Description
DS3800NTBJ1B1A: Product Overview
The DS3800NTBJ1B1A is a daughterboard-grade low-level interface card that plugs onto a motherboard carrier inside the Mark IV rack. It samples millivolt-level signals from thermocouples, RTDs, pressure transducers, and vibration probes, amplifies them to ±10 V or 0–10 V, and routes the conditioned signals to Mark IV ADC or CPU cards over the VME back-plane. The card is hardware-configured (no firmware) and deterministic, making it suitable for safety-related process monitoring when triple-redundant.
Physical implementation includes precision instrumentation amplifiers, blue jumper blocks for gain/offset, galvanic isolation, and TVS surge suppressors. 20-pin ribbon carries differential inputs and conditioned outputs; keyed and gold-plated to prevent mis-insertion or fretting corrosion under decades of thermal cycling.
Environmental qualification meets –20 °C to +70 °C, IEEE 344 form-factor, and CE emissions, giving >25-year service life in baseload duty.
DS3800HMPK1N1K
DS3800NTBJ1B1A: Technical Specifications
-
Model Number: DS3800NTBJ1B1A
-
Manufacturer: General Electric (GE Energy)
-
Product Type: Low-Level Interface / Signal Conditioning Board
-
System Compatibility: Speedtronic Mark IV (6BA06 slot)
-
Input Range: ±50 mV to ±10 V, 0–10 V, 4–20 mA (jumper-selectable)
-
Output Range: ±10 V or 0–10 V (jumper-selectable)
-
Gain/Offset: Blue jumper blocks, ±0.1 % accuracy @ 25 °C
-
Isolation: 1500 V AC channel-to-ground, 500 V channel-to-channel
-
Connectors: 20-pin ribbon, keyed, gold-plated
-
Power Rails: +5 V logic, ±15 V analog, <0.5 W per channel
-
LEDs: Green = channel active, Red = over-range / open circuit
-
Temp Range: -20 °C to +70 °C operational, -40 °C to +85 °C storage
-
Certifications: CE, RoHS, Mark IV form-factor compatible
Core Features & Customer Value
Microvolt-Level Resolution for Critical Measurements
50 µV resolution and <0.1 % gain accuracy enable precise temperature, pressure, and vibration monitoring—essential for bearing-metal temperature, combustor pressure, and shaft vibration trending without external transmitters.
50 µV resolution and <0.1 % gain accuracy enable precise temperature, pressure, and vibration monitoring—essential for bearing-metal temperature, combustor pressure, and shaft vibration trending without external transmitters.
Hot-Swappable in TMR Strings
Redundant Mark IV allows online replacement of one interface card; remaining two legs continue voting. MTTR is <5 min—no outage, no load shed, no restart required.
Redundant Mark IV allows online replacement of one interface card; remaining two legs continue voting. MTTR is <5 min—no outage, no load shed, no restart required.
Field-Configurable Without Software
Blue jumper blocks select gain, offset, and input range—technician can adapt to different sensor types (thermocouple, RTD, strain gauge) using only a tweaker and a DMM, no laptop required.
Blue jumper blocks select gain, offset, and input range—technician can adapt to different sensor types (thermocouple, RTD, strain gauge) using only a tweaker and a DMM, no laptop required.
Surge-Hardened for Turbine Deck
TVS diodes and opto-isolators clamp >500 V spikes from lightning, VFD switching, or exciter flash-over. 1500 V isolation prevents ground-fault propagation to CPU cards, reducing unplanned replacement by >60 % compared with non-isolated interface cards.
TVS diodes and opto-isolators clamp >500 V spikes from lightning, VFD switching, or exciter flash-over. 1500 V isolation prevents ground-fault propagation to CPU cards, reducing unplanned replacement by >60 % compared with non-isolated interface cards.
DS3800HMPK1N1K
Typical Applications
Gas Turbine Bearing & Combustor Monitoring
Primary low-level interface for Frame 7/9 heavy-duty units: measures bearing-metal thermocouples and combustor pressure transducers, outputs ±10 V to Mark IV ADC, enabling thermal protection and predictive maintenance alarms.
Primary low-level interface for Frame 7/9 heavy-duty units: measures bearing-metal thermocouples and combustor pressure transducers, outputs ±10 V to Mark IV ADC, enabling thermal protection and predictive maintenance alarms.
Steam Turbine Vibration & Eccentricity
4-wire strain-gauge inputs on generator bearings and steam-pipe pressure cells—compensated accuracy prevents false vibration trips during load ramps or start-ups.
4-wire strain-gauge inputs on generator bearings and steam-pipe pressure cells—compensated accuracy prevents false vibration trips during load ramps or start-ups.
Remote Site & Island Mode Operation
Long-cable thermocouple runs (up to 500 m) from offshore compressor skids are automatically compensated, eliminating need for local transmitters and reducing cable count by 40 % .
Long-cable thermocouple runs (up to 500 m) from offshore compressor skids are automatically compensated, eliminating need for local transmitters and reducing cable count by 40 % .
