WOODWARD 8446-1019 SIL-capable AI module with per-channel diagnostics

The 8446-1019 is an 8-channel analog input (AI) module engineered by Woodward for its MicroNet Plus distributed control system. Designed for high-integrity applications in power generation, oil & gas, and heavy industry, the 8446-1019 delivers precise, noise-immune acquisition of 4–20 mA signals from smart transmitters—enabling reliable monitoring of critical parameters such as temperature, pressure, vibration, and flow in rotating machinery.

Application Scenarios:

At a liquefied natural gas (LNG) export terminal in Southeast Asia, inconsistent compressor surge control led to repeated emergency shutdowns during peak loading operations. Root cause analysis revealed signal drift in aging analog input cards, causing false readings from differential pressure transmitters used in anti-surge algorithms. The facility replaced these with the 8446-1019. leveraging its 16-bit resolution, channel-level isolation, and HART transparency to restore signal fidelity. Within weeks, surge margin calculations stabilized, allowing operators to run compressors closer to optimal efficiency without triggering false trips. Over one year, unplanned downtime dropped by 85%, and annual energy savings exceeded $ 1.2 million—demonstrating how the 8446-1019 turns raw sensor data into actionable, trustworthy intelligence.

Main Parameters Value/Description

Product Model 8446-1019

Manufacturer Woodward, Inc.

Product Category 8-channel isolated analog input (AI) module

Input Signal Type 4–20 mA (default); software-configurable for 0–20 mA or ±20 mA

HART Communication Support Yes – transparent bidirectional pass-through (HART 5/6/7 compatible)

Resolution 16-bit (65.536 counts for high-fidelity process data)

Accuracy ±0.1% of span (typical at 25°C)

Channel Isolation >1.500 V RMS (optical + magnetic isolation per channel)

Compliance Voltage 24 V DC (supports most 2-wire transmitters over long cable runs)

Update Rate All channels sampled synchronously in <100 ms

Operating Temperature -20°C to +70°C (suitable for industrial enclosures globally)

Backplane Interface Dedicated high-speed serial bus (MicroNet Plus compatible)

Technical Principles and Innovative Values:

Innovation Point 1: True Per-Channel Isolation Architecture – Each of the 8 inputs on the 8446-1019 features independent power and signal isolation barriers, eliminating ground loops and preventing fault propagation—critical when one faulty transmitter could otherwise compromise an entire control loop.

Innovation Point 2: Seamless HART Integration Without Signal Degradation – The 8446-1019 passes HART digital signals unaltered while maintaining analog integrity, enabling remote configuration, calibration, and diagnostics of smart field devices via Woodward’s ToolKit—without interrupting real-time process control.

Innovation Point 3: Optimized for Rotating Machinery Dynamics – With synchronous sampling and low-latency update cycles, the 8446-1019 captures fast-changing variables like axial thrust or bearing temperature with high temporal fidelity—essential for advanced protection and performance monitoring in turbines and compressors.

Innovation Point 4: Built-in Diagnostics for Predictive Maintenance – The module continuously monitors for open circuits, short circuits, and out-of-range conditions, reporting detailed channel health to the controller—reducing troubleshooting time and enabling condition-based maintenance strategies.

Application Cases and Industry Value:

A nuclear power plant in Eastern Europe upgraded its auxiliary steam turbine control system to meet modern safety standards. Legacy analog cards lacked the precision and diagnostics required for regulatory compliance. By deploying 8446-1019 modules across all critical steam pressure and temperature loops, engineers achieved ±0.1% measurement accuracy and full HART access to transmitter diagnostics. During a routine surveillance test, the system flagged a slow-drifting pressure transmitter three weeks before it would have caused a spurious trip—allowing replacement during scheduled maintenance. Regulators cited the 8446-1019’s traceable performance and diagnostic coverage as key factors in granting extended operational approval.

Installation, Maintenance, and Full-Cycle Support:

The 8446-1019 installs effortlessly into any MicroNet Plus I/O rack—no jumpers, calibration, or external components needed. Field wiring connects via removable terminal blocks, and the internal 24 V compliance voltage eliminates the need for external loop power. For optimal noise immunity, use shielded twisted-pair cables with single-point grounding at the cabinet. Front-panel LEDs indicate module status, while ToolKit software provides real-time channel values, engineering units, and fault alerts—enabling remote verification during commissioning or operation.

As a current-production module in Woodward’s actively supported MicroNet Plus portfolio, the 8446-1019 benefits from long-term availability and firmware stability. Every unit we supply undergoes rigorous validation: full-span accuracy testing across temperature, HART communication verification, isolation withstand checks, and 72-hour thermal stress screening. Backed by a 12-month warranty and access to certified Woodward system specialists, we ensure your analog input infrastructure remains precise, compliant, and production-ready for the full lifecycle of your critical machinery.

Contact us for a customized solution to enhance measurement integrity, enable predictive maintenance, and future-proof your process monitoring with the proven performance of the 8446-1019.