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SPECIFICATIONS:
Part No: IC3603A277A
Manufacturer: General Electric
Series: Mark II
Module Type: Thermocouple Averaging Relay
Input Channels: Up to 6 or 12 thermocouples
Supported Thermocouple Types: Type K, Type J
Input Range: -10 mV to +50 mV
Output Signal: 0–10 VDC or 4–20 mA
Output Load Resistance: ≤500 Ω
Accuracy: ±0.25%
Signal Conditioning: Low-pass filtering
Input Impedance: >1 MΩ
Operating Temperature: -40°C to +70°C
Storage Temperature: -55°C to +85°C
Relay Contact Rating: 24 VDC / 0.5 A
Power Supply Requirement: +24 VDC
Power Consumption: <5 W
Board Size: 2.8 cm high x 8.6 cm
Weight: 0.45 kg
Availability: In Stock
Country of Origin: USA
FUNCTIONAL DESCRIPTION:
IC3603A277A is a Thermocouple Averaging Relay Module manufactured and designed by General Electric as part of the Mark II Series used in GE Speedtronic Control Systems. The Thermocouple Averaging Relay Module is a high-reliability signal conditioning unit designed for critical thermal monitoring applications in industrial turbine environments. It is engineered to process and mathematically average multiple thermocouple signals, providing a single analog output representative of the overall system temperature. This module is integral to turbine protection schemes, offering enhanced fault tolerance, reduced noise susceptibility, and increased operational stability in GE Mark I and Mark II Speedtronic control systems.
INSTALLATION:
The Thermocouple Averaging Relay Module is installed in a designated card rack or panel slot within the control cabinet, typically on a backplane that provides mechanical support and electrical interconnection. Installation procedures must adhere to ESD safety protocols to avoid damage to semiconductor components. All thermocouple inputs should be terminated using shielded twisted-pair cables with proper cold-junction compensation. Input wiring must conform to ANSI or IEC thermocouple standards, and the cable shielding must be properly grounded at a single point to mitigate common-mode interference.
Configuration switches or internal jumpers (depending on the revision) must be set before commissioning to determine the averaging method (e.g., simple arithmetic, with or without redundancy logic). Terminal torque settings, ambient thermal limits, and installation clearances must conform to manufacturer specifications. Ensure compliance with IEEE 518 for signal cable routing to minimize induced EMI from adjacent power conductors.
OPERATION:
During runtime, the module receives millivolt-level analog inputs from up to 6–12 type K or J thermocouples, depending on system design. Internally, the module performs analog signal conditioning, including cold-junction compensation, linearization (if applicable), and signal filtering. It then computes a weighted or unweighted average, depending on the configured logic.
The resulting output is a stable DC analog voltage proportional to the mean temperature across the monitored points. This signal is transmitted to the turbine controller for continuous process monitoring. The module includes onboard solid-state relays that can trigger protective interlocks or alarm circuits if pre-set thermal thresholds are exceeded, as defined in the control system logic.
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How does the module handle multiple thermocouple inputs for accurate averaging?
The module accepts multiple low-level DC voltage inputs from individual thermocouples, typically ranging from 6 to 12 channels, depending on the variant. It utilizes a precision analog summing amplifier or microcontroller-based logic to compute the arithmetic mean of the temperature inputs.
What type of output does the module generate, and how is it used in turbine control?
The module provides a linear analog output that represents the average temperature reading from all connected thermocouples. This output is typically in the form of a 0–10 VDC voltage signal or a 4–20 mA current loop, depending on the system requirements.
What kind of output signals can be expected from the module?
The output format depends on the module design, but typically includes a standard analog signal such as 0–10 V or 4–20 mA representing the averaged temperature. Some modules also include relay outputs that close or open contacts when the averaged temperature crosses a preset threshold.
