IEC 60079-29-1:2016/AMD1:2020

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)

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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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-7966-3

– 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• withdrawn,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.
 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.

– 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 stored data is allowed.
If performance criterion C is required in IEC 61326-1:2012, the requirements are presumed to
be fulfilled if the equipment complies with performance criterion A or B.

 IEC 2020
Table A.1
Replace the row referring to Subclause 5.4.7 with the following new row:
5.4.7 Pressure
±0,2 % methane or ±5 % measuring range or ±10 % measuring range or ±5 % measuring range or ±5 % measuring range or
±30 % of indication ±30 % of indication from ±30 % of indication from ±30 % of indication from ±30 % of indication from
from 100 kPa 100 kPa 100 kPa 100 kPa 100 kPa
(test: 80 kPa, 100 kPa, (test: 80 kPa, 100 kPa, (test: 80 kPa, 100 kPa, (test: 80 kPa, 100 kPa, (test: 80 kPa, 100 kPa,
120 kPa) 120 kPa) 110 kPa) 110 kPa) 110 kPa))

Table A.1
Replace the row referring to Subclause 5.4.21 with the following new row:
Group I equipment limits (whichever value is
Subclause Test Group II equipment limits (whichever value is greater)
greater)
Full Scale Range up to Full Scale Range up to Full Scale Range up to Full Scale Range up to Full Scale Range up to
20 % lower flammable 100 % lower flammable
5 % methane in air 100 % methane in air 100 % gas
limit limit
5.4.21 Electromagnetic During the test During the test During the test During the test During the test
compatibility
Criterion A: Criterion A: Criterion A: Criterion A: Criterion A:
Variation less than Variation less than Variation less than Variation less than Variation less than
±0,15 % methane ±3 % measuring range ±10 % measuring range ±5 % measuring range ±5 % measuring range
Criterion B: Criterion B: Criterion B: Criterion B: Criterion B:
Variation less than Variation less than Variation less than Variation less than
Variation less than
±0,5 % methane ±20 % measuring range ±10 % measuring range ±10 % measuring range
±10 % measuring range
After the test After the test After the test After the test After the test
Criterion A and B: Criterion A and B: Criterion A and B: Criterion A and B: Criterion A and B:
Variation less than Variation less than Variation less than Variation less than Variation less than
±0,15 % methane ±3 % measuring range ±10 % measuring range ±5 % measuri
...