<5. Wiring>
5-1
IM 01W03D01-01EN
5.
Wiring
5.1 Notes on Wiring
IMPORTANT
• Apply a waterproofing sealant to the threads
of the connection port. (It is recommended
that you use non-hardening sealant made of
silicon resin for waterproofing.)
• Lay wiring as far away as possible from
electrical noise sources such as large
transformers, motors and power supplies.
• Remove the wiring connection dust-caps
before wiring.
•
When you open the front panel, pay great
attention to the environmental conditions
in order to prevent dust and water droplets
entering inside the product.
• To run wiring to the sensor, pay sufficient
attention to the wiring parameters described
in section 2.6 “Installation of an Explosion
Protected Instrument.”
• To prevent electrical noise, the signal cable
and the power cable must not be housed in
the same conduit.
NOTE
• When wiring where the ambient temperature
is high or low, use the cable or wire that
appropriate to that place.
• When the maximum operating temperature
is more than 60°C, use the cable of 85°C or
higher temperature rating.
5.2 Cable Selection
5.2.1 Selection of the Input Cable
For wiring the HART device and the FN310, use
a shielded cable of AWG22 to 14. When connect
to the 4-20 mA loop, use a shielded cable also
in the 4-20 mA loop. The maximum length of the
input cable is 20 m. In the case of the 4-20 mA loop
connection, refer to Figure 5.1. Refer to subsection
5.5 “Grounding” for the grounding cable.
Distributor
Junction Box
Length of Input Cable
HART Device
FN110
FN310
F0501.ai
Figure 5.1
Length of Input Cable in 4-20 mA Loop
Connection
5.2.2 Selection of the Remote Antenna
Cable
Use a dedicated remote antenna cable specified
in the accessories of FN110 when installing the
FN310 and the FN110 separately. For details
of remote antenna cable, refer to General
Specifications of FN110 (GS 01W03B01-01EN).
