Siemens 7ME6920-1AA10-1AA0 SITRANS F M Electromagnetic Flow Transmitter
The Siemens 7ME6920-1AA10-1AA0 is a component of the SITRANS F M series, specifically an electromagnetic flow transmitter intended for use with MAG 5100W and MAG 8000 sensors. It is engineered for accurate volumetric flow measurement of conductive liquids in water, wastewater, and industrial process applications.
Measurement Principle and Performance
Based on Faraday’s law of electromagnetic induction, the transmitter creates a magnetic field and measures the voltage induced by conductive fluid flow. This principle yields unobstructed flow path, no pressure drop, and independence from fluid density, viscosity, and temperature. The 7ME6920-1AA10-1AA0 achieves accuracy of ±0.4% of flow rate (with proper calibration) and repeatability of ±0.1%. It measures flow velocities from 0.01 to 15 m/s, accommodating both low and high flow conditions.
The transmitter supports line sizes from 15 mm to 2000 mm (½ to 80 inches) when paired with appropriate sensors. It delivers robust signal processing with auto-zeroing, digital filtering, and electrode cleanliness monitoring. The unit provides a wide measuring range of 1000:1 turndown, suitable for variable process demands.
Outputs and Communication
The 7ME6920-1AA10-1AA0 features standard outputs: two configurable current outputs (active/passive 0/4-20 mA), one digital output (pulse/frequency/status), and one digital input. For communication, it supports HART protocol over the 4-20 mA loop, enabling remote configuration and diagnostics. Optional modules add PROFIBUS PA or Modbus RTU. The transmitter complies with NAMUR NE 43 for fault signaling.
Local operation is via a backlit LCD display with four push buttons, showing flow rate, totalizer, and diagnostics. The display rotates 90° for mounting flexibility. An infrared interface allows non-intrusive programming with the optional SIMATIC PDM software.
Construction and Environmental Protection
Housed in a robust aluminum or polycarbonate enclosure (model dependent), the 7ME6920-1AA10-1AA0 provides IP66/NEMA 4X and IP67/NEMA 6 rating, protecting against submersion and hose-directed water. It operates at ambient temperature of -20 to 60°C (-4 to 140°F). The transmitter is corrosion-resistant, suitable for outdoor or washdown environments. Power supply is 115-230V AC or 24V DC, with low power consumption.
The sensor connection utilizes a shielded cable up to 200 meters. The transmitter offers diagnostic features like empty pipe detection, electrode coating alert, and conductivity monitoring. It meets drinking water approvals (NSF/ANSI 61, ACS, DVGW) for potable water applications.
Applications
Common applications include water treatment plants, distribution networks, irrigation, industrial effluent monitoring, chemical dosing, pulp and paper, and mining slurry flow. The electromagnetic principle works with liquids having conductivity ≥20 µS/cm. The 7ME6920-1AA10-1AA0 is also used in energy management for thermal or cooling water circuits.
Configuration is straightforward with quick setup wizard, and calibration data is stored in the sensor’s memory (if using MAG 5100W). Remote monitoring via SCADA is seamless with HART communication. The transmitter’s long-term stability reduces maintenance costs.
