Rosemount™ 644 Temperature Transmitters offer reliable performance, improved usability, and increased application flexibility.
The Rosemount 644 Temperature Transmitter delivers industry proven reliability and offers excellent performance capabilities to meet your temperature measurement requirements. Choose from various form factors, enclosure styles, and materials for a customized product that fits your needs.
Avoid Unexpected Process Shutdowns
Basic and advanced diagnostic suites, enabled through Dual Input Capability, provide insight into health of measurement points to avoid possible safety issues:
• Hot Backup™: Seamless transfer from failed sensor to backup sensor
• Sensor Drift Alert: Indicates sensor issue before failure by monitoring delta between two sensors
• T/C Degradation: Identify degrading sensors and connections by monitoring sensor loop resistance and signal noise
• Min and Max Tracking: Records all temperature extremes of the sensor and transmitter electronics
Application Flexibility
Customize your transmitter to meet your application requirements:
• DIN A Head and Rail Mount form factors
• Aluminum, SS, Hygienic Polished SS and Polypropylene enclosures
• Single or Dual Sensor Input Capability
• Segmented LCD Display with optional Local Operator Interface (LOI)
• 5-year stability and 0.1 ºC (0.18 ºF) reference accuracy
• SIL 2/3 Safety Certification
• Callendar-Van Dusen transmitter-sensor matching improves accuracy by up to 75%
Input
Dual and single sensor capability with universal sensor inputs (RTD, T/C, mV, ohms)
Output Signal
4-20 mA /HART™ protocol, FOUNDATION™ fieldbus protocol, PROFIBUS™ PA protocol
Housing
Field mount, DIN A head mount or rail mount
Display/Interface
LCD Display, LCD Display with Local Operator Interface (LOI), or LED
Diagnostics
Basic diagnostics, Hot Backup™ capability, sensor drift alert, thermocouple degradation, min/max tracking
Calibration Options
Transmitter-sensor matching (Callendar-Van Dusen constants), 5-point calibration
Certifications/Approvals
SIL 2/3 certified to IEC 61508 by an independent 3rd party, hazardous location, marine type, see full specs for complete list of certifications
Features
- Extremely versatile temperature transmitter available in HART™, FOUNDATION™ Fieldbus or PROFIBUS™ protocols
- Diverse mounting configurations including head, field or rail mount with many enclosure options
- LOI option eliminates the need for special configuration tools (i.e. field communicator) for ease-of-use
- Transmitter-sensor matching with Callendar-Van Dusen constants reduces total measurement error
- Hot Backup™ capability and sensor drift alert with dual sensors ensure measurement integrity
- Thermocouple degradation diagnostic monitors thermocouple health to detect degradation before failure
- Minimum and maximum temperature tracking observes temperature extremes for easy troubleshooting
- Device dashboards provide easy interface for simplified device configuration and diagnostic troubleshooting
