JRCS JSTD-M15A

Technical Core Specifications

1. A/D Conversion Core Parameters
   • Analog input channel quantity: 8 independent differential input channels
   • Conversion resolution: 10-bit analog-to-digital conversion
   • Single channel sampling frequency: 10 Hz synchronous multi-channel sampling
   • Input signal standard range: 0–10 V DC, 4–20 mA dual universal analog signal
2. Communication Bus Interface
   • On-board ship dedicated parallel backplane bus for rack internal data transmission
   • Galvanic isolation voltage between field signal side and bus logic circuit: 2000 Vrms
3. Power Supply Specification
   • Rated operating power supply: 24 V DC ship standard control power
   • Static power consumption: ≤3 W
4. Mechanical & Environmental Marine Grade Parameters
   • PCB overall dimension: Standard marine 3U rack plug-in card size
   • Net weight: 140 g
   • Operating temperature: −10 °C ~ +55 °C
   • Anti-vibration standard: IEC 60068-2-6 marine ship vibration test specification
   • Protection class: IP20 (install inside sealed marine control cabinet)

Functional Features

1. 8-channel independent signal conditioning circuit, each channel configurable voltage/current input mode via on-board jumpers
2. Built-in input signal overvoltage, reverse polarity and short-circuit hardware protection circuit adapting to ship power grid fluctuation
3. Multi-channel synchronous sampling without channel signal phase deviation, ensuring synchronized collection of main engine multi-point temperature signals
4. On-board channel open-circuit automatic diagnosis, front panel LED indicator light alarm when sensor wire broken
5. Marine anti-salt fog coating treatment on PCB surface to resist ship engine room salt spray corrosion
6. Plug-in hot-swap rack design allowing single card replacement without shutting down entire ship monitoring system

Working Principle

Material & Structural Composition

• PCB substrate: Marine high anti-corrosion FR4 circuit board with full surface salt fog resistant three-proof coating
• Core conversion chip: Industrial grade multi-channel 10-bit successive approximation A/D converter
• Terminal components: Tin-plated copper screw terminals with anti-rust nickel alloy spring sheets
• Mechanical frame: Thin stainless steel plug-in card fixing frame with vibration absorption rubber pad

Advantage Highlights

1. Strictly comply with international marine electrical equipment vibration and salt fog corrosion resistance standards for ocean-going ship engine room long-term operation
2. Multi-channel synchronous sampling eliminates signal time difference error of main engine multi-point temperature monitoring
3. Ultra-low power consumption reduces ship DC control power load and cabinet heat generation
4. Hot-swappable plug-in design avoids whole monitoring system shutdown for single channel fault maintenance
5. Dual 0–10 V / 4–20 mA input compatibility matches all standard marine pressure and temperature transmitters

Applicable Industries

Installation Mandatory Requirements

1. Install inside fully sealed marine control cabinet with dehumidification equipment to maintain internal relative humidity below 70%
2. All field sensor wiring use marine shielded twisted pair cable, shielding single-point grounded at cabinet ground copper bar
3. Fix plug-in card rack with vibration absorption rubber base to reduce hull navigation vibration transmission to PCB board
4. Separate analog signal wiring and high-current power wiring wiring trough inside cabinet

Operation & Maintenance Precautions

1. Every 6 months inspect PCB surface three-proof coating integrity to prevent salt fog corrosion leakage
2. Execute full channel signal calibration with marine standard signal calibrator every 12 months
3. Avoid opening cabinet ventilation window during ship ocean navigation to prevent salt fog entering card surface
4. When channel fault LED steady bright, inspect field sensor wiring first before card replacement