Yokogawa A2SAM105-H000 Current/Voltage Input Adaptor

The Yokogawa A2SAM105-H000, also cataloged as the A2SAM105 Current/Voltage Input Adaptor, operates as a dedicated hardware component for wide-area control network orchestration and automated I/O loop synchronization within compatible instrumentation platforms.

Hardware Specifications

Process Control Integration and DCS Instrument Features

• 4-20 mA HART Loop Protocol Routing: Featuring the -H suffix, this adapter fully supports the HART7 digital protocol, enabling bi-directional communication to extract advanced diagnostic and multivariable telemetry from field transmitters.
• Dual-Mode Input Conditioning: Supports software configuration for either 0 to 10 V DC voltage inputs or 4 to 20 mA current inputs, compatible with both 2-wire and 4-wire transmitter topologies.
• Channel-to-Channel Isolation Matrix: High-integrity physical isolation barriers rated up to 1500 V AC safeguard internal logic lines against external system-side faults and eliminate common-mode noise issues in crowded wire trays.

Frequently Asked Questions

Q: How does the input resistance of the current measurement loop behave under loss-of-power conditions?

A: During active operation, the input resistance ranges from 320 to 640 ohms depending on loop current. Upon system power-off, the circuit switches to a high-impedance state of 100 k-ohms or higher, preventing current loop disruption.

Q: Can the adapter power 2-wire field transmitters directly without external line modules?

A: Yes. The adapter provides a transmitter power supply of at least 15.0 V DC (at 20 mA) up to a maximum of 24.0 V DC. It also features a hardware current limitation of 40 mA or lower to protect against loop short-circuits.

Field Installation Guidelines

• Baseplate Alignment and Seating: Mount the unit firmly into its allocated slot on the A2BN3D baseplate. Ensure that the locking mechanism is fully engaged to maintain reliable backplane electrical contacts and prevent high-vibration drift.
• Signal Shielding and Drain Management: Terminate instrument cable shields directly at the designated baseplate ground terminal. Run the analog signal lines separately from high-voltage AC cables to minimize electromagnetic coupling.
• Thermal and Environmental Limits: For installations operating near the temperature extremes of -40 to 70 deg C, maintain adequate convection clearance within the cabinet enclosure to prevent accuracy drift outside the specified temperature limits.