SMAR FI303, Operation, Maintenance & Instruction Manual

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Installation
WARNING
HAZARDOUS AREAS
In hazardous areas with explosion proof requirements, the covers must be tightened with at least 8 turns. In
order to avoid the penetration moisture or corrosive gases, tighten the O’ring until feeling the O'ring touching
the housing. Then, tighten more 1/3 turn (120
°
) to guarantee the sealing. Lock the covers using the locking
screw.
In hazardous zones with intrinsically safe or non-incentive requirements, the circuit entity parameters and
applicable installation procedures must be observed.
Cable access to wiring connections is obtained by the two conduit outlets. Conduit threads should be sealed
by means of code-approved sealing methods. The unused outlet connection should be plugged and sealed
accordingly.
Should other certifications be necessary, refer to the certification or specific standard for installation
limitations.
Figure 1.4 - Output Connections
Avoid routing signal wiring close to power cables or switching equipment.
The
FI303
is protected against reverse polarity, and can withstand ±35 V DC without damage, but it
will not operate when in reverse polarity.
NOTE
Please refer to the General Installation, Operation and Maintenance Procedures Manual for more
details.
Topology and Network Configuration
Wiring
Other types of cable may be used, other than for conformance testing. Cables with improved
specifications may enable longer trunk length or superior interface immunity. Conversely, cables
with inferior specifications may be used subject to length limitations for trunk and spurs plus possible
nonconformance to the RFI/EMI susceptibility requirements. For intrinsically safe applications, the
inductance/resistance ratio (L/R) should be less than the limit specified by the local regulatory
agency for the particular implementation.
1.3