56
Reference Manual
00809-0200-4728, Rev SA
Operation and Maintenance
July 2018
Operation and Maintenance
Note
Do not apply high voltage (e.g., ac line voltage) to the transmitter terminals. Abnormally high voltage
can damage the unit. (Sensor and transmitter power terminals are rated to 42.4 Vdc. A constant 42.4
volts across the sensor terminals may damage the unit.)
For multichannel HART
®
installations, see above. The transmitters will accept inputs from a variety of
RTD and thermocouple types. Refer to Figure 2-6 on page 14 when making sensor connections.
The sensor wiring diagram is located on the device’s top label below the terminal screws. See Figure 4-1
and Figure 4-2 for where to find and how to correctly wire all sensor types to the Rosemount 644
Transmitter.
Figure 4-1. Wiring Diagram Location
4.3.1 Sensor connections
The Rosemount 644 Transmitter 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.
Rosemount 644 Head Mount Transmitter Rosemount 644 Field Mount Transmitter
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