Yokogawa AMM21T-S2 ADMAG Series Magnetic Flow Converter

The Yokogawa AMM21T-S2, also cataloged as the AMM21T Input Module, operates as a dedicated hardware component for converting signals from magnetic flow tubes into standardized outputs within process automation networks.

Hardware Specifications

Process Control & DCS Instrumentation Properties

The device interfaces with processing nodes by transmitting primary variables through a 4-20 mA HART loop protocol or the proprietary BRAIN communication tier. To preserve common-mode rejection performance under high electrical noise thresholds, the hardware layout enforces continuous channel-to-channel isolation between the raw sensor electrode inputs and the digital system backplane bus. Signal conditioning circuits utilize dual-frequency excitation math to handle high-density slurry fluid transients, driving an internal microprocessor that calculates bidirectional flow and batching parameters with a deterministic 0.1 s response step.

Frequently Asked Questions

Q: How does the AMM21T-S2 execute parameter retention during a total loop power failure?

A: The module writes all calibration profiles, meter factors, and configuration variables directly to an onboard non-volatile EEPROM matrix. This design ensures total data persistence and eliminates the requirements for an external backup battery.

Q: What are the electrical boundary tolerances for the integrated pulse output channel?

A: The pulse output channel uses an isolated transistor contact rated for a maximum open state of 30 VDC and a maximum closed state current of 200 mA. The scalable output frequency spans a physical spectrum from 0.0001 pps up to 1000 pps.

Q: Which hardware modification or constraint does the -S2 suffix signify?

A: The -S2 suffix designates a specific electronic board build variant optimized for standard rack or panel installation, utilizing standardized field terminal linkages tailored for integration into central control architectures.

Field Installation Guidelines

• Grounding Electrode Connections: Secure the module grounding lug to an earth reference terminal block. The resistance path to earth must measure 100 Ohm or less for standard setups, and must be verified at 10 Ohm or less when deploying the hardware with the optional integrated surge arrestor function enabled.
• Cable Separation Rules: Route the excitation and signal lines linking the flow tube to the AMM21T-S2 converter using independent PVC-sheathed shielded control lines. Do not run these low-voltage lines inside conduits hosting high-voltage AC motor wires to prevent induction noise.
• Enclosure Sealing Integrity: When executing panel or pipe mounting, verify that the aluminum alloy chassis cover threads are aligned and fully engaged against the rubber perimeter seal. Tighten all cable entry glands to preserve the NEMA 4 equivalent barrier against ambient moisture.