Rosemount™ 644 Temperature Transmitter(rail mount)

The Rosemount™ 644 Temperature Transmitter is designed for high flexibility and reliable temperature measurement in a wide range of industrial applications. It supports multiple communication protocols, including HART™, FOUNDATION™ Fieldbus, and PROFIBUS™, and is available in head, field, and rail mount configurations with various enclosure options to suit different installation requirements.

With the optional Local Operator Interface (LOI), users can easily configure and update transmitter settings directly in the field without the need for additional tools. The transmitter also features advanced diagnostic functions to improve measurement reliability and maintenance efficiency, including Hot Backup™ capability, sensor drift alert, and thermocouple degradation detection, helping ensure continuous and accurate process monitoring.

•  Rail mount form factor
• 4–20 mA/HART® Revision 7
•  IEC 61508 certified by an accredited third-party agency for use in safety instrumented systems up to SIL 3
• Single or dual sensor inputs for RTD, T/C, mV, and ohm
• Diagnostic suite
•  Transmitter-sensor matching with Callendar-Van Dusen constants

Specifications