Rosemount 644 Temperature Transmitter

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.

Rosemount 644 Family of Transmitters

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

. DIN Head mount, field mount, and rail mount form factorsRosemount 644 Transmitters
. 4-20 mA/HART® with Selectable Revisions, FOUNDATION™ Fieldbus or PROFIBUS® PA Protocol
support
. SIL3 Capable: IEC 61508 certified by an accredited 3rd party 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

Rosemount 644 selection guide

Rosemount 644 HART Transmitters

HART head mount and field mount
. Single or Dual sensor inputs for RTD, Thermocouple, mV and Ohm
. DIN A Head mount and Field mount transmitters
. SIL3 Capable: IEC 61508 certified by an accredited 3rd party 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)

. LCD display
. Enhanced display with LOI
. Integral transient protection
. Diagnostic suite
. Enhanced accuracy and stability
. Transmitter–Sensor Matching with Callendar Van Dusen constants

HART rail mount
. Single sensor input for RTD, Thermocouple, mV and Ohm
. Custom alarm and saturation levels
. Transmitter–Sensor Matching with Callendar Van Dusen constants
. Hardware alarm switch

Rosemount 644 FOUNDATION Fieldbus
. Single sensor input for RTD, thermocouple, mV and Ohm
. DIN A Head mount transmitter
. Standard function blocks: two Analog Inputs, one PID and one Backup Link Active Scheduler (LAS)
. LCD display
. ITK 5.01 Compliant
. Transmitter–Sensor Matching with Callendar Van Dusen constants

Rosemount 644 PROFIBUS PA
. Single sensor input for RTD, thermocouple, mV and Ohm
. DIN A Head mount transmitter
. Standard function blocks: one physical, one transducer, and one analog output
. LCD display
. Compliant to PROFIBUS PA Profile 3.02
. Transmitter–Sensor Matching with Callendar Van Dusen constants

Easy to use human-centered designs to make your job simple
. Diagnostic information and process health at your finger tips with intuitive Device Dashboards (DD).
. Communication clips are easily accessible when an LCD display is attached.
. Easy wiring practices with captive sensor screw terminals, an optimized wiring diagram, and field mount enclosure option.

Optimize plant efficiency and increase visibility into the process with an expansive diagnostic offering
. Keep your process up and running with the Hot Backup™ feature where if your primary sensor fails, a second sensor seamlessly
takes over and prevents the measurement failure.
. Tighten control with Sensor Drift Alert that detects drifting sensors and pro-actively notifies the user.
. Enable predictive maintenance practices with Thermocouple Degradation Diagnostic that monitors the health of the
thermocouple loop.
. Improve quality with Minimum and Maximum Temperature Tracking that records temperature extremes of the process and the
ambient environment.

Rosemount 644 Ordering Information

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

Transmitter features include:
. HART/4–20 mA with Selectable Revision 5 and 7 selectable (option code A), FOUNDATION Fieldbus (option code F) or PROFIBUS PA (option code W)
. DIN A head mount, field mount, or rail mount transmitter styles
. Dual sensor Input (option code S)
. SIS SIL 2 Safety Certification (option code QT)
. LCD display (option code M5)
. LOI (option code M4)
. Advanced diagnostics (option codes DC and DA1)
. Enhanced transmitter accuracy and stability (option code P8)
. Transmitter-Sensor Matching (option code C2)

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