Rosemount 644 Temperature Transmitter

Engineered for versatility, the Rosemount 644 Temperature Transmitter is available with HART, FOUNDATION Fieldbus or PROFIBUS protocols in head, field or rail mount styles and a variety of enclosure options. By adding a Local Operator Interface (LOI), you can update your transmitter configuration in the field without tools. For diverse application requirements, this transmitter includes diagnostic capabilities, such as Hot Backup capability, sensor drift alert and thermocouple degradation.
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Product Details

Rosemount 644 HART Temperature Transmitters


Features with a customizable transmitter design

□DIN head mount, field mount, and rail mount form factors

□4–20 mA/HART® with Selectable Revisions, 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 Calendar-Van Dusen constants

□Variety of enclosures


HART head mount and field mount


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□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


HART rail mount


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□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


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□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



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□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


Connections Diagrams

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