User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R08 Objective Specification Design-in
Page 146 of 188
2.14 SARA-G350 ATEX integration in explosive atmospheres applications
2.14.1 General guidelines
SARA-G350 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] for further details), with
the following marking:
 Ex II 1G, Ex ia IIC/IIB
According to the marking stated above, the SARA-G350 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 modules is defined in the ‘Operating temperature range’
section of the SARA-G3 series Data Sheet [1].
Even if the SARA-G350 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 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
modules, 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 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.
The application device integrating a SARA-G350 ATEX module for use in potentially explosive atmospheres must
be designed so that any circuit/part of the apparatus shall not invalidate the specific characteristics of the type of
protection of the SARA-G350 ATEX module electrical equipment.
The intrinsic safety ‘i’ type of protection of SARA-G350 ATEX modules is based on the restriction of electrical
energy within equipment and of interconnecting wiring exposed to the explosive atmosphere to a level below
that which can cause ignition by either sparking or heating effects.