Amendment 1 - Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for flammable gases

Amendement 1 - Atmosphères explosives - Partie 29-1: Détecteurs de gaz - Exigences d'aptitude à la fonction des détecteurs de gaz inflammables

General Information

Status
Published
Publication Date
23-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
24-Mar-2020
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IEC 60079-29-1:2016/AMD1:2020 - Amendment 1 - Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for flammable gases
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IEC 60079-29-1
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Explosive atmospheres –
Part 29-1: Gas detectors – Performance requirements of detectors for flammable
gases
Atmosphères explosives –
Partie 29-1: Détecteurs de gaz – Exigences d’aptitude à la fonction des
détecteurs de gaz inflammables
IEC 60079-29-1:2016-07/AMD1:2020-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60079-29-1
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Explosive atmospheres –
Part 29-1: Gas detectors – Performance requirements of detectors for flammable
gases
Atmosphères explosives –
Partie 29-1: Détecteurs de gaz – Exigences d’aptitude à la fonction des
détecteurs de gaz inflammables
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-7966-3

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60079-29-1:2016/AMD1:2020
 IEC 2020
FOREWORD

This amendment has been prepared by IEC technical committee 31 Equipment for explosive

atmospheres
The text of this amendment is based on the following documents:
FDIS Report on voting
31/1525/FDIS 31/1533/RVD

Full information on the voting for the approval of this amendment can be found in the report on

voting indicated in the above table.

The committee has decided that the contents of this amendment and the base publication will

remain unchanged until the stability date indicated on the IEC website under

"http://webstore.iec.ch" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

_____________
5.2.2.1 General
Replace the existing text of 5.2.2.1 with the following new text:

For the purposes of type testing, all applicable tests shall be carried out on the same sample

except a separate sample may be used for the tests of 5.4.4.3 to 5.4.4.6, and 5.4.16, a separate

sample may be used for the test of 5.4.20, and a separate sample may be used for the test of

5.4.21.

If a test sample ceases to function during the test sequence, then mutual agreement shall be

reached between the test laboratory and the manufacturer as to which tests have to be repeated

with a replacement sample. The decision and its justification shall be described in the test

report.
---------------------- Page: 4 ----------------------
IEC 60079-29-1:2016/AMD1:2020 – 3 –
 IEC 2020
5.2.2.3 Sequence
Replace the existing text of 5.2.2.3 with the following new text:

The unpowered storage test (5.4.2) shall be conducted prior to all remaining tests. The vibration

test (5.4.12) shall be performed after the unpowered storage testing for pre-conditioning

purposes, except for the separate test samples used for the tests 5.4.4.3 to 5.4.4.6, 5.4.16,

5.4.20 and 5.4.21.

The tests 5.4.4.3 to 5.4.4.6 and 5.4.16 shall be conducted sequentially. All remaining tests may

be performed in any order.

If the design of equipment, which has been tested previously to this standard, is modified then

the test laboratory shall agree with the manufacturer which tests have to be repeated with the

modified equipment. The decision and its justification shall be described in the test report.

In the case of modifications to the software or of electronic components which are part of the

basic gas detection functionality (signal chain from sensor to output(s)) the following tests shall

be re-performed as a minimum: calibration curve, alarm set point(s), time of response.

5.4.21 Electromagnetic compatibility
Replace the existing text of 5.4.21 with the following new text:
5.4.21.1 Test

The equipment, including the sensor and interconnecting wiring, shall be subjected to the tests

described in IEC 61326-1:2012, Table 2.

NOTE Specific applications or local regulations might require more severe electromagnetic immunity test

parameters.

For equipment with a measuring range up to 100 %LFL or 5 % (v/v) methane, the test shall be

carried out with the equipment exposed to the standard test gas. The test gas(es) shall be

selected according to 5.3.2. If two or more test gases are selected, the test gas to which the

equipment has the lowest sensitivity shall be used for the tests, and the equipment shall be

adjusted to this test gas prior to the test. The alarm set point shall be set so that the alarm is

active, i.e. to the volume fraction of the standard test gas minus the variation as listed in

Annex A.

The application of standard test gas may be simulated (e.g. by inserting an absorbing filter into

the optical path of an infrared sensor or adjusting zero of a catalytic sensor) provided that the

sensitivity of the equipment is not changed. If the application of the standard test gas is

simulated, the test report shall include a justification that demonstrates that the simulation is

equivalent to the operating conditions when the standard test gas is used.

For multi-gas portable equipment, this test shall be performed with a full set of typical sensors.

For equipment with a measuring range up to 100 % (v/v), this test shall be performed in clean

air only. The alarm set point shall be set to 5 % of the measuring range or the lowest possible

setting, whichever setting is higher.
Any special advice in the instruction manual concerning EMC shall be followed.
---------------------- Page: 5 ----------------------
– 4 – IEC 60079-29-1:2016/AMD1:2020
 IEC 2020
5.4.21.2 Performance criteria

The following hierarchical performance criteria shall apply to all functions of the equipment

associated with the detection and measurement of gas:
Performance criterion A:

The equipment shall continue to operate as intended both during and after the test. The

performance requirements in Table A.1 shall be met. No spurious alarms or deactivation of

alarms is allowed.
Performance criterion B:
During the test:

• degradation of performance is allowed but the performance requirements given in Table A.1

shall not be exceeded, or
• the equipment shall show a specified fault indication and/or output.

After the test any degradation in performance shall be self-recoverable and the equipment shall

continue to operate as intended. No permanent change of actual operating state or stored data,

or continuous deactivation of the alarm is allowed.

If the equipment includes latching alarms or status signals, these may be triggered during the

test. After the test signal has been removed, the latching circuits shall be reset and the correct

operation of the alarm circuit verified by applying standard test gas.
Performance criterion C:

Temporary loss of function is allowed during the test, provided the loss of function is self-

recoverable or can be easily restored by the operation of the controls. The equipment shall

operate as intended after the test. No change of
...

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