User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information Design-in
Page 161 of 206
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-G340 ATEX, a SARA-G350 ATEX, a SARA-U201 ATEX or a
SARA-U270 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 module.
The intrinsic safety ‘i’ type of protection of SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX and SARA-
U270 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.
The following input and equivalent parameters must be considered integrating a SARA-G340 ATEX, a SARA-
G350 ATEX, a SARA-U201 ATEX or a SARA-U270 ATEX module in an application device intended for use in
potentially explosive atmospheres:
x Total internal capacitance, Ci
x Total internal inductance, Li
x The module does not contain blocks which increase the voltage (e.g. like step-up, duplicators, boosters, etc.)
The nameplate of SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX and SARA-U270 ATEX modules is
described in the ‘Product labeling’ section of the SARA-G3 series Data Sheet [1] and SARA-U2 series Data
Sheet [2]. Additional information can be found on the SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX
and SARA-U270 ATEX modules’ certificate of compliancy for use in potentially explosive atmospheres available
on our website (www.u-blox.com
).
The final enclosure of the application device integrating SARA-G340 ATEX, SARA-G350 ATEX, SARA-
U201 ATEX or SARA-U270 ATEX modules, intended for use in potentially explosive atmospheres, must
guarantee a minimum degree of ingress protection of IP20.
2.14.2 Guidelines for VCC supply circuit design
The power supply ratings, average and pulse, must be considered in the design of the VCC supply circuit on the
application device integrating SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX or SARA-U270 ATEX
module, implementing proper circuits providing adequate maximum voltage and current to the VCC supply input
of the modules, according to the specific potentially explosive gas atmosphere category subdivision where the
apparatus is intended for use.
Table 61 lists the maximum input and equivalent parameters that must be considered in sub-division IIC for
SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX and SARA-U270 ATEX.
Parameter
SARA-G350 ATEX
SARA-G340 ATEX
SARA-U270 ATEX
Ui
3.8 V
3.8 V
Ii
1.6 A (burst)
1.6 A (burst)
Pi
2.5 W
3.5 W
Ci
103 μF
132 μF
Li
4.1 μH
9.8 μH
Table 61: Maximum input and equivalent parameters for sub-division IIC
Table 62 lists the maximum input and equivalent parameters that must be considered in sub-division IIB and IIA
for SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX and SARA-U270 ATEX.