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 and FOUNDATION Fieldbus communications protocols, and a head mount or rail mount configurations, 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
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- 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
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| 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 |
| Key Specifications |
| Digital Accuracy |
+ 0.15° C (+0.27° F) for Pt100 RTD |
| D/A Accuracy |
+0.03% of span (HART only) |
| 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 |
| Output |
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2-wire, linear with temperature or input on 4-20 mA/HART signal |
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digital Input (ITK 4.6 compliant) | |
| Supply Voltage |
12 - 42.2V in HART Protocol
9 - 32V in FOUNDATION Fieldbus Protocol |
| Form Factors |
DIN A Headmount
Railmount | |
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