Rosemount Model 3144 and 3244MV Smart Temperature Transmitters
2-4
Field Wiring All power to the transmitter is supplied over the signal wiring. Signal
wiring does not need to be shielded, but twisted pairs should be used for
the best results. Do not run unshielded signal wiring in conduit or open
trays with power wiring, or near heavy electrical equipment. High
voltage may be present on the leads and may cause electrical shock.
To power the transmitter, follow the steps below.
1. Remove the transmitter covers. Do not remove the transmitter
covers in an explosive atmosphere when the circuit is alive.
2. Connect the positive power lead to the terminal marked “+” and
the negative power lead to the terminal marked “–” as shown in
Figure 2-3. When wiring to screw terminals, the use of crimped
lugs is recommended.
3. Tighten the terminal screws to ensure that good contact is made.
No additional power wiring is required.
4. Replace the transmitter covers. Both transmitter covers must be
fully engaged to meet explosion-proof requirements.
NOTE
Do not apply high voltage (e.g., ac line voltage) to the transmitter
terminals. Abnormally high voltage can damage the unit.
Figure 2-3. Transmitter Terminal Block.
Power/Current Loop
Connections
Use ordinary copper wire of sufficient size to ensure that the voltage
across the transmitter power terminals does not go below 12.0 V dc.
1. Connect the current signal leads as shown in Figure 2-4.
2. Recheck the polarity and correctness of connections.
3. Turn the power ON.
For information about multichannel installations, refer to page 2-6. For
information about intrinsically safe installations, refer to page 2-13.
See “Safety Messages” on page 2-1 for complete warning information.
Negative Terminal
Positive Terminal
Test Terminal
Ground Terminal
Sensor Terminals
3144-0200E01D
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