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Description
Reduce complexity and simplify the day to day operations of your diverse temperature applications with the versatile Rosemount 644 family of temperature transmitters.
Make better decisions for your process with the new and easy to use Rosemount 644 Transmitter capabilities including: diagnostics, safety certification, integral transient protection and display options.
The Rosemount 644 is a Versatile Temperature Transmitter that delivers field reliability and advanced accuracy and stability to meet demanding process needs.
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
Configure
Specifications
Specifications
Brand
Accuracy
- ± 0.03 % of Span
Alarm
- NAMUR Alarm & Saturation Signal Levels
Approvals & Certifications
- ATEX
- CSA
- FM
- IEC Ex
- INMETRO
- TIIS
Conduit Connection
- A Size Mini, 4-Pin Male Connector (minifast)
- M12, 4-Pin, Male Connector (eurofast)
Configuration
- FOUNDATION Fieldbus Protocols
- HART Protocols
- PROFIBUS PA Protocol
Damping Adjustment
- 0 seconds Default
Display
- LCD Display
- LCD Display with Local Operator Interface
Electrical Connectors
- Compression Screws Permanently Fixed to Terminal Block
Electromagnetic Interference Effect
- Meets All Relevant Requirements of EN 61326 & NAMUR NE-21
Enclosure Finish
- Polyurethane Paint
Enclosure, Body Material
- Aluminum
- Cast Stainless Steel, Polished Stainless Steel
Environmental Protection
- IP66
- IP68
- NEMA 4X / IP66, 68
Humidity
- 0 to 95 % Relative Humidity
Input Power
- 42.4 Vdc
Mounting
- 316 Stainless Steel U-bolt Mounting Bracket with 2” Pipe Mount
- L' Mounting Bracket for 2” Pipe or Panel Mounting
O-Ring Material
- Buna-N
Operating Temperature
- -40° to 85° C (-40° to 185° F)
Output
- 2-Wire 4-20 mA
Power Supply Effect
- ± 0.005 % of Span Per Volt
Process Temperature
- 55° to 450° C (131° to 842° F)
Sensor, Probe Connection
- 2-Wire
- 3-Wire
- 4-Wire
- T/C & mV
Sensor, Probe Type
- B Thermocouple
- DIN Typical L
- DIN Typical U
- E Thermocouple
- GOST L
- J Thermocouple
- K Thermocouple
- N Thermocouple
- R Thermocouple
- S Thermocouple
- T Thermocouple
- Typical W5Re/W26Re
Stability
- ± 0.15 % of Output Reading or 0.15° C (32.3° F) whichever is greater, for 24-months
Storage Temperature
- -50° to 120° C (-58° to 248° F)
Temperature Effect
- 0.001 % of Span
Vibration Effect
- Frequency: 60 to 1000 Hz = Vibration: 5 G (50 MPS²) Peak Acceleration
Documentation
Documentation
Data Sheets
Product Manuals
- Manual: Rosemount 644 Temperature Transmitter with FOUNDATION fieldbus pdf 1.6 MB
- Manual: Rosemount 644 Temperature Transmitter with HART Protocol pdf 7.4 MB
- Manual: Rosemount 644 Temperature Transmitter with HART protocol (Shipped Sept 2012 and Later) pdf 3.4 MB
- Manual: Rosemount 644 Temperature Transmitter with PROFIBUS PA pdf 2.3 MB
- Quick Start Guide: Rosemount 644H and 644R Smart Temperature Transmitters pdf 1.4 MB
- Quick Start Guide: Rosemount 644H Profibus PA Temperature Transmitters pdf 1.1 MB
- Quick Start Guide: Rosemount 644H Temperature Transmitter with 4-20 mA HART (Revision 5 and 7) Protocol pdf 1.5 MB
- Quick Start Guide: Rosemount 644H Temperature Transmitters with Foundation Fieldbus pdf 1.1 MB
