Rosemount™ 644 Temperature Transmitter(head mount)

The Rosemount 644 Head Temperature Transmitter is designed to provide highly reliable and flexible temperature measurement for a wide range of industrial processes. It supports multiple communication protocols including HART™, FOUNDATION™ Fieldbus, and PROFIBUS™, allowing seamless integration with modern control systems. The transmitter can be installed in various mounting configurations such as head, field, or rail mount, with several enclosure options to meet different installation requirements. An optional Local Operator Interface (LOI) enables easy field configuration without the need for specialized tools. To improve measurement accuracy, the device supports transmitter–sensor matching using Callendar‑Van Dusen constants, which helps reduce overall measurement error.