SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26
Design-in
Page 170 of 217
Other considerations
All the recommendations reported in section 2.14.1 must be considered for the implementation of the
VCC
supply circuit on application integrating SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX or SARA-U270
ATEX modules intended for use in potentially explosive atmospheres. Any specific applicable requirement for the
VCC
supply circuit design must be fulfilled according to all the exact applicable standards for the apparatus.
Check the detailed requisites on the pertinent norms for the application apparatus, as for example the IEC
60079-0 [34], IEC 60079-11 [35], IEC 60079-26 [36] standards.
2.14.3
Guidelines for antenna RF interface design
The RF output power of the SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX and SARA-U270 ATEX
modules transmitter is compliant to all the applicable 3GPP / ETSI standards, with a maximum output of 2 W RF
pulse power and 1.15 mJ RF pulse energy in 850/900 MHz bands and with a maximum output of 1 W RF pulse
power and 0.58 mJ RF pulse energy in the 1800/1900 MHz bands according to the GSM/GPRS power classes
stated in Table 2. The maximum average power of SARA-U270 ATEX, according to the WCDMA power class
stated in Table 3, is 250 mW.
The RF threshold power of the application device integrating a SARA-G340 ATEX, a SARA-G350 ATEX, a
SARA-U201 ATEX or a SARA-U270 ATEX module is defined, according to the IEC 60079-0 ATEX standard [34],
as the product of the effective output power of the module multiplied by the antenna gain (implemented/used
on the application device).
The RF threshold power of the application device integrating a SARA-G340 ATEX, a SARA-G350 ATEX, a
SARA-U201 ATEX or a SARA-U270 ATEX module, according to the IEC 60079-0 ATEX standard [34], must not
exceed the limits shown in Table 64.
Gas group II subdivision
RF threshold power limits according to the IEC 60079-0 ATEX standard
IIA (a typical gas is propane)
6.0 W
IIB (a typical gas is ethylene)
3.5 W
IIC (a typical gas is hydrogen)
2.0 W
Table 64: RF threshold power limits for the different gas group II subdivisions according to the IEC 60079-0 ATEX standard [34]
The system antenna(s) implemented/used on the application device integrating SARA-G340 ATEX,
SARA-G350 ATEX, SARA-U201 ATEX module or SARA-U270 ATEX module must be designed/selected so
that the antenna gain (i.e. the combined transmission line, connector, cable losses and radiating element
gain) multiplied by the output power of the module does not exceed the limits shown in Table 64.
