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GE IC3600ALTC1A
Product Overview
The GE IC3600ALTC1A is a dedicated thermocouple input/temperature control module for GE’s Mark I Speedtronic™ gas turbine control system. Designed for precise monitoring and control of critical gas turbine temperature parameters—such as exhaust temperature (TTRF) and bearing temperature—it serves as a core protection component in early Speedtronic™ systems.
The IC3600ALTC1A features a discrete solid-state circuit design, supporting 8-channel thermocouple (TC) inputs (types K/J/E). It ensures temperature measurement accuracy through cold junction compensation (CJC) technology. The module outputs a standard 0-10V DC signal to the Mark I control system, which is used for over-temperature alarm and combustion control logic. Its military-grade reliability design enables it to operate in harsh environments such as power plants and oil platforms for over 30 years.
Product Parameters
- Product Model: IC3600ALTC1A
- Manufacturer: GE Energy (Speedtronic™ Series)
- Product Type: Thermocouple input/temperature control module
- Input Channels: 8 channels (thermocouple types K/J/E)
- Measurement Range: K type: 0-1372°C; J type: 0-760°C
- Cold Junction Compensation: Built-in CJC sensor (±1°C accuracy)
- Output Signal: 0-10V DC (linearly corresponding to temperature range)
- Accuracy: ±0.5% F.S. (full scale)
- Isolation Voltage: 500V AC (between channels)
- Operating Temperature: -20°C ~ +60°C
- Supply Voltage: 24V DC (±10%)
- Compatible System: GE Mark I Speedtronic
- MTBF: 150,000 hours (per MIL-HDBK-217F)
Structure and Composition
The IC3600ALTC1A adopts a modular metal housing, with its internal structure divided into three layers:
Signal Conditioning Layer
- Each channel is equipped with an independent low-noise amplifier + non-linear correction circuit (tailored to thermocouple characteristics).
- Cold junction compensation uses a precision thermistor (mounted on the terminal block).
Conversion and Protection Layer
- A V/F conversion circuit converts temperature signals into frequency, which is then filtered to generate a 0-10V output.
- Each channel is equipped with a self-resetting fuse and a TVS diode (for surge protection).
Backplane Interface Layer
- Communicates with the Mark I rack via a 34-pin gold-plated connector.
- Status indicators (green = normal; red = over-limit).
Key Features and Advantages
Gas Turbine-Specific Design
- Optimized for TTRF (Turbine Trip Reference) signals, with a response time of <100ms.
- Certified to API 670 mechanical protection standards.
High-Reliability Architecture
- Fully discrete component design (no vulnerable electrolytic capacitors) to adapt to high-temperature environments.
- Gold-plated contact connectors for strong corrosion resistance.
Maintenance-Friendly
- Modular plug-in design allows for quick on-site replacement.
- Independent isolation between channels ensures faults in one channel do not affect others.
Long-Term Spare Parts Support
- GE commits to providing lifetime spare parts supply for Mark I systems (advance ordering required).
Application Fields
Gas Turbine Protection
- Exhaust temperature monitoring (prevents turbine damage due to overheating).
- Bearing temperature alarm (interlocks with the IC3600SFFC1 safety module).
Steam Turbine Systems
- Cylinder metal temperature monitoring (for retrofitting old power plants).
Industrial Combustion Control
- Multi-point temperature monitoring of boiler furnaces.
Installation and Maintenance
Pre-Installation Preparation
- Use a millivolt signal source (e.g., Fluke 724) to verify the linearity of each channel.
- Ensure correct thermocouple polarity (positive/negative terminals match labels).
- Check that the rack grounding resistance is <1Ω (to prevent common-mode interference).
Maintenance Recommendations
- Calibrate every 2 years (using a dry-block calibrator as the simulated temperature source is recommended).
- Regularly clean terminal oxidation layers (use DeoxIT® D series contact cleaner).
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