Emerson 644 Spécifications Page 69

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59
Reference Manual
00809-0200-4728, Rev RA
Section 4: Electrical Installation
April 2015
Electrical Installation
4.3.1 Sensor connections
The 644 is compatible with a number of RTD and thermocouple sensor types. Figure 4-2 shows
the correct input connections to the sensor terminals on the transmitter. To ensure a proper
sensor connection, anchor the sensor lead wires into the appropriate captive terminals and
tighten the screws.
Figure 4-2. Sensor Wiring Diagrams
*Rosemount Inc. provides a 4-wire sensors for all single element RTDs.
You can use these RTDs in 3-wire configurations by leaving the unneeded leads disconnected and insulated with electrical tape.
- HART Head Mount
- HART Rail Mount
- Fieldbus
- PROFIBUS
®
- HART Field Mount
+
+
1
2-wire
RTD and Ω
3-wire
RTD and Ω*
4-wire
RTD and Ω
T/C
and mV
234 4 4 4333222111
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