ABB’s 266 Multivariable Pressure Transmitters are advanced, high-performance instruments designed to measure three key process variables; differential pressure, static (absolute) pressure, and process temperature, in a single device. This integration enables dynamic compensation and precise calculation of mass flow, standard volume flow, heat flow, and temperature-compensated level measurement for gases, steam, and liquids.

Key Features:

• Multisensor Technology: Combines DP, SP, and temperature sensing for comprehensive process insight.
• High Accuracy:
  • DP: ±0.075% of span
  • SP: ±0.05% of URL
  • Temperature: ±0.3 K (via external Pt100 RTD)
• Wide Measurement Ranges:
  • DP up to 1450 psi
  • SP up to 5945 psi
  • Temperature from -200 °C to +850 °C (-328 °F to +1562 °F)
• Communication Protocols: 4–20 mA / HART, Modbus RS485
• Advanced Diagnostics: Includes Plugged Impulse Line Detection (PILD) for predictive maintenance
• Hazardous Area Certifications: ATEX, IECEx, SIL2/SIL3 compliance for safety-critical applications

Functional Benefits:

• Compensated Flow & Level Calculations: Real-time adjustments for pressure and temperature variations
• Reduced Installation Costs: One device replaces multiple transmitters, minimizing wiring and accessory needs
• Through-The-Glass (TTG) Configuration: Enables setup without opening the housing, even in explosive environments
• Long-Term Stability: Up to 10 years with minimal drift
• Rugged Design: Diaflex™ diaphragm and H-Shield™ coating resist abrasion and hydrogen permeation

Applications:

• Mass flow measurement for steam, gas, and liquids
• Level monitoring in open and closed tanks
• Drum water level in boilers
• Flow measurement using orifice plates, Venturi tubes, nozzles, and wedge elements