User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
2.14 SARA-G350 ATEX and SARA-U270 ATEX integration in explosive
atmospheres applications
2.14.1 General guidelines
SARA-G350 ATEX and SARA-U270 ATEX modules are certified as components intended for use in potentially
explosive atmospheres (see section 4.5 and see the ‘Approvals‘ section of the SARA-G3 series Data Sheet [1] and
SARA-U2 series Data Sheet [2] for further details), with the following marking:
• Ex II 1G, Ex ia IIC/IIB
According to the marking stated above, SARA-G350 ATEX and SARA-U270 ATEX modules are certified as
electrical equipment of:
• group ‘II’: intended for use in areas with explosive gas atmosphere other than mines susceptible to firedamp
• category ‘1G’: intended for use in zone 0 hazardous areas, in which explosive atmospheres caused by
mixtures of air and gases, vapours or mists are continuously present, for long periods or frequently, so that
the modules are also suitable for applications intended for use in zone 1 and zone 2 hazardous areas
• level of protection ‘ia’: intrinsically safe apparatus with very high level of protection, not capable of causing
ignition in normal operation and with the application of one countable fault or a combination of any two
countable fault plus those non-countable faults which give the most onerous condition
• subdivision ‘IIC/IIB’: intended for use in areas where the nature of the explosive gas atmosphere is
considered very dangerous based on the Maximum Experimental Safe Gap or the Minimum Ignition Current
ratio of the explosive gas atmosphere in which the equipment may be installed (typical gases are hydrogen,
acetylene, carbon disulphide), so that the modules are also suitable for applications intended for use in
subdivision IIB (typical gases are ethylene, coke oven gas and other industrial gases) and subdivision IIA
(typical gases are industrial methane, propane, petrol and the majority of industrial gases)
The temperature range of use of SARA-G350 ATEX and SARA-U270 ATEX modules is defined in the ‘Operating
temperature range’ section of the SARA-G3 series Data Sheet [1] and SARA-U2 series Data Sheet [2].
Even if SARA-G350 ATEX and SARA-U270 ATEX modules are certified as components intended for use in
potentially explosive atmospheres as described above, the application device that integrates the module must be
approved under all the certification schemes required by the specific application device to be deployed in the
market as apparatus intended for use in potentially explosive atmospheres.
The certification scheme approvals required for the application device integrating SARA-G350 ATEX or
SARA-U270 ATEX modules, intended for use in potentially explosive atmospheres, may differ depending on the
following topics:
• the country or the region where the application device must be deployed
• the classification of the application device in relation to the use in potentially explosive atmospheres
• the classification of the hazardous areas in which the application device is intended for use
Any specific applicable requirement for the implementation of the appratus integrating SARA-G350 ATEX
module or SARA-U270 ATEX module, intended for use in potentially explosive atmospheres, must be
fulfilled according to the exact applicable standards: check the detailed requisites on the pertinent
normatives for the application, as for example the IEC 60079-0 [32], IEC 60079-11 [33], IEC 60079-26
[34] standards.
The certification of the application device that integrates a SARA-G350 ATEX module or a
SARA-U270 ATEX module and the compliance of the application device with all the applicable
certification schemes, directives and standards required for use in potentially explosive atmospheres are
the sole responsibility of the application device manufacturer.
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