ISO 26142:2010

INTERNATIONAL ISO
STANDARD 26142
First edition
2010-06-01
Hydrogen detection apparatus —
Stationary applications
Détecteurs d'hydrogène — Applications fixes

Reference number
©
ISO 2010
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ii © ISO 2010 – All rights reserved

Contents Page
Foreword .v
Introduction.vi
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 General requirements .4
4.1 Construction .4
4.1.1 General .4
4.1.2 Enclosure .4
4.1.3 Measuring range.4
4.1.4 Alarm system .4
4.1.5 Indicators.5
4.1.6 Adjustments.5
4.1.7 Software-controlled hydrogen detection apparatus.6
4.1.8 Reliability.7
4.2 Labelling and marking .8
4.3 Instruction manual .8
4.4 Vibration .9
5 Performance requirements.9
6 Tests .9
6.1 General requirements for tests .9
6.1.1 Number of samples .9
6.1.2 Sequence of tests.9
6.1.3 Preparation of the hydrogen detection apparatus before testing.10
6.2 Test equipment .10
6.3 Normal test conditions.10
6.3.1 Temperature.10
6.3.2 Pressure .10
6.3.3 Humidity .10
6.3.4 Voltage.10
6.3.5 Orientation .10
6.4 Test methods .11
6.4.1 General .11
6.4.2 Standard response test.11
6.4.3 Measuring range and calibration .11
6.4.4 Stability.12
6.4.5 Alarm set point(s) .13
6.4.6 Temperature.13
6.4.7 Pressure .14
6.4.8 Humidity .14
6.4.9 Vibration .14
6.4.10 Orientation .15
6.4.11 Flow rate for aspirated apparatus.16
6.4.12 Air velocity .16
6.4.13 Time of response and time of recovery .17
6.4.14 Selectivity.17
6.4.15 Poisoning .17
6.4.16 Operation above the measuring range.18
6.4.17 Power supply variations .18
6.4.18 Power supply interruptions, voltage transients and step changes of voltage .19
6.4.19 Warm-up time after restart.19
6.4.20 Electromagnetic immunity.19
6.4.21 Field calibration kit .20
Annex A (informative) Chamber test method .21
Annex B (informative) Flow-through test method.24
Bibliography .27

iv © ISO 2010 – All rights reserved

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 26142 was prepared by Technical Committee ISO/TC 197, Hydrogen technologies.

Introduction
Over the course of several years, international efforts have been initiated for the development of necessary
regulations, codes and standards required for the introduction of hydrogen energy systems in consumer
environments. Such codes and standards usually require a safety system to detect hydrogen concentrations
before a fraction of the flammable or explosive limit is reached, in order to allow for purging, shut-off, and
similar safety operations.
This International Standard provides requirements for stationary hydrogen detection apparatus, covering both
performance requirements and test methods. This International Standard is intended to cover situations where
the user desires the ability to detect hydrogen leaks and monitor hydrogen concentrations relevant to safety.
This International Standard is primarily intended for hydrogen detection apparatus at vehicle refuelling stations,
where a high level of safety management is required. This sector has an immediate need for this standard and
is expected to be the main application for such apparatus, but this standard can also be applied to other
stationary installations where the detection of hydrogen is required.
This International Standard is not intended to exclude any specific technologies that meet the performance
requirements herein.
This International Standard contains the important quantitative and technical specifications against the danger
of hydrogen leakage. This standard will promote international cooperation under easy-to-understand
requirements, by leading to widespread use of hydrogen energy.
Benefits to be gained by the implementation of this International Standard include using the performance
requirements in the standard to overcome safety concerns and aiding in development of the hydrogen fuel
infrastructure.
In this International Standard, attention is concentrated on specific requirements related to performance and
testing of hydrogen detection apparatus, such as a specific detection range for single and multiple safety
systems, selectivity, poisoning, fast response time, and hydrogen-specific test methods needed by the
hydrogen energy industry. This International Standard focuses primarily on stationary hydrogen technologies
whose main purpose is to produce, store and handle hydrogen, and not on systems that might generate
hydrogen as an undesirable by-product. The purpose of a hydrogen detection apparatus according to this
standard is to mitigate risk from unintended hydrogen releases within a wide range of hydrogen
concentrations including those exceeding the lower flammability limit.
Hydrogen-related facilities might be required to have the ability to detect hydrogen concentrations before a
specified co
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