration ......................................................... 14

8 Performance tests of portable leak detectors .................................................................................... 15

8.1 General.............................................................................................................................................................. 15

8.2 Test no. 1: Static detection limits ............................................................................................................ 15

8.3 Test no. 2: Dynamic detection limits ...................................................................................................... 15

8.4 Test no. 3 Dynamic detection limit in a contaminated environment ......................................... 16

8.5 Test no. 4: Response time .......................................................................................................................... 16

8.6 Test no. 5: Recovery time ........................................................................................................................... 16

9 Portable leak detector characteristics, reporting of test results and requirements ........... 17

9.1 Reporting of test result ............................................................................................................................... 17

9.2 Minimum product requirements ............................................................................................................ 17

10 Service and maintenance — Portable locating leak detectors — Periodic check and

calibration ....................................................................................................................................................... 18

11 Technical specification and product information — Portable locating leak detectors ...... 18

12 Specific requirements for fixed gas detectors .................................................................................... 18

12.1 General.............................................................................................................................................................. 18

12.2 Suitability ......................................................................................................................................................... 19

12.3 Function of gas detector ............................................................................................................................. 19

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SIST EN 14624:2020
EN 14624:2020 (E)

12.4 Ambient conditions, temperature and humidity .............................................................................. 19

12.5 Typical measuring ranges and thresholds .......................................................................................... 20

12.6 Accuracy and performance ....................................................................................................................... 21

12.7 Response time ................................................................................................................................................ 21

13 Test apparatus for fixed gas detectors .................................................................................................. 22

13.1 General ............................................................................................................................................................. 22

13.2 Apparatus no. 3b: Chamber with monitored concentration ......................................................... 22

13.3 Apparatus no. 4: Calibration gas with specific concentration ...................................................... 23

13.4 Apparatus no. 5: Calibration gas for aspirated systems ................................................................. 24

14 Performance tests of gas detector .......................................................................................................... 24

14.1 General ............................................................................................................................................................. 24

14.2 Test conditions — Temperature and humidity ................................................................................. 24

14.3 Test methods .................................................................................................................................................. 25

14.3.1 General ............................................................................................................................................................. 25

14.3.2 Test of accuracy and thresholds .............................................................................................................. 25

14.3.3 Test of response time .................................................................................................................................. 25

15 Fixed gas detector characteristics, reporting of test results — Reporting of test

results ............................................................................................................................................................... 25

16 Service and maintenance — Fixed gas detectors .............................................................................. 25

16.1 Expected sensor lifecycle ........................................................................................................................... 25

16.2 Periodic check and calibration ................................................................................................................ 25

17 Technical specification and product information - Fixed gas detectors .................................. 26

Annex A (informative) Conversion factors of leakage rate units ............................................................... 27

Annex B (informative) Correlation between test gas concentration and leakage rate ...................... 28

B.1 EXAMPLE 1a: Conversion of a concentration increase in a hood to a total leakage

volume flow rate (pV-throughput) ......................................................................................................... 28

B.2 EXAMPLE 1b: Concentration increase due to a small leak in a voluminous room ................ 28

B.3 EXAMPLE 2: Conversion of a leakage rate (pV-throughput) into a mass flow rate............... 29

B.4 EXAMPLE 3:Calculation of the concentrations of tracer gas to be detected in front of

a leak with specified leakage rate .......................................................................................................... 30

Annex C (informative) Guidelines for application of Fixed Gas Detectors .............................................. 32

Annex D (informative) Calculation of gas concentration from kg/m3 to ppm ...................................... 33

Annex E (informative) Selectivity, cross interference and potential contaminants ........................... 34

Bibliography ................................................................................................................................................................. 36

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SIST EN 14624:2020
EN 14624:2020 (E)
European foreword

This document (EN 14624:2020) has been prepared by Technical Committee CEN/TC 182

“Refrigerating systems, safety and environmental requirements”, 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 September 2020, and conflicting national standards

shall be withdrawn at the latest by September 2020.

