Rosemount 644 Temperature Transmitter
Product Overview
The Rosemount 644 Temperature Transmitter is a versatile, head-mounted solution for accurate temperature measurement in industrial processes. Designed for RTDs, thermocouples, and millivolt inputs, it delivers high precision with 4-20 mA output and optional HART communication for seamless integration into control systems. Featuring advanced diagnostics and a compact aluminum or stainless steel housing, the 644 ensures reliable performance in harsh environments. Certified for hazardous areas and compliant with global standards, it is ideal for oil and gas, chemical, and power generation applications, providing cost-effective, maintenance-free operation.
Key Features
- High Accuracy: ±0.15°C (±0.27°F) for RTDs, ensuring precise temperature readings.
- Advanced Diagnostics: HART-enabled self-test and sensor drift detection for predictive maintenance.
- Versatile Input Support: Compatible with RTDs (Pt100 to Pt1000), thermocouples (Types B, E, J, K, N, R, S, T), and millivolt inputs (-10 to 100 mV).
- Compact Head-Mounted Design: Fits standard connection heads for easy installation.
- Robust Housing: Aluminum or stainless steel options with IP66/NEMA 4X protection.
- HART Communication: Enables remote configuration, monitoring, and troubleshooting.
- Low Power Consumption: Operates on 11–42 VDC for energy efficiency.
- Hazardous Area Certifications: FM, CSA, ATEX, IECEx for safe operation in explosive environments.
Technical Specifications
| Parameter |
Specification |
| Input Types |
RTDs (2-, 3-, 4-wire), Thermocouples (Types B, E, J, K, N, R, S, T), Millivolt (-10 to 100 mV) |
| Accuracy |
RTD: ±0.15°C (±0.27°F); Thermocouple: ±2.2°C (±3.96°F) |
| Output Signal |
4-20 mA HART (optional) |
| Supply Voltage |
11–42 VDC (HART: 16.75–42 VDC) |
| Temperature Range |
-40°C to +85°C (-40°F to +185°F) |
| Enclosure Rating |
IP66/NEMA 4X |
| Housing Materials |
Aluminum, Stainless Steel (316L) |
| Certifications |
FM, CSA, ATEX, IECEx, CE, SIL 2/3 |
| Humidity |
0–100% RH |
| Electrical Connections |
1/2-inch NPT |
| Weight |
0.8 kg (1.8 lbs) aluminum; 1.3 kg (2.9 lbs) stainless steel |
Applications
The Rosemount 644 Temperature Transmitter is optimized for accurate temperature measurement in diverse industrial settings:
- Oil and Gas: Monitors temperatures in pipelines, tanks, and refineries.
- Chemical Processing: Ensures precise control in reactors and distillation columns.
- Power Generation: Tracks steam and boiler temperatures for efficient operation.
- Food and Beverage: Hygienic temperature monitoring in processing and storage.
- Water Treatment: Reliable measurement in treatment and distribution systems.
Frequently Asked Questions
What input types does the Rosemount 644 support?
It supports RTDs (2-, 3-, 4-wire), thermocouples (Types B, E, J, K, N, R, S, T), and millivolt inputs (-10 to 100 mV).
Is the 644 suitable for hazardous areas?
Yes, it is certified for FM, CSA, ATEX, IECEx, and SIL 2/3 for safe operation in explosive environments.
How does HART communication benefit users?
It enables remote configuration, diagnostics, and troubleshooting, reducing maintenance costs.
What is the accuracy of the 644?
RTD accuracy is ±0.15°C (±0.27°F); thermocouple accuracy is ±2.2°C (±3.96°F).
Can the 644 be used in hygienic applications?
Yes, with stainless steel housing and hygienic approvals, it suits food and pharmaceutical industries.
Contact Us
For more information about the Rosemount 644 Temperature Transmitter, pricing, or to request a demo, contact our team:
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