Rosemount 644 Temperature Transmitter
Part no.
The Rosemount 644 Temperature Transmitter is a versatile and industry-standard temperature transmitter designed for accurate and reliable temperature measurement in process, marine, offshore, and industrial applications.
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Rosemount 644 Temperature Transmitter
The Rosemount 644 Temperature Transmitter is a versatile and industry-standard temperature transmitter designed for accurate and reliable temperature measurement in process, marine, offshore, and industrial applications. Available in head-mount and rail-mount configurations, the transmitter supports HART™, FOUNDATION™ Fieldbus, and PROFIBUS™ PA communication protocols, allowing seamless integration into a wide range of automation systems.
Designed for maximum flexibility, the Rosemount 644 supports both single and dual sensor inputs and incorporates advanced diagnostic functions that help maintain measurement integrity, improve reliability, and reduce maintenance costs.
Key Features
- Supports HART™, FOUNDATION™ Fieldbus, and PROFIBUS™ PA protocols
- Available in head-mount and rail-mount versions
- Compatible with RTDs, thermocouples, mV, and resistance inputs
- Single and dual sensor capability
- Local Operator Interface (LOI) option for field configuration
- Advanced diagnostic functions
- Transmitter-sensor matching for improved accuracy
- Hot Backup™ capability for redundant measurement
- Sensor Drift Alert functionality
- Thermocouple degradation diagnostics
- Minimum and maximum temperature tracking
- SIL 2 and SIL 3 certified
- Suitable for hazardous and marine environments
Typical Applications
The Rosemount 644 is ideal for:
- Cargo tank temperature monitoring
- LNG and LPG systems
- Marine engine room applications
- Offshore platforms
- Refineries
- Petrochemical plants
- Power generation facilities
- Chemical processing systems
- Storage tank monitoring
- Industrial process temperature control
Technical Specifications
| Specification | Details |
|---|---|
| Product | Rosemount 644 |
| Type | Temperature Transmitter |
| Manufacturer | Emerson Rosemount |
| Mounting Options | DIN A Head Mount or Rail Mount |
| Input Types | RTD, Thermocouple (T/C), mV, Ohms |
| Sensor Capability | Single or Dual Sensor |
| Output Signals | 4-20 mA HART™, FOUNDATION™ Fieldbus, PROFIBUS™ PA |
| Display Options | LCD, LCD with LOI, LED |
| Diagnostics | Hot Backup™, Sensor Drift Alert, Thermocouple Degradation, Min/Max Tracking |
| Calibration Options | Transmitter-Sensor Matching, 5-Point Calibration |
| Functional Safety | SIL 2 / SIL 3 Certified |
| Approvals | Hazardous Area, Marine Type Approvals |
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