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The Rosemount 644 Head and Rail Mount Temperature Transmitters Are Ideal For Your Control Applications
The 644 Head Mount is Now Available with FOUNDATIONTM Fieldbus  

The Rosemount 644 is designed for use in control applications where the loss of the temperature points may be detrimental.  These highly accurate temperature transmitters are available in a variety of mounting styles, field housings, and communication protocols to meet your demanding installation requirements. Each Rosemount 644 transmitter is a 2-wire design providing either a 4–20 mA/HART or a Foundation Fieldbus output.

  • Transmitter-Sensor Matching improves system accuracy up to 75%. 
     
  • Convenient process and diagnostics indication available with an integral LCD Meter.
     
  • 2-year stability for head and rail mount applications.
     
  • Polished stainless steel housing for biotechnology, pharmaceutical and other sanitary applications.  Download the Rosemount 644H Sanitary Housing Flyer   (PDF @ 6.1 MB) 
     
  • Available as an installation-ready solution that includes a variety of sensors, thermowells, and enclosures. 

 

644 Protocol Specific Features

HART

FOUNDATIONTM Fieldbus     

Rugged EMC performance for reliable measurements – meets NAMUR NE 21 standards  Standard function blocks: 2 Analog Inputs, 1 PID and 1 Backup Link Active Scheduler (LAS) 
Custom Alarm and Saturation Levels Regulatory Control Suite 1 PID offers value and flexibility when generating control strategies. 
Available in Head or Rail Mount Form FISCO Approvals for fieldbus installations
Hardware Alarm Switch PlantWeb Alerts Available
Multi-Dropped for HART Control Systems 18-bit analog-to-digital converter with ambient temperature compensation enhances performance and process quality
Supply Voltage: 12 - 42.2V Supply Voltage: 9 - 32V

Rosemount 644 FOUNDATIONTM Fieldbus Key Specifications
Accuracy + 0.15° C (+0.27° F) for Pt100 RTD
Ambient Temperature  Effects 0.003°C per 1.0°C change in ambient temperature for Pt100 RTD
2-year Stability + 0.15% of reading or 0.15° C, whichever is greater
Inputs  2-, 3-, and 4-wire RTDs, thermocouple, millivolt, ohm 
Vibration Approvals 60 - 500 Hz at 3 g

More Information

FOUNDATION® Fieldbus is here!
 
Whether you're automating a new plant or upgrading an existing one, now you can choose the right long-term solution -- and start seeing savings and performance improvements right away.

Learn more about the Emerson Process Management FOUNDATION fieldbus offering today!

 
Looking for a Temperature Complete Point Solution?
 
Rosemount offers a wide variety of sensors, thermowells, connection heads, and more
.
 
Fisher-Rosemount PlantWeb™ Architecture

PlantWeb is the architecture that uses the power of intelligent field devices to improve plant performance. The Fisher-Rosemount DeltaV system with AMSinside optimizes the field device intelligence during startup, operation, and maintenance. FOUNDATION fieldbus allows the implementation of PID control in the field device. Moving control closer to the process improves loop performance, reduces plant variability, and greatly reduces the necessary size of the control rooms.

Technical Documentation

AMS Install Kits 

Installation Procedure
Device Description / Capabilities Files

644 Rev 1
DeltaV / AMS Support Files
Archive - Previous Files


Emerson Process Management, Rosemount Division, 8200 Market Blvd. Chanhassen, MN USA 55317
North America: 1-800-999-9307    International: 952-906-8888  Fax:  952-949-7001

 
 

Contact Emerson Process Management,
Rosemount Division


Last Updated 11/19/08 


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