GE DS200TCCBG2A

Technical Parameters

Based on the Mark V DS200 series specifications, the DS200TCCBG2A features the following key parameters:

• Primary Function: Mixed Thermocouple/RTD Input Termination Board with Enhanced CJC (Second Generation)

• Input Channels: 8 configurable thermocouple/RTD input channels

• Thermocouple Types Supported: J, K, T, E, S, R, B (enhanced over G1 series)

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

• Cold-Junction Compensation: Onboard high-accuracy thermistor with ±0.4°C accuracy typical (improved over G1 ±0.5°C)

• RTD Excitation: Precision 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: -10°C to 65°C ambient temperature (extended range), 5% to 95% non-condensing humidity

• Labels: Enhanced labeling with clearly marked channel designations and type selection guides

• Compliance: UL recognized, CE marked, RoHS compliant

Advantages and Features

The DS200TCCBG2A offers several distinctive advantages for Mark V system temperature signal termination:

1. Enhanced Cold-Junction Compensation: With ±0.4°C CJC accuracy (improved over G1’s ±0.5°C), the DS200TCCBG2A provides superior temperature measurement precision.

2. Extended Temperature Range: Rated for -10°C to 65°C, suitable for installations in extreme environments.

3. Mixed Thermocouple/RTD Support: The DS200TCCBG2A accepts both thermocouple and RTD sensors in a single board, eliminating the need for separate termination boards.

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

5. Second-Generation Design: Improved component selection for enhanced long-term stability and reliability.

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

7. Passive Design: Contains minimal active electronics (CJC thermistor and RTD excitation), making the DS200TCCBG2A highly reliable.

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

Application Cases in Application Fields

The DS200TCCBG2A is deployed across multiple heavy-industrial sectors:

• Combined Cycle Power Plants: A 750MW CCPP facility uses the DS200TCCBG2A for critical mixed temperature monitoring—exhaust thermocouples (EGT) and bearing RTDs. The ±0.4°C CJC accuracy improved measurement precision for turbine efficiency calculations.

• Gas Turbine Test Cells: The DS200TCCBG2A provides high-accuracy thermocouple and RTD termination for performance validation testing.

• Steam Turbine Retrofits: A facility installed the DS200TCCBG2A for mixed temperature monitoring across main steam and bearing temperature points.

• Offshore Oil Platforms: The extended temperature range and enhanced accuracy of the DS200TCCBG2A have proven valuable in offshore environments.

Comparison with Competing Products

Selection Suggestions and Precautions

Before purchasing or installing the DS200TCCBG2A:

• Verify Exact Model: Ensure the board is precisely DS200TCCBG2A, not DS200TCCBG1A or other variants. The “G2A” suffix is critical for enhanced CJC accuracy, extended temperature range, and Type B support.

• Environmental Assessment: If your installation experiences temperatures outside 0-60°C, the DS200TCCBG2A is the recommended choice.

• Confirm Input Types: Ensure your sensors (thermocouple, RTD) match the DS200TCCBG2A capabilities.

• 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 DS200TCCBG2A end only.

• CJC Stability: Ensure adequate airflow around the DS200TCCBG2A to maintain ±0.4°C 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.

  • 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.

• Spare Strategy: Maintain at least one spare DS200TCCBG2A on-site.

• Supplier Qualification: Request visual inspection and CJC accuracy verification (±0.4°C) before shipment.

Final Recommendation

For GE Mark V turbine systems requiring mixed thermocouple and RTD temperature termination with enhanced CJC accuracy and extended temperature range, the DS200TCCBG2A is the optimal solution. Its ±0.4°C CJC accuracy, -10°C to 65°C operating range, and integrated RTD excitation provide superior measurement reliability for critical temperature monitoring applications. Prioritize reputable aftermarket suppliers offering tested units with CJC accuracy verification. Maintain spares on-site, use correct wiring practices, and ensure proper polarity to guarantee the long-term reliability of your DS200TCCBG2A and the entire Mark V control system.