Micro Motion Fisher-Rosemount RFT9709, Instruction Manual

Page: 25 / 74

RFT9709 Transmitter Instruction Manual
17
Wiring
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2.4 Output wiring Output wiring terminal designations are described in Table 2-2. Output
functions and wiring are described in detail through page 25. Follow
these general guidelines for output wiring:
• Use individually shielded pairs of 22 AWG (0.3 mm²) or larger wires for
connections between the RFT9709 and any peripheral device.
• Maximum wire length between the RFT9709 and any peripheral device
is 500 feet for 22 AWG wire (150 meters for 0.3 mm² wire), 50 feet for
28 AWG wire (15 meters for 0.1 mm² wire).
• Shields and/or drain wires must be terminated at the RFT9709 (see
Figure 2-9) or at the peripheral device.
Table 2-2.
Output-wiring terminal
designations
Figure 2-9.
Terminating output-wiring
shields and drains
WARNING
Failure to comply with requirements for intrinsic
safety in a hazardous area could result in an
explosion.
Output wiring is not intrinsically safe.
• Keep output wiring separated from power-supply wiring
and intrinsically safe sensor wiring.
• Follow all output wiring instructions to ensure the
RFT9709 and any connected devices will operate
correctly.
Terminals Function
11 and 12 Primary variable (PV) mA output
13 and 14 Secondary variable (SV) mA output
15 and 16 RS-485 I/O
17 and 18 Frequency/pulse output
19 and 18 Control output
20 and 18 Remote zero input
21 and 22 Pressure transmitter (or DP cell)
Terminate shields and/or drain wires at
mounting boss or ground nut, or
terminate them at peripheral device.
Mounting boss
#6-32 ground nut
09wire.fm Page 17 Monday, March 1, 1999 4:31 PM