Rosemount 644 Temperature Transmitter
The Rosemount 644 temperature transmitter offers versatile functionality and can use HART®, FOUNDATION™ fieldbus, or PROFIBUS® protocols
Key words:
transmitter
diagnostic
interface
Classification:
Rosemount temperature transmitter
MANUALS & GUIDES ：
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Detailed introduction
The Rosemount 644 temperature transmitter is versatile, capable of using HART®, FOUNDATION™ fieldbus, or PROFIBUS® protocols, with top, field, or rail mounting styles and various housing options. By adding a Local Operator Interface (LOI), the transmitter configuration can be updated on-site without tools. This transmitter also includes diagnostic features such as Hot Backup™, sensor drift warnings, and thermocouple performance degradation to meet various application needs.
Here are the key features of the Rosemount 644 Temperature Transmitter that make it a standout in precision temperature measurement:
🌡️ Measurement & Sensor Flexibility
Universal input support: RTDs, thermocouples (TCs), millivolts (mV), and ohms.
Dual sensor capability: Enables Hot Backup™ and sensor drift alert—ideal for critical applications.
Transmitter-sensor matching: Callendar-Van Dusen constants improve measurement accuracy.
⚙️ Configuration & Diagnostics
Local Operator Interface (LOI): Configure without needing a handheld communicator.
Advanced diagnostics: Monitor thermocouple degradation and track min/max temperatures.
Temperature alerts: Set up alerts for deviations or failures, aiding in predictive maintenance.
📡 Communication & Integration
Protocol options: HART®, FOUNDATION™ Fieldbus, and PROFIBUS® PA.
Loop-powered or bus-powered options, depending on protocol and mounting.
🔐 Safety & Reliability
SIL 2/3 capability: Certified per IEC 61508 for use in safety instrumented systems.
Robust design: High resistance to vibration, moisture, and electrical interference.
🧩 Mounting Options
Available in head, field, and rail mount configurations—offering installation flexibility.
| Parameter | Specification |
|---|---|
| Sensor Input Types | RTD, Thermocouple (TC), mV, Ohm |
| Sensor Connections | 2-, 3-, or 4-wire RTDs |
| Dual Sensor Capability | Yes – enables Hot Backup™ and sensor drift alert |
| Input Range | –200 to 850 °C (RTD); TC range depends on type |
| Accuracy (RTD with Callendar-Van Dusen) | Up to ±0.035 °C |
| Ambient Temperature Limits | –40 to 85 °C |
| Output Protocols | HART®, FOUNDATION™ Fieldbus, PROFIBUS® PA |
| Power Supply | 11.9–42.4 VDC (HART); depends on protocol and configuration |
| Mounting Styles | Head, field, or rail mount |
| Configuration Options | Local Operator Interface (LOI), AMS Device Manager, handheld communicator |
| Diagnostics | TC degradation, min/max temp tracking, sensor matching, loop testing |
| Certifications | SIL 2/3 (IEC 61508), ATEX, FM, CSA, IECEx (varies by model) |
| Enclosure Rating | IP66/IP68 (with appropriate housing) |
📘 Rosemount 644 Temperature Transmitter – FAQ
Q1: What types of sensors can the Rosemount 644 accept?
A: It supports RTDs, thermocouples (TCs), millivolt (mV), and resistance (ohm) inputs.
Q2: Can it handle dual sensors?
A: Yes, it supports dual sensor input for Hot Backup™ and sensor drift detection.
Q3: What communication protocols are available?
A: HART®, FOUNDATION™ Fieldbus, and PROFIBUS® PA.
Q4: How is the transmitter configured?
A: Via Local Operator Interface (LOI), handheld communicator, or AMS Device Manager.
Q5: Is it suitable for safety-critical applications?
A: Yes, it’s SIL 2/3 certified per IEC 61508, making it suitable for safety instrumented systems.
Q6: What mounting options are available?
A: Head mount, field mount, and rail mount configurations.
Q7: What diagnostics are included?
A: It offers thermocouple degradation detection, min/max temperature tracking, and sensor matching.
Q8: What is the typical accuracy?
A: With RTD and Callendar-Van Dusen constants, accuracy can be as high as ±0.035 °C.
Q9: What is the ambient operating temperature range?
A: –40 to 85 °C, depending on configuration.
Q10: Is it compatible with Rosemount sensors and thermowells?
A: Yes, it integrates seamlessly with Rosemount 214C RTDs, thermocouples, and 114C/114P thermowells.
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