Description
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric |
| Model | IS200DTTCH1ABB |
| Series | Mark VI / Speedtronic™ |
| Board Type | Digital Thermocouple Input (DTTC) |
| Input Channels | 8 isolated thermocouple inputs |
| Supported Thermocouple Types | J, K, T, E, R, S, B, N (software selectable) |
| Input Range | -100°C to +1800°C (depending on type) |
| Resolution | 16-bit ADC per channel |
| Accuracy | ±0.1% of reading + CJC error (±0.5°C typical) |
| Cold Junction Compensation | Built-in per-channel CJC sensors |
| Update Rate | 50 ms per channel (faster than standard 100 ms) |
| Input Impedance | > 10 MΩ |
| Common-Mode Rejection | > 100 dB |
| Isolation | Channel-to-channel and channel-to-backplane: 1500V RMS |
| Power Requirements | +5V DC / 2.0A, ±15V DC / 0.4A |
| Operating Temperature | -30°C to +65°C |
| Suffix Meaning | “ABB” = specific firmware/configuration variant with preload |
Advantages and Key Features
Faster Dynamic Response with Factory Preload: The IS200DTTCH1ABB offers the faster 50 ms update rate of the IS200DTTCH1A combined with factory-preconfigured sensor settings, making it ideal for capturing rapid temperature transients while reducing commissioning time.
Reduced Power Consumption: With 8 channels, the IS200DTTCH1ABB consumes less power and generates less heat than 16-channel alternatives, ideal for installations with limited rack capacity or power constraints.
Comprehensive Thermocouple Support: Supports all major thermocouple types with software selection per channel, allowing flexible deployment across different temperature measurement points.
Individual Cold Junction Compensation: Each channel features dedicated CJC sensors, ensuring accurate temperature readings despite ambient temperature variations.
Full Diagnostic Capability: Features open-thermocouple detection, input range validation, CJC sensor health monitoring, and channel deviation alarms with fault reporting to the main DSP processor.
Application Fields and Case Studies
The IS200DTTCH1ABB is used in GE gas turbines for critical exhaust thermocouples requiring faster dynamic response, combustion dynamics monitoring, turbine inlet temperature sensing, and high-temperature process measurement. In a 500 MW plant, the IS200DTTCH1ABB was selected for its combined faster update rate and factory preload matching the site’s specific thermocouple calibration. The board captured rapid temperature fluctuations during load changes that slower 100 ms boards missed, enabling improved combustion tuning. The preloaded configuration reduced commissioning time by 2 days.
Comparison with Competing Products
| Dimension | IS200DTTCH1ABB | IS200DTTCH1A | IS200DTAIH1A | IS200DTCIH1A |
|---|---|---|---|---|
| Input Channels | 8 | 8 | 16 | 16 |
| Update Rate | 50 ms | 50 ms | 100 ms | 100 ms |
| CMRR | > 100 dB | > 100 dB | > 100 dB | > 120 dB |
| Pre-configured Options | Yes (ABB) | No | No | No |
| Power Consumption | Lower | Lower | Higher | Higher |
| Diagnostics | Open-TC + range + CJC | Open-TC + range + CJC | Open-TC + range + CJC | Open-TC + range + CJC + deviation |
The IS200DTTCH1ABB combines the fast update rate and low power consumption of the IS200DTTCH1A with the commissioning benefits of factory pre-configuration. It is the optimal choice when dynamic response, power efficiency, and reduced setup time are all priorities.
Selection Recommendations
Choose the IS200DTTCH1ABB when your application requires faster temperature update rates AND you want factory-preconfigured settings for reduced commissioning. Select it over the IS200DTTCH1A when the “ABB” preload matches your sensor specifications. Use it for critical exhaust thermocouples where rapid temperature transients must be captured. Choose this board over 16-channel alternatives when rack power or space is limited. Avoid the IS200DTTCH1ABB if your sensor configuration differs from the preload; use a standard IS200DTTCH1A and configure manually. For high-EMI environments, consider the IS200DTCIH1A despite its slower update rate.
Precautions and Important Notes
Always use ESD-safe handling procedures when installing the IS200DTTCH1ABB. Verify that the preloaded “ABB” configuration matches your specific thermocouple types and calibration requirements. Use proper thermocouple extension wire matched to the sensor type. Ensure adequate cable shielding and grounding to minimize EMI. Allow the IS200DTTCH1ABB to stabilize for 30 minutes after power-up before relying on readings. Never connect voltage or current signals to thermocouple inputs. When replacing a IS200DTTCH1A with a IS200DTTCH1ABB, reconfigure ToolboxST to recognize the new board. Do not mix IS200DTTCH1ABB with other thermocouple board variants in redundant pairs without verifying identical configuration. Store spare boards in anti-static packaging and rotate inventory every 24 months. Consult GE engineering when using the IS200DTTCH1ABB in high-EMI environments or with non-standard thermocouple types not covered by the preload.
A-B 1771-IR
SCHNEIDER 140ACI04000
SCHNEIDER 140CRA93200
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