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Comprehensive Product Overview: Rosemount™ 644 Temperature Transmitter Display
1. Introduction to the Rosemount™ 644 Display
The Rosemount™ 644 Temperature Transmitter is a versatile industrial instrument designed for precision temperature measurement across demanding process environments. Its display system, available in Standard LCD and Advanced LCD with Local Operator Interface (LOI) configurations, enhances operational visibility, diagnostics, and configuration flexibility. Supporting HART® Protocol (Revisions 5 and 7), Foundation™ Fieldbus, or Profibus PA outputs, the 644 series integrates seamlessly into modern automation systems while providing critical data directly at the point of installation. The display options cater to diverse user needs-from basic process monitoring to advanced in-field configuration and troubleshooting.
2. Display Types and Key Features
(a) Standard LCD Display
Functionality: Displays primary variables (e.g., temperature readings), units (°C/°F), and status indicators (e.g., alarms, sensor faults).
Environmental Robustness: Rated for -40 to 85°C (-40 to 185°F), making it suitable for extreme conditions like cryogenic plants or high-heat industrial zones
Design: High-contrast screen with clear digit visibility under direct sunlight or low-light environments.
(b) Advanced LCD with Local Operator Interface (LOI)
Enhanced Capabilities:
Menu-Driven Navigation: Allows access to configuration, diagnostics, and calibration without external tools
Real-Time Data: Shows dual-sensor inputs (for 644S models) , average temperatures, and sensor health metrics
Diagnostic Alerts: Flags issues like sensor drift, open-circuit faults, or thermocouple degradation
User Interaction:
Intuitive Input: Supports text and numerical input via scroll-and-select keys.
Timeout Protection: Automatically reverts to default view after inactivity to prevent unauthorized changes
| Parameter | Specification |
| Operating Range | -40 to 85°C (-40 to 185°F) |
| Protocol Support | HART® 5/7, Foundation™ Fieldbus, Profibus PA |
| Input Compatibility | RTD (2/3/4-wire), TC, mV, Ω |
| Safety Certifications | SIL 2 (IEC 61508), ATEX, IECEx, FM/CSA |
| Display Resolution | 0.1° increments for precise readouts |
| Power Requirements | 10.5-42 V DC (4-20 mA loop-powered) |
| Enclosure Ratings | IP66/IP67 (dust/water resistant) |
4. Display Content and Visualization
The display dynamically presents:
Primary Process Variable (PV): Real-time temperature value.
Secondary Variables (SV): Includes sensor-specific data (e.g., sensor resistance for RTDs).
Diagnostic Flags: Icons for:
Sensor Failures: Open-circuit, short-circuit, or drift alerts
Maintenance Alerts: Thermocouple aging notifications based on historical performance
Operational Status: HART communication mode, fault mode (High/Low via hardware switch), and damping settings
Multi-Sensor Support: For dual-input models (644S), shows values for both sensors , or averaged temperatures
5. User Interaction and Configuration
(a) LOI Workflow Examples
Sensor Configuration:
Navigate: Configure > Manual Setup > Sensor > Type (e.g., Type K thermocouple).
Set damping (0-100 sec) to filter signal noise
Output Calibration:
Adjust analog output range (e.g., 4-20 mA mapping to 0-200°C) via Analog Outputs > Primary Variable Configuration
Security:
Password-protect critical settings to prevent unauthorized changes
(b) HART Integration
Handheld Communicators (e.g., HART 475): Directly access menus for guided setup, diagnostics, or simulation
PlantWeb™/AMS Suite: Remote monitoring and configuration via asset management software
6. Safety and Compliance in Display Operations
Explosion-Proof Design: Enclosure covers must be fully engaged in hazardous areas to meet ATEX/IECEx standards
SIS Compliance: The LOI supports SIL 2 workflows by enabling in-field verification tests (e.g., partial valve tests) without compromising safety integrity
Environmental Protection: Sealed electronics prevent moisture ingress, critical in corrosive or humid environments
7. Diagnostic Capabilities
The display system proactively identifies issues to minimize downtime:
Sensor Diagnostics:
Open-Circuit Detection: Alerts within 2 seconds of failure.
Intermittent Sensor Detection: Flags unstable connections before complete failure
Process Anomalies: Tracks min/max temperatures for trend analysis.
Transmitter Health: Monitors loop integrity, grounding faults, and power fluctuations
8. Advantages Over Competing Solutions
Transmitter-Sensor Matching (CVD Algorithm): Boosts accuracy by 75% by compensating for sensor nonlinearity.
Future-Proof Protocol Flexibility: Switch between HART 5 and 7 via LOI for backward/forward compatibility
Reduced Maintenance: Two-year stability calibration cycle lowers lifecycle costs.
9. Conclusion
The Rosemount™ 644 Display System sets a benchmark for reliability and versatility in industrial temperature monitoring. Its dual-display options bridge the gap between simple readouts and advanced in-field control, while integrated diagnostics and safety features align with Industry 4.0 demands. By enabling local configuration and real-time visibility, it empowers operators to optimize processes, reduce unplanned downtime, and maintain compliance in the most challenging environments.
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Company Achievements We supplied the tuning fork level gauge to the Rosemount factory and have been well received by the Beijing factory. We have cooperated with Yokowaga and maintained a cooperative relationship for 8 years, and our purchase quality has reached 7000 units. The companies we have cooperated with: 1. Awarded "Outstanding Supplier by Yanchang Petroleum in 2008 2. In December 2012, our company was awarded the "Excellent Equipment Service Award" for the expansion project of units 6 and 7 of the Guangdong Guohua Yuedaishan Power Plant 3. Awarded "Outstanding Supplier by Yaxing Group in 2013 4.200 transmitters for Haihua Group's ethylene debottlenecking transformation project in 2015. 5. In 2018, we were rewarded as a National Nuclear Power Instrumentation Industry Measurement and Testing Alliance member. 6.160 transmitters and 20 electric autuators for the Shandong Laigang Yongfeng Steel expansion project in 2019 7.In 2022, Jinneng Chemical (Qingdao) Co., Led/ Jinneng 2x450,000 tons/ year high-performance polypropylene project (newly built) equipped 460 transmitters from our company. 8. In 2022, Shandong Qinghe Chemical Technology Co., Ltd.s hydrogen peroxide method epoxy propane device and supporting hydrogen peroxide device expansion project used 253 pressure transmitters. 9.In 2022, the Wanhua Chemical HTN project NPG installed 320 transmitters and 50 sets of valve positioners. |
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