1. Product Description

RAI-16 is a marine-grade distributed remote analog input module manufactured by Kongsberg Maritime, designed as core I/O hardware for the DC C20 vessel monitoring and alarm automation system. It provides 16 multi-type analog measurement channels to collect field sensor signals and transmit processed data to the main control network via redundant CANopen 4.0 field bus.

Core Technical Specifications: 1. Input Channels: 16 independent galvanically isolated analog channels, 16-bit high-precision A/D conversion 2. Supported Signal Types: 4–20mA, 0–20mA, 0–10V voltage, resistance signals for temperature/pressure transmitters 3. Measurement Accuracy: ±0.1% full scale, channel-to-channel isolation at 1500Vrms 4. Power Supply: 18–32 VDC nominal 24VDC, power consumption ≤7W plus sensor excitation power 5. Communication: Dual redundant CANopen bus ports for fault-tolerant marine network architecture 6. Built-in Counter: Single pulse counter supporting 5–500Hz frequency signals for flow/tachometer devices 7. Environmental Rating: Operating temperature -15°C ~ +70°C, 4G vibration resistance, IP20 enclosure, compliant with IEC 60945 & IACS E10 marine standards 8. Mounting: DIN rail or panel screw mounting, pluggable screw terminal connectors for fast wiring maintenance 9. Physical Data: Gross weight ~2.0kg, standard marine control cabinet form factor 10. Certifications: DNV, CE, IECEx marine hazardous zone certification

2. Core Product Functions

• Multi-Type Analog Signal Acquisition Each channel is independently configurable to receive current, voltage and resistance signals from temperature, pressure, level, flow and vibration transmitters onboard vessels and offshore platforms.
• On-Board Signal Scaling & Engineering Unit Conversion The module locally converts raw electrical signals into physical engineering units (°C, bar, m³/h, meters) without relying on central controller processing load.
• Redundant CANopen Bus Communication Dual CAN bus interfaces support network redundancy; if one communication cable fails, data transmission automatically switches to the backup channel to avoid monitoring loss.
• Integrated Alarm & Limit Monitoring Logic Embedded threshold checking triggers pre-configured high/low alarms for out-of-range sensor values, generates timestamped alarm events and uploads to the central alarm management system.
• High-Speed Pulse Counting Function Built-in frequency counter captures pulse signals from tachometers, flow meters and turbine speed sensors for rotational speed and volumetric flow measurement.
• Full Self-Diagnosis & Fault Detection Continuous monitoring for open-circuit, short-circuit sensor faults, excitation power overload, CAN bus communication errors and internal module hardware anomalies with dedicated LED status indicators.
• Time-Stamped Data Logging & Trend Sampling All sampled analog data carries precise time stamps for historical trend recording, supporting vessel performance tracking and marine regulatory audit reporting.
• Isolated Sensor Excitation Output Provides regulated loop power for 2-wire field transmitters, with overload protection to prevent module damage from shorted sensor wiring.

3. Typical Application Scenarios

• Ship Engine Room Monitoring Systems Measure main engine cylinder temperature, lube oil pressure, cooling water temperature, exhaust gas temperature and turbocharger vibration data.
• Cargo & Ballast Tank Level Control Analog level transmitter signal collection for fuel oil, fresh water, ballast water and chemical cargo tank inventory monitoring on cargo vessels, tankers and LNG carriers.
• Offshore Platform Process Automation Pressure, temperature and flow monitoring for drilling fluid systems, offshore crane hydraulic units and seawater treatment facilities.
• Marine HVAC & Auxiliary Machinery Control Cabin temperature, air humidity, boiler pressure and refrigeration unit analog signal acquisition for vessel climate control systems.
• Propulsion & Generator Set Monitoring Collect generator winding temperature, fuel flow, bearing pressure and rotational speed pulse signals for power plant safety supervision.
• Hazardous Zone Marine Safety Systems Gas detector analog signal input for flammable gas concentration monitoring on pump rooms and cargo holds of chemical tankers.
• Retrofit & Upgrade of Legacy Kongsberg DC C20 Systems Direct replacement module for aging analog input hardware during vessel dry-dock automation overhauls.

4. Common Faults & Troubleshooting Solutions

5. Import & Compliance Supporting Documents

1. Customs Documents: Certificate of Origin (COO), Factory Certificate of Conformity (COC), DNV Marine Type Approval Certificate, CE Declaration of Conformity 2. Safety Files: SDS/MSDS for PCB, electronic components and terminal connector materials; IEC 60945 marine environmental test report 3. Technical Data: Official Kongsberg RAI-16 datasheet, DC C20 system wiring manual, CANopen network configuration guide, spare parts maintenance manual 4. HS Code: 85372090 Marine Distributed I/O Control Module 5. Country of Origin: Norway; Gross Weight: ~2.0kg 6. Lead Time: In stock 4–7 working days; factory original order 10–14 weeks 7. Matching Spare Parts: Plug-in terminal block set, CAN bus termination resistor, shielded marine analog signal cable, module DIN rail mounting bracket, replacement excitation power fuse