GE DS200TCCBG1B

Technical Parameters

Based on the Mark V DS200 series specifications, the DS200TCCBG1B features the following key parameters:

• Primary Function: High-Density Mixed Thermocouple/RTD Input Termination Board with CJC and RTD Excitation

• Input Channels: 16 configurable thermocouple/RTD input channels (double the G1A capacity)

• Thermocouple Types Supported: J, K, T, E, S, R (configurable)

• RTD Support: Pt100 (3-wire and 4-wire)

• Cold-Junction Compensation: Onboard high-accuracy thermistor (CJC) with ±0.5°C accuracy typical

• RTD Excitation: Onboard constant current source for RTD measurements

• Input Impedance: >1 MΩ

• Terminal Type: Screw-type terminal blocks (accepts 0.5-2.5mm² wire, AWG 20-14)

• Voltage Rating: 300V AC/DC maximum

• Current Rating: 10A per terminal (maximum)

• Isolation: No active isolation (passive termination); relies on connected modules for isolation

• Form Factor: Single-slot 6U Eurocard (160mm), 96-pin DIN connector to backplane

• Mounting: Direct plug-in to Mark V rack; front-facing screw terminals for thermocouple/RTD wiring

• Operating Environment: 0°C to 60°C ambient temperature, 5% to 95% non-condensing humidity

• Labels: Clearly marked channel designations (CH1+, CH1-, etc.) with type selection guides

• Compliance: UL recognized, CE marked

Advantages and Features

The DS200TCCBG1B offers several distinctive advantages for Mark V system temperature signal termination:

1. High Channel Density with Mixed Support: The DS200TCCBG1B combines 16-channel capacity with both thermocouple and RTD support, significantly reducing board count in large-scale mixed-sensor temperature monitoring applications.

2. RTD Excitation Onboard: Integrated constant current excitation for Pt100 RTDs eliminates external excitation requirements.

3. Integrated Cold-Junction Compensation: The onboard CJC thermistor ensures accurate thermocouple temperature readings.

4. Multi-Type Support: Supports thermocouple Types J, K, T, E, S, R and Pt100 RTDs.

5. High-Density Termination: With 16 channels, the DS200TCCBG1B provides efficient termination for numerous sensors in a single slot.

6. Passive Design: Contains minimal active electronics (CJC thermistor and RTD excitation), making the DS200TCCBG1B highly reliable.

7. Hot-Swap Capable: Supports live insertion and removal with proper ESD protocols.

Application Cases in Application Fields

The DS200TCCBG1B is deployed across multiple heavy-industrial sectors:

• Combined Cycle Power Plants: A 750MW CCPP facility uses the DS200TCCBG1B to terminate both exhaust thermocouples (EGT) and bearing RTDs across multiple turbine stages, reducing board count from two G1A boards to a single G1B.

• Steam Turbine Retrofits: During a control system refurbishment, a facility installed the DS200TCCBG1B for comprehensive mixed temperature monitoring across main steam, reheat, and bearing temperature points.

• Gas Pipeline Compressor Stations: The DS200TCCBG1B terminates thermocouples for discharge temperature and RTDs for bearing temperature monitoring across multiple compressor stages.

• Offshore Oil Platforms: The high channel density and mixed-signal capability of the DS200TCCBG1B have proven valuable on offshore platforms where rack space is limited.

Comparison with Competing Products

Selection Suggestions and Precautions

Before purchasing or installing the DS200TCCBG1B:

• Verify Exact Model: Ensure the board is precisely DS200TCCBG1B, not DS200TCCBG1A or other variants. The “G1B” suffix is critical for the 16-channel high-density mixed configuration.

• Confirm Input Types: Ensure your sensors (thermocouple, RTD) match the DS200TCCBG1B capabilities.

• Channel Planning: With 16 channels, carefully plan your sensor allocation. The DS200TCCBG1B can mix thermocouple and RTD types across channels.

• RTD Wiring: For RTD measurements, use 3-wire or 4-wire configurations. Proper wiring is essential for accurate resistance measurements.

• Thermocouple Wiring: Use correct thermocouple extension wire (same type as sensor). Avoid standard copper wire for extensions.

• Polarity: Ensure correct polarity for all terminations.

• Shielding: Use shielded cables in electrically noisy environments. Connect the shield at the DS200TCCBG1B end only.

• CJC Stability: Ensure adequate airflow around the DS200TCCBG1B to maintain CJC accuracy.

• ESD Protection: Use grounded wrist straps during handling.

• Post-Installation Validation:

  • Verify all terminations are mechanically secure.

  • Confirm correct polarity and sensor type configuration for each of the 16 channels.

  • Check CJC readings against a known ambient temperature reference.

  • For RTD channels, verify excitation current and resistance readings.

  • Verify temperature readings at the HMI match expected values for all channels.

• Spare Strategy: Maintain at least one spare DS200TCCBG1B on-site.

• Supplier Qualification: Request visual inspection, CJC accuracy verification, and RTD excitation functionality testing before shipment.

Final Recommendation

For GE Mark V turbine systems requiring high-density mixed thermocouple and RTD temperature termination in a single board, the DS200TCCBG1B is the optimal solution. Its 16-channel capacity, integrated RTD excitation, multi-signal support, and onboard CJC provide efficient, accurate signal routing for comprehensive temperature monitoring applications. Prioritize reputable aftermarket suppliers offering tested units with CJC and RTD functionality verification. Maintain spares on-site, use correct wiring practices, and ensure proper polarity to guarantee the long-term reliability of your DS200TCCBG1B and the entire Mark V control system.