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Key Technical Specifications
| Parameter | Specification |
| Manufacturer | Metso Automation / Valmet / Neles |
| Part Number | A413125 (AIU-8) |
| Module Type | 8-Channel Analog Input Module |
| Input Ranges | 0 to 24 V, −24 to 0 V, or 0 to 24 mA |
| Sensor Support | IEPE Vibration Sensors (4 mA constant current)
Eddy Current Proximity Probes (−24 V supply, max 30 mA) Magnetic/Inductive Pulse Sensors (24 V supply, max 30 mA) Standard 4–20 mA Loop & Voltage Transducers |
| System Compatibility | Metso / Valmet Industrial Automation Backplanes |
| Operating Temperature | 0 to +60 °C (Standard Industrial) |
| Weight | Approx. 0.4 kg (0.88 lbs) |
| Dimensions | 10.3 x 7.5 x 4.7 cm |
Product Introduction & Supply Chain Strategy
The Metso/Valmet A413125 (AIU-8) is an 8-channel analog input module designed for process control and condition monitoring in heavy industrial environments. Built to integrate with Metso and Valmet automation platforms, it converts field sensor data—such as 4–20 mA process loops, voltage signals, IEPE accelerometers, and eddy-current proximity probes—into digital signals for the central processor.
From a supply chain perspective, holding the A413125 as New Surplus is a critical risk-mitigation strategy for facilities running legacy or long-life automation lines. Refurbished or pull-off I/O cards often suffer from analog component drift, aged filtering capacitors, and worn connector contacts. This can result in measurement errors or false system trips. Sourcing New Surplus units preserves system measurement accuracy, reduces total cost of ownership (TCO), and protects plants against multi-day downtime caused by lead-time delays.
A413125
A413125
Installation & Configuration Guide
1.Stage 1: Pre-Installation (Safety & Prep):Perform safety locks, de-energize rack, and wear ESD strap.
Notify system operators before removing or replacing I/O modules. Halt active control loops associated with the module channels. Fully de-energize the target rack slot or card cage following standard Lock-Out/Tag-Out (LOTO) procedures. Put on a grounded ESD wrist strap before handling the card. Record existing field terminal wiring and channel jumper settings.
2.Stage 2: Module Removal:Unfasten mounting screws and slide module out.
Unscrew the retaining screws securing the faceplate to the rack frame. Carefully disengage the module from its backplane edge connector and pull it straight out along the guide tracks. Immediately place the removed module into an anti-static shielding bag.
3.Stage 3: Physical Installation:Align card edges and seat firmly into backplane.
Align the new Metso A413125 module with the card guide rails of the designated rack slot. Push the module in smoothly until the rear edge contacts firmly engage with the backplane connector. Tighten the front panel screws to secure the unit. Reconnect field terminal blocks.
4.Stage 4: Power-On & Loop Verification:Apply power, check status LEDs, and verify software scaling.
Re-energize the rack and observe the front-panel status indicators. Confirm that the power and status LEDs display healthy operational states without fault codes. Access the system software to confirm channel configuration (4–20 mA, IEPE, or voltage mode) and verify live signal readings against a calibrated signal source.
Configuration & Operational Notes
- Software Channel Assignment: Channel parameters (input ranges, sensor power supply selection, and digital filtering) are software-configurable through the Metso/Valmet engineering suite.
- Sensor Supply Isolation: Ensure that sensor power requirements (e.g., 24 V supply for pulse sensors vs. 4 mA constant current for IEPE sensors) match software channel definitions to prevent damage to sensitive field transducers.
- Power De-energization: Always ensure slot power is isolated before physically inserting or removing the card to prevent ESD damage or backplane contact degradation.
Frequently Asked Questions (FAQ)
Q: Why is this module listed under Metso, Valmet, and Neles brands?
A: Metso, Valmet, and Neles share a long history of corporate evolution and mergers within the process automation sector. The part number A413125 (AIU-8) refers to the same 8-channel analog input module across these legacy and current product lines.
Q: What type of sensors can be wired directly to the A413125 AIU-8 card?
A: The AIU-8 module supports standard 4–20 mA loops, 0–24 V / −24–0 V DC signals, IEPE accelerometers/vibration transducers, magnetic/inductive pulse sensors, and eddy-current proximity probes.
Q: Why choose New Surplus over a refurbished module?
A: Analog input cards process sensitive low-voltage signals. Refurbished modules often carry component degradation that causes calibration drift over time. New Surplus offers factory-level signal precision and long-term reliability without direct OEM lead times.
Q: What documentation and warranty come with the unit?
A: All New Surplus modules ship in ESD shielding packaging with verifiable OEM serial numbers and are backed by a standard 1-year replacement warranty.
