Description
Lyngso Marine AEM402 | Analog Input Module
Dynamic Project Introduction
Marine automation and alarm monitoring networks demand robust, highly accurate signal processing units to oversee critical propulsion, auxiliary, and tank-level parameters. The Lyngso Marine AEM402 analog input module fulfills this role, providing 8 differential input channels capable of scaling voltage, current loops, and resistance-based temperature sensors (such as Pt100 elements) directly within engine control spaces.
When legacy marine automation hardware experiences sensor interface faults or component drift, sourcing exact-match replacement modules is vital to restoring seamless bridge and engine room monitoring without costly control-software rewrites or custom rewiring.
AEM402
Key Technical Specifications
| Parameter | Specification Detail |
| Primary Architecture | Marine Analog Input / Interface Expansion Module |
| System Compatibility | Lyngso Marine / STN Atlas / SAM Electronics Engine Control & Alarm Systems |
| Input Channels | 8 differential inputs total (\pm 10V or \pm 20mA / 4-20mA ranges) |
| Specialized Inputs | 4 out of the 8 channels also support resistance measurement (Pt100 / Ni100 / 0-2k range) |
| A/D Conversion | 12-bit analog-to-digital converter (achieving 10-bit effective accuracy at gain steps 1 to 256) |
| Module Dimensions | Approx. 125.4 \times 216 \times 58 mm (D \times W \times H) |
| Mounting Format | DIN European standard support rails |
| Marine Type Approvals | ABS, DNV, GL, LR, RINA, KR, MRS (Classification Society Certified) |
Global Sourcing & Live-Test SOP
Sourcing discontinued marine automation cards requires rigorous multi-point testing to guarantee signal accuracy, analog conversion stability, and communication bus reliability:
- Inbound Verification: Part numbers, OEM stamps, and part identifier tags (such as Lyngsø PN
962.004.200or STN Atlas271.138.714) are audited against genuine factory records. - Visual Audit: Printed circuit boards are examined under magnification for moisture ingress, salt residue, electrolytic capacitor degradation, and backplane pin corrosion.
- Live Bench Simulation: Units are connected to an active marine test rig to verify internal power rails, digital bus handshakes, and multi-channel analog reading consistency.
- Diagnostics & Prep: Input channels are injected with calibrated current, voltage, and resistance reference signals to confirm linear scaling across the 12-bit A/D converter. Approved units are cleaned, anti-static bagged, and sealed in heavy-duty moisture-barrier packaging.
The Field Engineer’s Pitfall Guide
❗ Sensor Wiring and Shielding Ground Loops: Failing to properly ground signal cable shields at the designated marine cabinet earthing terminals will introduce electrical noise into the differential inputs, resulting in erratic analog readings or alarm flickering.
❗ Resistance Measurement Channel Overlaps: Only 4 of the 8 input channels support resistance/Pt100 measurement configurations. Connecting RTD sensors to voltage/current-only designated channels will cause invalid data processing or sensor fault flags.
❗ Power Supply Rail Stability: Ensure internal power supply rails (\pm 15V and +5V card supplies) are stable prior to hot-swapping or powering up the rack, as voltage sags can corrupt the module’s microprocessor initialization.
Intent-Driven FAQ
What systems use the Lyngsø Marine AEM402 module?
The AEM402 is utilized primarily within Lyngsø Marine and STN Atlas (SAM Electronics) engine control, alarm, and monitoring systems for handling multi-type shipboard sensor inputs.
Can this module process Pt100 temperature sensors?
Yes. Out of the 8 differential input channels, 4 channels feature built-in capability to measure resistance and process Pt100 or Ni100 temperature elements alongside standard voltage and current loops.
What is the primary part number for ordering replacements?
The standard Lyngsø Marine part number is 962.004.200. It is also cross-referenced under STN Atlas / SAM Electronics part number 271.138.714.
What causes an analog channel to float or show erratic readings?
Erratic readings typically stem from a loose terminal block screw, degraded cable shielding, an open-circuit sensor line, or an uncalibrated offset configuration in the monitoring software node.
What warranty covers surplus AEM402 units?
Every unit delivered from our inventory is backed by a comprehensive 12-month operational warranty covering A/D conversion accuracy, component health, and power regulation stability.
