Rosemount™ 644 Temperature Transmitter (field mount)

The Rosemount 644 Temperature Transmitter is a high‑performance and highly versatile temperature measurement device designed for industrial applications requiring accuracy, reliability, and advanced diagnostics. It is available in head‑mount, field‑mount, and rail‑mount configurations with communicatio options such as HART™, FOUNDATION™ Fieldbus, and PROFIBUS™, making it suitable for integration with various control systems.

Features

• Highly versatile temperature transmitter supporting HART™, FOUNDATION™ Fieldbus, and PROFIBUS™ communication protocols
• Optional Local Operator Interface (LOI) for easy configuration in the field without the need for special tools
• Transmitter–sensor matching using Callendar‑Van Dusen constants to minimize overall measurement error
• Hot Backup™ capability with dual sensors to maintain measurement integrity in critical applications
• Diagnostic alerts including sensor drift detection and thermocouple degradation monitoring
• Minimum and maximum temperature tracking for simplified troubleshooting
• Intuitive device dashboards for easy configuration and diagnostic operations

Applications

The Rosemount 644 is widely used across industries for precise and reliable temperature measurement in demanding environments. Typical applications include:

• Refining, petrochemical, and chemical process units
• Power generation plants (steam, gas turbine, and boiler systems)
• Oil & gas production and pipeline monitoring
• Food & beverage, pharmaceutical, and water industries
• General industrial heating, cooling, and thermal control systems

Specifications

• Model and Manufacturer: Rosemount 644HAK1J1B4M5CNC4Q4QTT1HR7K1105 Temperature Transmitter
• Type of Temperature Transmitter: Field‑mount (with display)
• Input Sensor Types: RTDs (PT100, …), Thermocouples, Ohm, Millivolt
• Output / Communication Protocol: 4–20 mA (HART)
• Display: Yes
• Supply Voltage: 12–42 V
• Connection Size: 1/2″
• Enclosure Protection Rating (IP): IP68
• Explosion Protection Approval (Ex): Yes