Rosemount 644 Hart/644 Foundation/644 Profibus PA 644 Temperature Transmitter

• Customization: Available
• Type: Temperature Transmitter
• Structure Type: Temperature Transmitter
• Model NO.: Rosemount 644 Temperature Transmitter
• Measuring Medium: Temperature
• Accuracy Grade: 0.2G
• Pressure range: 0～1.5kPa
• IP Rating: IP68
• Certification: CE
• Customized: Customized
• Place of Origin: China
• Brand Name: Rosemount
• Model Number: 644
• Customized Support: OEM, ODM, Obm
• Warranty: 1 Year
• Keywords: 100% Original Brand
• Mounting: Head/Field/DIN Rail
• Enclosure: Alum./Ss, IP66/NEMA 4X
• Ambient Temp.: -40°c to 85°c
• Certif.: ATEX, Iecex, Sil 2/3
• Response Time: <100 Ms
• Damping: Adjustable (0–100 S)
• Wiring: 2-Wire
• Sensor Break Detect: Yes
• Calibration: Remote/Manual
• Transport Package: 100% Original Product
• Specification: 20cm*20cm*15cm
• Trademark: Rosemount
• Origin: China
• HS Code: 9025191090
• Production Capacity: 1000pieces/Year
• Package Size: 20.00cm * 20.00cm * 15.00cm
• Package Gross Weight: 4.000kg

Product Description

Product Description

Model	644
Type	Temp. Xmtr (RTD/Thermo.)
Input	RTD (Pt100, Pt200, etc.), TC (J, K, T, etc.)
Output	4–20 mA HART

1. Introduction: Precision Measurement for Demanding Applications

The Rosemount 644 Temperature Transmitter represents a significant advancement in industrial temperature measurement technology. Engineered by Emerson, a global leader in process automation solutions, the 644 series is designed to deliver exceptional accuracy, reliability, and ease of use across a vast spectrum of demanding process environments. It serves as the critical link between temperature sensors (like RTDs and thermocouples) and control systems, converting the low-level sensor signal into a robust, noise-immune 4-20 mA analog output or digital signal via HART® 7, FOUNDATION™ Fieldbus, or PROFIBUS PA protocols. Core to its design is the ability to provide highly precise temperature data, essential for optimizing process control, ensuring product quality, enhancing safety, and maximizing operational efficiency. Whether deployed in oil & gas production, refining, chemical processing, power generation, or pharmaceutical manufacturing, the Rosemount 644 is built to withstand harsh conditions while minimizing maintenance requirements and reducing total cost of ownership.

2. Unmatched Technical Capabilities and Performance

The Rosemount 644 sets a high benchmark for technical performance in temperature measurement. Its core strength lies in its industry-leading accuracy, achieving ±0.05% of span or better, depending on the model and sensor type. This exceptional precision is crucial for processes where minor temperature variations significantly impact yield, safety, or energy consumption. The transmitter boasts an extensive operating temperature range (-50°C to +85°C / -58°F to +185°F ambient), ensuring reliable performance in extreme climates. It features advanced sensor diagnostics that continuously monitor sensor health, detecting issues like open circuits, short circuits, and RTD degradation, enabling predictive maintenance and preventing costly process disruptions. 

3. Advanced Features Enhancing Usability and Connectivity

Beyond core measurement, the Rosemount 644 integrates sophisticated features that simplify installation, configuration, and integration while providing deeper process insights. Intrinsic safety is a cornerstone, with certifications enabling deployment in hazardous areas (Class I, Div 1 & 2; Zone 0, 1 & 2) critical for oil, gas, and chemical industries. The intuitive, menu-driven local interface (LUI) with a bright backlit display allows for easy on-site configuration, calibration verification, and diagnostics without needing specialized tools. Full HART 7 compatibility ensures seamless integration with existing control systems and enables advanced communication capabilities, including device status, process variables, and comprehensive diagnostic data accessible remotely via asset management software like AMS Device Manager. For modern digital architectures, 

4. Tangible Business Advantages and Operational Value

Choosing the Rosemount 644 Temperature Transmitter translates directly into significant business benefits and operational value. Its industry-leading accuracy minimizes measurement uncertainty, leading to tighter process control, improved product quality consistency, reduced waste, and optimized energy usage – directly impacting the bottom line. Advanced diagnostics and predictive maintenance capabilities dramatically reduce unplanned downtime by identifying potential sensor or wiring failures before they cause process trips, maximizing asset availability and plant throughput. The inherent reliability and robust design significantly extend mean time between failures (MTBF), lowering spare parts inventory and maintenance labor costs. Simplified installation and configuration procedures, aided by the local interface and standardized mounting, reduce commissioning time and costs. Compliance with stringent global safety standards (IEC 61508, IEC 61511, FM, CSA, ATEX, IECEx) ensures personnel safety and regulatory adherence, mitigating operational risk. Ultimately, the Rosemount 644 delivers a compelling return on investment through enhanced process performance, minimized operational costs, reduced risk, and maximized uptime, solidifying its position as a premier solution for critical temperature measurement applications worldwide.

Specification

Packaging & Shipping

Company Profile

KeRui (weifang) Automation Equipment Co., Ltd. specializes in industrial automation instrument development, production and sales, technical services, and supportingequipment supply of specialized companies. The main products are flow meters, level meters, temperature meters, pressure meters, electrical meters, thermal intelligent meters, programmable controllers (PLC), DCS distributed control systems,and eight series of more than 1,000 specifications. Its products and technologies are widely used in electric power, metallurgy, petrochemicals, environmental textile, dyeing, and other fields.protection, plastics, food, printing, tobacco,textile, dyeing, and other fields.

FAQ

Q: How long will you give me the reply?

A: We will reply to you as soon as we see the information.

 

Q: What is the delivery time?

A:The products in stock will be shipped after receiving the payment, and the products that

need to be ordered are subject to the factory time.

 

Q: How about your package?

A: Do not worry about the package, we have rich experience in packing.

 

Q: How about the payment terms?

A:You can choose T/T.

 

Q: What is the MOQ?

A:1PC.

 

Q: Can l get a lower price if l order large quantities?

A: Yes, cheaper prices with more bigger size orders.

 

Q:After sales and warranty?

A: We provide one year warranty lifetime technical support services.