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ABB 266DRH Differential Pressure Transmitter

I. Product Overview

II. Technical Specifications

III. Application Scenarios

1. Flow Measurement: Paired with primary elements (orifice plates, Venturi tubes, or pitot tubes) to measure flow rates of liquids, gases, or vapors in pipelines—e.g., crude oil flow in refineries, steam flow in power plants.
2. Tank Level Monitoring: Calculates liquid levels in closed tanks by measuring differential pressure between the tank top (vapor pressure) and bottom (liquid pressure)—used for chemical storage tanks or water treatment reservoirs.
3. Filter/Clog Detection: Monitors pressure drop across filters (e.g., oil filters in engines, water filters in municipal systems) to trigger alerts when clogs increase differential pressure beyond thresholds.
4. HVAC & Building Systems: Measures airflow pressure differences in ductwork (e.g., for VAV systems) or chiller water pressure to optimize energy efficiency and system performance.
5. Hazardous Environments: Optional ATEX/IECEx certification enables use in explosive areas (e.g., gas processing plants, pharmaceutical solvent tanks) where safe, reliable measurement is critical.

IV. Key Advantages

1. High Precision & Stability: Advanced sensor technology (capacitive or piezoresistive) ensures low drift (<0.1% of span/year) and consistent accuracy, even in fluctuating process conditions—critical for precision flow/level control.
2. Rugged & Corrosion-Resistant: 316L stainless steel or Hastelloy wetted parts withstand aggressive media (acids, alkalis) and high static pressures, extending service life in harsh industries.
3. Flexible Configuration: Wide DP range options, customizable process connections, and HART-based remote setup (no need for on-site calibration) adapt to diverse application needs.
4. Energy-Efficient 2-Wire Design: 2-wire 4-20mA operation reduces wiring costs and simplifies integration into existing process loops—no separate power cable required.
5. Comprehensive Diagnostics: Built-in fault detection (e.g., sensor overload, wiring issues) and drift monitoring enable predictive maintenance, minimizing unplanned downtime.

V. Usage Notes

1. Process Compatibility: Select appropriate sensor materials (e.g., Hastelloy for corrosive chemicals) to match the process fluid—avoid material incompatibility that could damage the diaphragm.
2. Installation Best Practices: Mount the transmitter at the same level as the process connection (or use impulse lines) to avoid hydrostatic errors; ensure impulse lines are free of air bubbles (for liquids) or liquid droplets (for gases).
3. Calibration: Perform initial calibration to match the specific DP range (e.g., 0-5 bar for a tank level application) using a HART communicator; schedule periodic recalibration (every 12-24 months) to maintain accuracy.
4. Overrange Protection: Avoid exceeding the transmitter’s maximum differential pressure rating—use pressure relief valves if process pressure spikes are likely (e.g., in steam systems).
5. Hazardous Area Compliance: For explosive zones, verify the transmitter’s ATEX/IECEx rating (e.g., Zone 1 vs. Zone 2) matches the area classification to ensure safety.
6. Impulse Line Maintenance: Regularly flush and inspect impulse lines (especially for viscous fluids) to prevent blockages that cause measurement errors or false readings.

The structure and details of the product：

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