Description
Product Parameters
| Parameter | Specification |
|---|---|
| Brand / Series | GE Mark VIe Speedtronic |
| Model | IS200TREGH2B |
| Thermocouple Inputs | 20 redundant pairs (dual channels per measurement point) — upgraded from 16 pairs |
| Total Sensor Connections | 40 thermocouple inputs (configurable as redundant or independent) |
| Thermocouple Types | J, K, T, E, R, S, B (per-channel configurable via GE ToolboxST) |
| Input Range | ±100 mV |
| Cold-Junction Compensation | Dual redundant CJC sensors (accuracy ±0.3°C) |
| ADC Resolution | 24-bit delta-sigma with programmable sampling rate (2–250 SPS) |
| Accuracy | ±0.05% of reading + ±0.5°C |
| Redundancy Logic | Hardware-based comparison and voting (programmable thresholds) |
| Isolation | 2000 VAC (field-to-system) |
| CMRR | >110 dB @ 50/60 Hz |
| Diagnostics | Open-circuit detection, short-circuit detection, dual CJC fault monitoring and auto-failover, channel mismatch detection, sensor drift detection, reference validation |
| Status Indication | 20 green LEDs (primary active), 20 green LEDs (redundant active), 20 red LEDs (mismatch fault), 2 red summary fault LEDs, 1 yellow LED (reference/calibration status), 1 blue LED (CJC redundancy active) |
| Operating Temperature | –40°C to +70°C |
| Storage Temperature | –55°C to +85°C |
| Mounting | VME rack-mount terminal board with front-panel I/O connectors |
| Backplane Interface | VME64x (A24/A32, D16/D32/D64) |
| EMC Compliance | IEC 61000-4 Level 4 |
Advantages & Key Features
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Extended Redundant Capacity: 20 redundant thermocouple pairs (40 total inputs) in a single VME slot—25% more than IS200TREGH1B (16 pairs), providing the highest redundant thermocouple density in the Mark VIe family. Ideal for large turbines with extensive EGT monitoring requirements.
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Redundant Temperature Monitoring: Hardware-based comparison and voting logic ensures safe and reliable temperature monitoring.
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Dual-Redundant CJC: Two independent cold-junction sensors with automatic cross-validation and failover ensure uninterrupted measurement accuracy.
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Extended Temperature Range: –40°C to +70°C operation makes IS200TREGH2B suitable for extreme environments.
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Enhanced Isolation: 2000 VAC isolation and >110 dB CMRR provide superior protection.
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Superior Accuracy: ±0.05% reading + ±0.5°C with dual CJC sensors (±0.3°C) provides high measurement precision.
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Flexible Configuration: Channels can be configured as redundant pairs or independent single-ended inputs via GE ToolboxST.
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24-Bit Delta-Sigma Conversion: High-resolution ADC delivers stable, noise-free readings.
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Comprehensive Diagnostics: Open-circuit, short-circuit, dual CJC auto-failover, channel mismatch, sensor drift, and reference validation.
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ToolboxST Integration: Full configuration, monitoring, and diagnostics via GE ToolboxST.
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Drop-In Replacement: Direct replacement for IS200TREGH1B, IS200TREGH1A, and earlier redundant thermocouple terminal boards.
Application Fields
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Gas & Steam Turbines (GE Frame 6B/7EA/9E/HA): Exhaust gas temperature (EGT) monitoring with dual-redundant thermocouples for large turbine arrays (up to 20 EGT measurement points).
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Turbine Inlet Temperature (TIT): Redundant temperature monitoring for critical combustion control.
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Combined Cycle Plants: Redundant temperature monitoring for HRSG superheaters and reheat sections.
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Nuclear Power Plants: Critical temperature monitoring with redundancy and documented calibration.
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Aeroderivative Turbines: Redundant exhaust temperature monitoring.
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Arctic & Desert Installations: Extreme-environment critical temperature monitoring.
Comparison with Competing Products
| Feature | GE IS200TREGH2B | GE IS200TREGH1B (16 pairs) | GE IS200TREGH1A (16 pairs) | Competitor A (Redundant TC) | Competitor B (Standard TC) |
|---|---|---|---|---|---|
| Redundant Pairs | 20 (40 inputs) | 16 (32 inputs) | 16 (32 inputs) | 8 (16 inputs) | 0 |
| CJC Accuracy | ±0.3°C (dual) | ±0.3°C (dual) | ±0.5°C (single) | ±1.2°C | ±0.5°C |
| TC Accuracy | ±0.05% + ±0.5°C | ±0.05% + ±0.5°C | ±0.1% + ±1°C | ±0.2% + ±2°C | ±0.1% + ±1°C |
| Isolation | 2000 VAC | 2000 VAC | 1500 VAC | 1000 VAC | 1000 VAC |
| Operating Temp | –40°C to +70°C | –40°C to +70°C | –30°C to +65°C | 0°C to 50°C | 0°C to 50°C |
| Reference Validation | Yes | Yes | No | No | No |
| Sensor Drift Detection | Yes | Yes | No | No | No |
Key Advantage: IS200TREGH2B delivers 20 redundant thermocouple pairs—the highest channel density in the Mark VIe redundant thermocouple terminal family (25% more than IS200TREGH1B), with dual-redundant CJC (±0.3°C), extended –40°C to +70°C temperature range, 2000 VAC isolation, and comprehensive diagnostics—making it the ultimate solution for large turbine exhaust temperature monitoring applications requiring maximum channel density and reliability.
Selection Guidelines & Recommendations
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Redundancy Configuration: Determine measurement points requiring redundant thermocouples—up to 20 redundant pairs.
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Configuration Mode: Select redundant pair or independent single-ended mode per channel pair in GE ToolboxST.
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Thermocouple Type: Supports J, K, T, E, R, S, and B.
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Dual CJC Sensors: Automatic failover—blue LED indicates redundancy is active.
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Mismatch Thresholds: Program acceptable temperature difference thresholds.
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Controller Firmware: Requires Mark VIe processor firmware v9.0 or later.
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Wiring Guidelines: Use shielded thermocouple extension-grade leads with correct polarity.
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Spare Strategy: Keep one spare per turbine; lead times 8–14 weeks.
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Retrofit: Direct replacement for IS200TREGH1B and IS200TREGH1A—regenerate configuration in GE ToolboxST for 20-pair mapping.
Important Cautions
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No Hot-Swap: De-energize rack before insertion/removal.
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Thermocouple Polarity: Reverse connection produces negative readings—verify polarity.
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CJC Protection: Do not apply conformal coating or tape over terminal block area.
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Grounding: Connect AGND to Mark VIe system ground at single star point.
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Shield Termination: Thermocouple shields ground only at cabinet end.
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ESD Handling: Use grounded wrist straps; field repair not possible.
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Temperature Rating: Verify cabinet ambient does not exceed +70°C or fall below –40°C.
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Reference Validation: Yellow LED indicates reference drift—schedule factory recalibration if illuminated.
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CJC Redundancy Status: Blue LED flashing indicates one CJC sensor failed—schedule service.
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Channel Mapping: With 20 redundant pairs, verify field wiring maps to correct ToolboxST channel numbers.
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Wiring Density: With 40 thermocouple connections, ensure adequate cabinet space and cable management to maintain proper airflow.
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