Yokogawa AMM11 Magnetic Flow Converter

The Yokogawa AMM11, also cataloged as the AMM11 Magnetic Flow Converter, operates as a dedicated hardware component for accurate and reliable measurement of conductive liquids within process automation platforms.

Hardware Specifications

Process Control Integration and DCS Instrument Features

• Dual Frequency Excitation Framework: The device features an integrated excitation technique that applies high-frequency sampling to eliminate low-frequency slurry noise while simultaneously maintaining zero-point stability under dynamic flow conditions.
• 4-20 mA HART Loop Protocol Pass-Through: The circuit design allows digital communication signals from BRAIN or HART protocols to be superimposed directly onto the 4-20 mA analog output line without causing attenuation or loop impedance interference.
• Integrated Surge Protection: Internal surge arrestors are built directly into the terminal block arrays for the power supply, excitation circuit, analog outputs, pulse output, and status inputs to isolate the processing core from field transients.

Frequently Asked Questions

Q: Does the AMM11 require a backup battery to maintain parameters during a sudden loss of system power?

A: No. The converter stores all configuration parameters, totalizer volumes, and span settings inside an integrated non-volatile EEPROM storage architecture, eliminating the need for battery maintenance.

Q: What are the primary electrical isolation metrics between the power loop and the grounding path?

A: The internal insulation resistance measures at 100 MOhm minimum when tested at 500 V DC between the primary power terminals and the chassis ground terminal. It features a dielectric withstand voltage rating of 1500 V AC for 1 minute.

Field Installation Guidelines

• Shield Grounding Execution: Terminate all dedicated flowtube signal and excitation cabling within the terminal compartment using ISO M4 screw connections. Connect the converter grounding terminal to a high-integrity clean ground point with a total ground resistance value of 100 Ohm or less (10 Ohm or less when leveraging the internal surge arrestors).
• Signal Cable Separation Boundaries: Enclose and route the incoming flow signals and communication cabling through approved conduit entries (ANSI 1/2 NPT, ISO M20 x 1.5, or DIN Pg13.5 options). Keep a minimum physical clearance distance of 15 cm (0.6 ft) between the field signal wires and any high-voltage AC electrical power distribution lines.
• Convection and Environmental Sealing: Verify the enclosure door is tightly clamped to maintain its NEMA 4X / IP67 equivalent environmental protection rating. Ensure the mounting location does not experience ambient temperatures outside the -10 to 60 deg C operational threshold.