Rosemount 644

The most versatile temperature transmitter

Reduce complexity and simplify the day-to-day operations of your diverse temperature applications with
the versatile Rosemount 644 family of temperature transmitters. Make better decisions for your process
with the new and easy-to-use Rosemount 644 Transmitter capabilities including: diagnostics, safety
certification, integral transient protection, and display options.

Features and benefits

Fulfill your needs within one model family with a customizable transmitter design

  • DIN head mount, field mount, and rail mount form factors
  • 4–20 mA/HART® with Selectable Revision 5 and 7, FOUNDATION Fieldbus or PROFIBUS® PA Protocol support
  • SIL3 Capable: IEC 61508 certified by an accredited thirdparty agency for use in safety instrumented systems up to SIL 3 [minimum requirement of single use (1oo1) for SIL 2 and redundant use (1oo2) for SIL 3]
  • Enhanced display with Local Operator Interface (LOI)
  • LCD display
  • Integral transient protection
  • Enhanced accuracy and stability
  • Transmitter-sensor matching with Callendar-Van Dusen constants
  • Variety of enclosures

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