Emerson Rosemount FOUNDATION 848T Quick Start Manual page 17

December 2021
3.2 Sensor wiring and power supply
• Compatible with eight independently configurable channels including
combinations of 2- and 3-wire RTDs, thermocouples, mV, ohm, and mA
sensors.
• All sensor and power terminals are rated to 42.4 Vdc.
• F
OUNDATION
32.0 Vdc and 22 mA maximum current draw.
• For best network performance twisted, shielded pair cabling should be
used. Proper gage wire should be selected to maintain the 9.0 Vdc
minimum.
Figure 3-2: Sensor Wiring Diagrams
1 2 3
2-wire RTD and
Ohms
(1) Emerson provides 4-wire sensors for all single-element RTDs. Use these RTDs in
3-wire configurations by clipping the fourth lead or leaving it disconnected and
insulated with electrical tape.
(2) The transmitter must be configured for a 3-wire RTD in order to recognize an
RTD with a compensation loop.
The wiring of 3-wire RTDs for this unit is different than some earlier
Rosemount 848T models. Pay careful attention to the wiring diagram on the
label, especially if this unit is replacing an older unit.
Quick Start Guide
Fieldbus network powered with a terminal voltage of 9.0–
1 2 3
3-wire RTD and
(1)
Ohms
1 2 3
Thermocouples/
Ohms and
millivolts
Quick Start Guide
1 2 3
2-Wire RTD with
compensation
(2)
loop
17