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 14624:2012.
The following changes have been made during revision:

a) the document has been restructured and divided into two parts: Portable locating leak detectors

and fixed gas detectors;
b) the document covers all types of refrigerants;

c) Annex C “Guidelines for application of Fixed Gas Detectors” has been modified;

d) Annex D “Calculation of gas concentration from kg/m to ppm” has been added;

e) Annex E “Selectivity, cross interference and potential contaminants” has been added.

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.
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SIST EN 14624:2020
EN 14624:2020 (E)
Introduction

This document recognizes the unique nature of leak detection and gas detection for refrigerating

systems, air condition systems and heat pumps and is intended to address the specific needs of the

refrigeration and heat pump industry. This document should be read in conjunction with the

EN 378 series.
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SIST EN 14624:2020
EN 14624:2020 (E)
1 Scope
1.1 General

This document specifies the requirements for portable locating leak detectors and fixed gas detectors

for all refrigerants.

Locating detectors used in factories for manufacturing processes are not included in the Scope of

EN 14624.
1.2 Product application

This document applies to different applications and environments such as plant and machine rooms,

production rooms, cold rooms, supermarkets, occupied spaces like offices and hotels.

1.3 Product performance

This document specifies minimum requirements for sensitivity, operating range, response time,

environmental conditions and cross sensitivity from interference gases.
1.4 Product installation

This document gives guidance of suitable technology, location of detection points, interconnection with

secondary equipment (e.g. initiation of mechanical ventilation, personnel warning, and equipment

shutdown).
1.5 Service and maintenance

This document gives guidance for service and maintenance: Sensors and mechanical equipment have a

limited operating life and require regular performance verification to ensure conformity.

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 378-1:2016, Refrigerating systems and heat pumps — Safety and environmental requirements —

Part 1: Basic requirements, definitions, classification and selection criteria

EN 378-2:2016, Refrigerating systems and heat pumps — Safety and environmental requirements —

Part 2: Design, construction, testing, marking and documentation

EN 378-3:2016, Refrigerating systems and heat pumps — Safety and environmental requirements —

Part 3: Installation site and personal protection

EN 378-4:2016+A1:2019, Refrigerating systems and heat pumps — Safety and environmental

requirements — Part 4: Operation, maintenance, repair and recovery

EN 45544-1:2015, Workplace atmospheres — Electrical apparatus used for the direct detection and

direct concentration measurement of toxic gases and vapours — Part 1: General requirements and test

methods

EN 45544-3, Workplace atmospheres — Electrical apparatus used for the direct detection and direct

concentration measurement of toxic gases and vapours — Part 3: Performance requirements for

apparatus used for general gas detection
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SIST EN 14624:2020
EN 14624:2020 (E)

EN 60079-29-1, Explosive atmospheres — Part 29-1: Gas detectors — Performance requirements of

detectors for flammable gases (IEC 60079-29-1)
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/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
refrigerant

fluid used for heat transfer in a refrigerating system, which absorbs heat at a low temperature and a low

pressure and rejects heat at a higher temperature and a higher pressure usually involving changes of

the state of the fluid
3.2
gas concentration

ratio in weight or in volume of a given gas to the total weight or volume of the gas mixture

Note 1 to entry: The concentration is dimensionless and is designated either with ppm (m/m) = parts per

million (mass) or ppm (V/V) = parts per million (volume).
3.3
leakage rate
gas flow through a fissure, an orifice or aperture

Note 1 to entry: The usual leakage rate unit is gram per year (g/a). For other measuring units see Annexes A and

B (informative).
3.4
fixed gas detector

electrical device which permits the indication or the measurement of concentrations of refrigerant

gases in the atmosphere at one or several points
3.5
indicating fixed gas detector

electrical device indicating that one or several levels of pre-set concentration thresholds have been

exceeded, but with no indication of the measured value
3.6
measuring fixed gas detector

electrical device that measures concentration and displays the respective value and/or gives a

proportional output

Note 1 to entry: The device may also indicate when pre-set concentration thresholds have been exceeded.

