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Rosemount 644 Temperature Transmitter

Rosemount 644 Temperature Transmitter


The Rosemount 644 is a versatile temperature transmitter that
delivers field reliability and advanced accuracy to meet demanding
process needs.

Transmitter features include:

• HART / 4-20 mA, FOUNDATION fieldbus or Profibus PA protocols
• DIN A or Rail Mount transmitter types
• LCD Display (Option Code M5 or M6)
• Transmitter-Sensor Matching (Option Code C2)
• 3-Point Calibration Certificate (Option Code Q4)
• Assemble to Sensor options (Option Code XA)



Functional Specifications





User-selectable; sensor terminals rated to 42.4 Vdc. See

 “Accuracy” on page 12 for sensor options.


 Single 2-wire device device with either 4–20 mA/HART, linear with
temperature or input; or completely digital outputs with


 FOUNDATION fieldbus communication(ITK 5.01 compliant), or

 Profibus PA (compliant with profile 3.02).

Input/output isolation tested to 600 Vrms.

 Local Display
The optional five-digit integral LCD Display includes a floating or
fixed decimal point. It can also display engineering units (°F, °C,
°R, K, , and mV), mA, and percent of span. The display can be
configured to alternate between selected display options. Display
settings are preconfigured at the factory according to the standard
transmitter configuration. They can be reconfigured in the field
using either HART, FOUNDATION fieldbus or Profibus PA
Humidity Limits
0–99% relative humidity
Update Time
 0.5 sec.
Accuracy (default configuration) PT 100
HART (0-100 °C): ±0.18 °C
FOUNDATION fieldbus: ±0.15 °C
Profibus PA: ±0.15 °C