Reference Manual
00809-0100-4738, Rev DA
May 2006
Rosemount 3095FB
2-17
NOTES
• Do not run field wiring in conduit or open trays with other
non-transmitter power wiring, or near heavy electrical equipment.
• Shielded wiring is not required, but twisted pairs should be used for
best results. Twisted pair is required for RS-485 bus wiring.
• Runs under 1000 feet should be AWG 22 or larger. Runs from 1000 to
4000 feet should be AWG 20 or larger.
• Wiring should not exceed AWG 16.
• For connections in ambient temperatures above 140 °F (60 °C), use
wiring rated for at least 194 °F (90 °C).
• All connections should be made before applying power to the device.
To make connections, perform the following procedure:
1. Remove the housing cover on the side marked “FIELD TERMINALS.”
Do not remove the cover in explosive atmospheres when the circuit is
live. All power to the transmitter is supplied over the signal wiring.
2. Connect the lead that originates at the positive side of the power
supply to the terminal marked “+” and the lead that originates from the
negative side of the power supply to the terminal marked “–”. Avoid
contact with the leads and terminals.
3. Connect the lead that originates from the “A” line from the RS-485
bus to the terminal marked “A” and the lead that originates from the
“B” line to the terminal marked “B.”
4. Plug and seal unused conduit connections on the transmitter housing
to avoid moisture accumulation in the terminal side of the housing. If
you do not seal the unused connections, mount the transmitter with
the electrical housing positioned downward for drainage. Install wiring
with a drip loop. Arrange the drip loop so the bottom is lower than the
conduit connections and the transmitter housing.
5. Attach and tighten all housing covers. Transmitter covers must be
fully engaged to meet Explosion-Proof requirements and to achieve
the proper environmental seal.
For explosion-proof installations, wiring connections must be made per Appendix B.
For ALL installations, wiring connections must be made in accordance with local or
national installation codes such as the NEC NFPA 70.
Incorrect field wiring connections may damage the Rosemount 3095FB. Do not connect
power wiring to the RS-485 terminals.
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