GE DS3800NHVL

Key Technical Parameters

Advantages and Distinctive Features

• Dual Temperature Sensor Support (T/C + RTD): 8 thermocouple + 8 RTD inputs (16 total channels) for mixed sensor types or redundant monitoring.

• 24-Bit Ultra-High Precision ADC: ±0.5°C for thermocouples, ±0.3°C for RTDs—the highest accuracy in the Mark V high-voltage lineup.

• Predictive Relay Maintenance: Real-time contact resistance monitoring with relay degradation warning—critical for high-voltage DC applications.

• Hybrid Output + Tachometer Feedback: Combines 8 high-voltage DC relay outputs, 4 high-current solid-state outputs, AND 2 tachometer inputs.

• Higher Solid-State Current (3A): Supports larger 48VDC auxiliary fans.

• Higher Relay Current (2A @ 125VDC): Supports more powerful 110–125VDC fans.

• RTD Fault Detection: Continuous monitoring for open-circuit, short-circuit, or lead-wire degradation.

• Extended Environmental Tolerance: -40°C to +75°C with 5g vibration resistance.

• 500-Event Fault Log: Comprehensive diagnostics.

Typical Application Fields

• Safety-Critical 125VDC Cooling Systems: Where redundant temperature sensing and fan failure detection are mandatory.

• Offshore Oil & Gas Platforms: Extreme temperature and vibration environments.

• Nuclear Auxiliary Turbines: High reliability with redundant temperature sensing and predictive maintenance.

• Military & Naval Applications: 125VDC systems with extreme environmental requirements.

• Arctic & Desert Installations: -40°C to +75°C range.

• Legacy Turbine Installations: Older systems requiring both T/C and RTD monitoring.

Comparison with Related Models

Selection Recommendations

• Choose the DS3800NHVL if:

  • You need 125VDC relay outputs with 2A current capacity and predictive maintenance.

  • You need higher-current solid-state outputs (3A @ 48VDC) for larger auxiliary fans.

  • You require both thermocouple and RTD inputs (16 total temperature channels).

  • You require RTD fault detection for sensor integrity monitoring.

  • You require tachometer feedback for fan speed verification.

  • You need ultra-precise temperature monitoring (±0.5°C / ±0.3°C).

  • Your installation is in extreme environments (-40°C to +75°C) with high vibration.

  • You need 500-event fault logging.

• Choose the DS3800NHVK if: You need the same dual-sensor capability and 3A SS outputs but operate in a climate-controlled environment and do not require predictive maintenance.

• Choose the DS3800NHVJ if: You need the same relay/SS/tachometer features but only require thermocouple inputs (no RTDs).

Critical Precautions

• ESD Protection: Always wear a grounded wrist strap. Static damage to the 24-bit ADC degrades accuracy.

• High-Voltage Hazard: Relay outputs switch 125VDC—lethal voltage present on terminals. Observe all high-voltage safety procedures. Use wiring rated for ≥125VDC.

• RTD Wiring: Use 3-wire Pt100 RTDs. All three wires must be connected. Open/short circuits trigger the yellow “RTD Fault” LED.

• RTD Lead Resistance: Use wire with resistance ≤10Ω per lead for accurate measurements.

• DC Polarity (Relay): Relay outputs are DC only—observe correct polarity.

• DC Polarity (SS): Solid-state outputs are DC-only and polarity-sensitive—reverse polarity destroys the MOSFET.

• Tachometer Wiring: Use shielded twisted-pair cable. Connect shield to designated terminal—not at the fan end.

• Relay Current Limitation: Rated at 2A continuous @ 125VDC. Verify fan current does not exceed this limit.

• SS Current Limitation: Rated at 3A continuous @ 24–48VDC. At 75°C, derate to 2.2A.

• Inductive Load Derating (Relay): Derate to 1.5A or use external RC snubbers (rated for 125VDC).

• No AC Connection: Do not connect AC loads to either output type.

• No Hot-Swap: Always depower the rack before insertion/removal.

• Slot Assignment: Install in slots 8–10 (auxiliary I/O).

• CPU Dependency: If backplane communication is lost, the board defaults to 100% fan speed—all advanced features disabled in fallback mode.

• Firmware Compatibility: The DS3800NHVL requires Mark V CPU firmware v5.0 or higher for full 24-bit ADC, predictive maintenance, and RTD support. For v4.x, the board reverts to 16-bit mode with no predictive maintenance.

• Power Supply: Draws 5.0A on +5V rail—verify sufficient capacity. A power supply upgrade may be required.