Note 2 to entry: Measuring detectors can be aspirated devices with one or more channels which sequentially

sample air for the target gas
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SIST EN 14624:2020
EN 14624:2020 (E)
3.7
portable locating leak detector

electrical device, either indicating or measuring leak detector with a detector probe capable of

localizing a leak by measuring a local gas concentration with short response time

Note 1 to entry: This type of detectors is used for service and maintenance to search for leaks on refrigeration

systems.
3.8
portable indicating leak detector

electrical device indicating one or several levels of concentration or leakage rate thresholds, but with no

indication of the measured value
3.9
portable measuring leak detector

electrical device that measures leakage rates or concentrations and displays the respective value or

gives a proportional output signal
3.10
detector probe

flexible tube connected to portable locating leak detector that either has a sensor attached at the end of

it or is used to carry a sample to the sensor in the body or the portable locating leak detector

3.11
calibration gas

gas consisting of the target gas in a suitable carrier gas and at a specified concentration and accuracy

traceable to national standards, e. g. R404A at 1 000 ppm in air
Note 1 to entry: Refer to product manufacturer regarding suitable carrier gas.

Note 2 to entry: Calibration gases are readily available in cylinders or may be produced in test chambers by

injection of the target gas by syringe or using calibrated mass flow controllers or equivalent.

3.12
calibration leak

device with a defined flow rate of a given gas under defined pressure and temperature conditions used

to calibrate/test a portable leak detector

Note 1 to entry: Calibration leaks are themselves calibrated according to operation conditions (upstream and

downstream pressure) against a primary or secondary standard that is traceable to national standards (standard

leak).
3.13
response time for an indicating detector

time elapsing from the moment the detector in normal operation is exposed to a defined gas

concentration or a leak rate above pre-set threshold until an indication occurs
3.14
response time for a measuring detector

time elapsing from the moment the detector in normal operation is exposed to a defined gas

concentration or a leak rate until it reaches pre-defined percentage of its final reading, e. g. 90 % is

referred to as t90
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SIST EN 14624:2020
EN 14624:2020 (E)
3.15
recovery time for portable locating leak detectors

time required for a locating leak detector to indicate the lower detection limit again after exposure to a

specified large leakage rate without any manual zeroing operation
3.16
zeroing time for portable locating leak detectors

time from immersion of the probe into a fixed concentration of gas until indicated zero is stable

(automatically or after a zeroing action specified by the manufacturer)
3.17
lower detection limit for portable locating leak detectors

minimum detectable leakage rate which can be indicated with specified uncertainty and/or for which

an indication threshold can be set and is repeatedly triggered
3.18
upper detection limit for portable locating leak detectors

maximum detectable leakage rate which can be indicated with specified uncertainty and/or for which

an indication threshold can be set and is repeatedly triggered
3.19
indication thresholds

one or more pre-set values which can be set and repeatedly triggered by the appropriate gas

concentration or leakage rate
3.20
selectivity
ability to identify a specific gas or group of gases among other gases

Note 1 to entry: Portable locating leak detectors and fixed gas detectors can be selective or non-selective.

Note 2 to entry: Non-selective detectors cannot identify a specific gas among other gases but the gases they can

detect and that are present in the mixture will output a common value.
3.21
measuring range

range of measured values of gas concentration over which the accuracy of the apparatus lies within

specified limits
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SIST EN 14624:2020
EN 14624:2020 (E)
4 Symbols and abbreviations

For the purposes of this document, the symbols and abbreviations given in Table 1 apply.

