Rosemount 644 Head and Rail Mount Temperature Transmitters
The ideal temperature transmitter for any Single Point measurement application.
The Rosemount 644 offers a flexible and reliable solution to any temperature measurement. As a highly accurate transmitter that comes in either HART, FOUNDATION Fieldbus or PROFIBUS PA communication protocols, or a head mount or rail mount Form Factor, the Rosemount 644 is designed to meet your most demanding applications. An available LCD display provides local measurement indication and the Transmitter-Sensor Matching functionality provides unmatched accuracy for a transmitter and RTD sensor measurement point
Features & Benefits
Transmitter-Sensor Matching improves system accuracy up to 75%
LCD Meter provides convenient process and diagnostics indication
2-year stability for head and rail mount applications
Variety of enclosure options including polished stainless steel housings for biotechnology, pharmaceutical and other sanitary applications
Available as an installation-ready Complete Point Solution that includes a variety of sensors, thermowells and enclosures
 | Rugged EMC performance for reliable measurements – meets NAMUR NE 21 standards |
Custom Alarm and Saturation Levels | |
Available in Head or Rail Mount Form | |
Hardware Alarm Switch | |
Multi-Dropped for HART Control Systems | |
 | Standard function blocks: 2 Analog Inputs, 1 PID and 1 Backup Link Active Scheduler (LAS) |
Regulatory Control Suite 1 PID offers value and flexibility when generating control strategies. | |
FISCO Approvals for fieldbus installations | |
PlantWeb Alerts Available | |
18-bit analog-to-digital converter with ambient temperature compensation enhances performance and process quality | |
 | Compliant to Profibus PA Profile 3.02 |
Standard function blocks: 1 Physical, 1 Transducer, and 1 Analog Input | |
Custom Factory Configuration of the Address available | |
Standard and FISCO approvals for Profibus installations |
Specifications
| Digital Accuracy | + 0.15° C (+0.27° F) for Pt100 RTD |
D/A Accuracy | +0.03% of span | |
Ambient Temperature Effects | 0.003°C per 1.0°C (1.8°F) change in ambient (Pt100 RTD) | |
Stability | .15% of Reading or .15°C for 2 years | |
Input | 2-, 3-, and 4-wire RTDs, thermocouple, millivolt, ohm | |
Supply Voltage | 12 - 42.2V in HART Protocol | |
Form Factor | DIN A Head Mount or Rail Mount | |
| Digital Accuracy | + 0.15° C (+0.27° F) for Pt100 RTD |
Ambient Temperature Effects | 0.003°C per 1.0°C (1.8°F) change in ambient (Pt100 RTD) | |
Stability | .15% of Reading or .15°C for 2 years | |
Input | 2-, 3-, and 4-wire RTDs, thermocouple, millivolt, ohm | |
Supply Voltage | 9 - 32V in FOUNDATION Fieldbus Protocol | |
Form Factor | Head Mount | |
| Digital Accuracy | + 0.15° C (+0.27° F) for Pt100 RTD |
Ambient Temperature Effects | 0.003°C per 1.0°C (1.8°F) change in ambient (Pt100 RTD) | |
Stability | .15% of Reading or .15°C for 2 years | |
Input | 2-, 3-, and 4-wire RTDs, thermocouple, millivolt, ohm | |
Supply Voltage | 9 - 32V in FOUNDATION Fieldbus Protocol | |
Form Factor | Head Mount |