Rosemount 644 Head Mount Temperature Transmitter

Features and benefits

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

■ DIN head and field 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 third 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

Access information when you need it with asset tags

Newly shipped devices include a unique QR code asset tag that enables you to access serialized information directly from the device. With this capability, you can:

■ Access device drawings, diagrams, technical documentation, and troubleshooting information

■ Improve mean time to repair and maintain efficiency

■ Ensure confidence that you have located the correct device

■ Eliminate the time-consuming process of locating and transcribing nameplates to view asset information

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 third 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 

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

■ Integral transient protection 

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 fingertips 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 proactively 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.

Product Parameters

Packaging & Shipping

Packaging: Original bag and box