The Endress Hauser Promag 33A T08-AD12ED11D21A is an electromagnetic flow measuring transmitter for precise measurement of conductive liquids across industrial and municipal applications. Based on Faraday’s Law of electromagnetic induction, the transmitter detects voltage induced in a conductor moving through a magnetic field, generating a signal proportional to flow velocity. Its modular mechanical and electronic construction enables board-level configuration changes and system expansion without redesign. The instrument operates on 85–260 VAC, 50–60 Hz with approximately 15 VA/W power consumption and delivers galvanically isolated 4–20 mA current and pulse/frequency outputs.
## Technical Specifications
• **Measuring Principle:** Electromagnetic induction (Faraday’s Law)
• **Minimum Conductivity:** ≥ 5 µS/cm (most liquids); ≥ 20 µS/cm (demineralised water)
• **Flow Range:** Over 1000:1 dynamic range; 0.033–33 ft/sec operating; peak handling to 41 ft/sec
• **Power Supply:** 85–260 VAC, 50–60 Hz
• **Power Consumption:** Approximately 15 VA/W
• **Output Signals:** 4–20 mA current output; pulse/frequency output
• **Empty Pipe Detection:** Integrated
• **Data Retention:** Removable DAT memory chip (EEPROM), battery-free
• **Compliance:** CE approval; EN 50081 Parts 1–2 / EN 50082 Parts 1–2; NAMUR recommendations
## Key Features
• Two-line illuminated display with three optical keypads (Touch Control) for cover-sealed operation
• Twelve selectable languages with English default startup mode
• All inputs and outputs galvanically isolated from power, measuring circuit, and each other
• Extensive system self-monitoring with error annunciation at status output
• Optional HART communication module
• Optional RS 485 communication module
• Auxiliary input for external voltage to suppress output signals (positive zero return applications)
## Typical Applications
• Acids, caustics, and chemical process fluids
• Pastes and slurries
• Potable water and wastewater
• Food and beverage processing
## Compatibility & Integration
Modular design supports HART and RS 485 communication protocols via optional modules. All signal interfaces are galvanically isolated, enabling safe integration into multi-loop control systems and networked instrumentation architectures.