Table 1 — Symbols and abbreviations
Symbol Description Unit
V accumulation volume m
acc
Vmol molar volume m /mol
M molar mass g/mol
ṁ mass flow kg/s or g/a
v̇ molar mass flow rate mol/s
q Leakage rate (pV-throughput) mbar l/s or Pa m /s
C Concentration (volume) V/V
V/V
C Concentration (mass) m/m
m/m
C Concentration in parts per million (V/V) ppm
ppm
C Concentration in percent of lower flammable limit %LFL
LFL
Gas flow Gas flow in litres per minute l/min
5 General requirements for all portable locating leak detectors and fixed gas
detectors — Refrigerant gas type (informative)

Refrigerants are defined in different groups as stated in Table 2 — Refrigerant types.

Table 2 — Refrigerant types
Non-toxic Toxic
Higher flammability A3 B3
Flammable A2 B2
Lower flammability A2L B2L
No flame propagation A1 B1
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SIST EN 14624:2020
EN 14624:2020 (E)
6 Specific requirements for portable locating leak detectors
6.1 Detection limits
6.1.1 General

Portable leak detectors shall be able to indicate a leak in the following situations: first, when the

detector probe is stationary in front of a leak, and second, when the detector probe is moving in front of

a leak.
6.1.2 Static detection limit - the leak detector probe is stationary

The portable leak detector with the probe held stationary in front of a leak of a specified minimum size

at a measuring distance of 3 mm (d in Figure 1 — Measuring distance b) shall give a visual or acoustical

alarm indicating that an alarm threshold has been met.
6.1.3 Dynamic detection limit - the leak detector probe is moving

The detector probe, when moved across a leak of a specified size passing at a speed of 2 cm/s and a

distance of 3 mm (d in Figure 1 —Measuring distance b) in front of the leak, shall give a visual or

acoustical alarm indicating that an alarm threshold has been met.
6.1.4 Dynamic detection limit in a contaminated environment

The portable leak detector shall be able to compensate for a background concentration of refrigerant

and retain its detection ability for leak location.
6.2 Response time
The manufacturer shall specify the response time of the device.
6.3 Recovery time
The manufacturer shall specify the recovery time of the device.
6.4 Calibration frequency and procedure

The manufacturer shall specify the recommended frequency and procedure for calibrating the device.

Local regulations or standards may supersede the manufacturer’s recommendation.
7 Test apparatus for portable leak detectors
7.1 General

A portable leak detector may be tested with any specific refrigerant to claim compliance for that single

gas or it may be tested with the following representative gases to claim compliance to the respective

type of refrigerants.
Table 3 — Representative gases
Type Representative gas
HFO R-1234yf
HFC/HCFC R134a
Hydrocarbon R-290
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SIST EN 14624:2020
EN 14624:2020 (E)

Other refrigerants, for example CO (R744) and Ammonia (R717) shall be tested individually for

compliance.
7.2 Calibration leaks

Two types of calibration leaks exist and are commercially available: capillary calibration leaks and

membrane calibration leaks (permeation membrane). Membrane or capillary calibration leaks shall be

re-calibrated after a time recommended by the manufacturer. The calibration shall be traceable to

national standards.

The uncertainty of the nominal leakage rate of calibration standards used for the qualification of

portable leak detectors according to this document shall be no more than ± 20 %.
7.3 Measuring distance
Figure 1 — Measuring distance — describes the measuring distance (d).
Key Key
1 leak detector probe 1 leak detector probe
2 test object with leak 3 calibration leak outlet
d measuring distance d measuring distance

a) Measuring distance d during leak search b) Measuring distance d during calibration with

on a test object a calibration leak
Figure 1 —Measuring distance

7.4 Apparatus no. 1: detector probe stationary at the orifice of calibration leak

The apparatus comprises a calibration leak and a fixture for positioning the probe of the portable leak

detector such that it can be quickly (less than 2 s) moved from a location at least 10 cm away from the

calibration leak to a position where the probe tip is held stationary at a distance of 3 mm ± 0,5 mm

directly in front of the calibration leak orifice or membrane.

The apparatus is located in a room where ambient temperature is (20 to 25) °C and relative humidity

(30 to 70) % at atmospheric pressure.

7.5 Apparatus no. 2: detector probe moved with defined speed and distance in front of a

calibration leak
The apparatus co
...