Description
Product Introduction
The Metso AI8H (part number D201189) is an 8-channel high-density analog input module designed for the Metso DNA (formerly maxDNA) Distributed Control System. Built specifically for process-critical industries, it interfaces continuous analog field transmitters—such as flowmeters, pressure transmitters, level sensors, and temperature transmitters—directly to the DCS I/O bus.
In addition to processing standard 4–20 mA signals, the AI8H natively supports HART bidirectional digital communication across all 8 channels. This enables process operators and instrument technicians to pass online HART diagnostic data, device configuration parameters, and secondary variable measurements directly from smart field devices to central asset management software without adding secondary field multiplexers or external wiring loops.
Key Technical Specifications
| Parameter | Value |
| System Compatibility | Metso DNA / maxDNA DCS I/O Architecture |
| Number of Channels | 8 Differential Analog Channels |
| Input Signal Range | 4–20 mA DC (supports 0–20 mA scaled ranges) |
| HART Support | HART Protocol v5/v6/v7 pass-through on all 8 channels |
| A/D Conversion Resolution | 16-bit Sigma-Delta converter |
| Accuracy | \le \pm 0.1\% of full scale at 25^\circC |
| Channel-to-Bus Isolation | 500V AC optical isolation |
| Power Supply Requirements | 24V DC field transmitter power / internal backplane bus power |
| Power Consumption | Approx. 3.5 W under full 8-channel load |
| Operating Temperature | 0^\circC to +60^\circC (32^\circF to 140^\circF) |
Application Scenarios & The “Trench” Experience
In pulp and paper mills, power generation plants, and mineral processing facilities, analog loop accuracy is non-negotiable. If an analog input card experiences A/D drift or electrical noise interference, critical boiler drum levels or digester pressure loops can become unstable, forcing manual operator overrides or emergency plant trips.
The AI8H D201189 is engineered with channel filtering and optical isolation to withstand heavy ground loops and high electrical noise typical of heavy manufacturing environments. Its HART capability provides immediate value in maintenance turnarounds: if a smart pressure transmitter suffers sensor degradation, the HART diagnostic layer alerts maintenance personnel on the DCS console before the loop fails completely, preventing unscheduled downtime.
- Pulp & Paper Manufacturing – Monitoring liquor flow, stock consistency, and headbox pressure loops.
- Power & Thermal Utilities – Managing feed water flow, steam drum level transmitters, and condenser pressure loops.
- Mining & Mineral Processing – Slurry flow measurement and tank level tracking in harsh processing environments.
- Chemical & Petrochemical Processing – Interfacing precision multi-variable HART transmitters across hazardous plant areas.
AI8H D201189
AI8H D201189
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Metso DCS I/O test racks. Every surplus or refurbished AI8H D201189 module undergoes a strict 5-stage verification process before shipping:
- Inbound Physical Audit: Full visual check of backplane edge connectors, side locking clips, surface-mount components, and circuit board cleanliness.
- Backplane Power-Up & Heartbeat Test: Module inserted into an active Metso DNA I/O unit; verified DC rail voltages, module initialization, and system communication LED indicators.
- 8-Channel Precision Signal Loop Calibration: Injected calibrated 4 mA, 12 mA, and 20 mA signals across all 8 channels simultaneously using precision loop calibrators; verified 16-bit A/D conversion accuracy within \pm 0.1\% limits.
- HART Pass-Through Handshake Verification: Connected a HART-enabled smart transmitter to each port; confirmed bidirectional HART command pass-through and device parameter polling via diagnostic software.
- Memory Clear & ESD Packaging: Node address parameters reset, terminal contacts inspected, and unit sealed in anti-static ESD shielding packaging.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Distinguish Between AI8 and AI8H: The standard Metso AI8 module processes 4–20 mA signals only, whereas the AI8H (D201189) includes the HART modem layer. Replacing an AI8H card with a non-HART AI8 card will cause HART asset management communications to fail, throwing device fault alarms across your DCS screens.
❗ Observe External 24V DC Transmitter Power Wiring: Depending on whether your field instruments are 2-wire loop-powered or 4-wire self-powered transmitters, ensure the terminal unit wiring matches the required power sourcing scheme. Applying external 24V DC to a channel configured for self-powered inputs can damage input channel sense resistors.
⚠️ Shielding & Grounding Integrity: HART signals ride as high-frequency AC FSK signals on top of the 4–20 mA current loop. Improperly grounded cable shields or unshielded twisted pairs in high-vibration motor control center (MCC) cable trays will distort the HART frequency waveform, causing intermittent HART dropped-packet alarms.
❗ Match Node Firmware & Software Revisions: Ensure the Metso DNA system software version running on your controller/engineering server supports the specific hardware revision tag on the D201189 module to avoid hardware definition mismatches during station boot.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the Metso AI8H D201189 hot-swappable in a live Metso DNA system?
A: Yes. The AI8H module can be replaced online while the rest of the DCS I/O rack remains powered and active, minimizing process downtime during module replacement.
Q: Can this module accept 2-wire and 4-wire analog transmitters?
A: Yes. The AI8H supports both 2-wire loop-powered and 4-wire self-powered 4–20 mA devices when correctly wired to the matching terminal base unit.
Q: What is the difference between Valmet and Metso branding on this part?
A: Metso Process Automation was rebranded under Valmet. The part numbers (AI8H and D201189) remain identical across both brand designations and are 100% form, fit, and function interchangeable.
Q: What warranty comes with this module?
A: All our new surplus and bench-tested refurbished Metso / Valmet modules come backed by a full 12-month direct replacement warranty. If a unit fails under standard operating conditions within one year, we replace it immediately from stock.
Start Chat
