Description
Product Parameters
| Parameter | Specification |
|---|---|
| Brand / Series | GE Mark VIe Speedtronic |
| Model | IS200TRESH1A |
| Total Channels | 16 mixed inputs (configurable per channel) |
| RTD Inputs | Up to 16 channels (Pt100, Ni120, 3-wire or 4-wire) |
| Thermocouple Inputs | Up to 16 channels (J, K, T, E, R, S, B) |
| RTD Range | 0–400 Ω (Pt100: –200°C to +850°C; Ni120: –60°C to +250°C) |
| Thermocouple Range | ±100 mV |
| RTD Excitation | Programmable 0.5/1.0/2.0 mA |
| Cold-Junction Compensation | Built-in CJC sensor (accuracy ±0.5°C) |
| ADC Resolution | 24-bit delta-sigma with programmable sampling rate (4–200 SPS) |
| Accuracy (RTD) | ±0.1% of reading + ±0.3°C |
| Accuracy (TC) | ±0.1% of reading + ±1°C |
| Lead-Wire Compensation | Automatic (3-wire and 4-wire RTD) |
| Isolation | 1500 VAC (field-to-system) |
| CMRR | >100 dB @ 50/60 Hz |
| Diagnostics | Open-circuit detection, short-circuit detection, lead-wire imbalance monitoring, CJC fault monitoring |
| Status Indication | 16 green LEDs (channel active), 2 red LEDs (diagnostic fault summary) |
| Operating Temperature | –30°C to +65°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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Mixed Input Flexibility: IS200TRESH1A combines RTD and thermocouple inputs on a single board, eliminating the need for separate terminal boards for different temperature sensor types.
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Configurable Channel Allocation: Each channel can be independently configured as RTD or thermocouple via GE ToolboxST, matching specific application requirements.
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High Channel Density: 16 mixed inputs in a single VME slot—double the density of competing modules.
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Programmable RTD Excitation: Selectable 0.5/1.0/2.0 mA to optimize for sensor self-heating and cable length.
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High-Precision CJC: Built-in CJC sensor with automatic compensation ensures thermocouple measurement accuracy.
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24-Bit Delta-Sigma Conversion: High-resolution ADC delivers stable, noise-free readings.
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Automatic Lead-Wire Compensation: For 3-wire and 4-wire RTDs, eliminating lead-wire resistance errors.
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Comprehensive Diagnostics: Open-circuit, short-circuit, lead-wire imbalance, and CJC fault detection per channel.
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ToolboxST Integration: Full configuration, calibration, and diagnostics via GE ToolboxST.
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Drop-In Replacement: Direct replacement for earlier GE mixed temperature input terminal boards.
Application Fields
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Gas & Steam Turbines (GE Frame 6B/7EA/9E/HA): Bearing temperature (RTD) combined with exhaust gas temperature (thermocouple) monitoring.
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Combined Cycle Plants: Feedwater temperature (RTD) plus HRSG superheater temperature (thermocouple).
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Compressor Stations: Bearing temperature (RTD) plus discharge temperature (thermocouple).
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Aeroderivative Turbines: Oil temperature (RTD) plus exhaust temperature (thermocouple).
Comparison with Competing Products
| Feature | GE IS200TRESH1A | Competitor A (Mixed Temp Module) | Competitor B (Separate RTD + TC) |
|---|---|---|---|
| Total Inputs | 16 mixed | 8 mixed | 16 (8 RTD + 8 TC) |
| RTD Types | Pt100, Ni120 | Pt100 only | Pt100, Ni120 |
| Thermocouple Types | J, K, T, E, R, S, B | J, K, T | J, K, T, E, R, S, B |
| CJC Accuracy | ±0.5°C | ±1.2°C | ±0.5°C |
| RTD Accuracy | ±0.1% + ±0.3°C | ±0.2% + ±0.5°C | ±0.1% + ±0.3°C |
| Isolation | 1500 VAC | 1000 VAC | 1500 VAC |
| Operating Temp | –30°C to +65°C | 0°C to 50°C | –30°C to +65°C |
Key Advantage: IS200TRESH1A provides 16 mixed RTD/thermocouple inputs—double the density of competing mixed modules—with flexible per-channel configuration, high precision, and comprehensive diagnostics, making it ideal for turbine applications requiring both RTD and thermocouple monitoring.
Selection Guidelines & Recommendations
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Channel Configuration: Determine required mix of RTD and thermocouple inputs—configure each channel in GE ToolboxST.
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RTD Type: Select Pt100 or Ni120 per channel.
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RTD Excitation: Use 0.5 mA for small sensors (minimize self-heating) or 2.0 mA for long cable runs.
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RTD Wiring: Configure 3-wire or 4-wire per channel.
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Thermocouple Type: Select J, K, T, E, R, S, or B per channel.
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CJC Sensor Placement: Maintain adequate airflow around the CJC sensor on the terminal block.
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Controller Firmware: Requires Mark VIe processor firmware v7.5 or later.
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Wiring Guidelines: Use shielded twisted-pair cables for RTDs and shielded extension-grade leads for thermocouples.
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Spare Strategy: Keep one spare per turbine; lead times 6–10 weeks.
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Retrofit: Direct replacement—regenerate configuration in GE ToolboxST.
Important Cautions
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No Hot-Swap: De-energize rack before insertion/removal.
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RTD Polarity: For 3-wire RTDs, ensure leads are correctly connected.
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Thermocouple Polarity: Reverse connection produces negative readings.
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CJC Protection: Do not apply conformal coating or tape over the 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: Ground shields only at cabinet end.
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ESD Handling: Use grounded wrist straps; field repair not possible.
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Lead-Wire Imbalance: Monitor imbalance alerts—investigate wiring mismatches.
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Channel Mapping: With 16 mixed channels, verify field wiring maps to correct ToolboxST assignments.
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