IS230TNTCH3C - Thermocouple Input Assembly Board

SPECIFICATIONS:

Part Number: IS230TNTCH3C
Manufacturer: General Electric
Series: Mark VIe
Product Type: Thermocouple Input Assembly Board
Number of channels: 12
Common Mode Voltage Range: +5 V dc
Maximum Lead Resistance: 15Ω
Analog output current: 0-20 mA
Operating temperature: -30 to 65 °C
Size: 8.26 cm high x 4.18 cm
Frequency: 50 or 60 Hz
Repair: 3-7 days
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

IS230TNTCH3C is a Thermocouple Input Assembly Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The Thermocouple Input Assembly Board is designed to accurately receive and process temperature readings from thermocouple sensors. It serves as an interface between the thermocouples and the main control or monitoring system, converting the millivolt-level analog signals generated by the thermocouples into conditioned signals suitable for further processing. The board typically supports multiple thermocouple types, such as Type J, K, T, E, N, R, S, and B, allowing for a wide range of industrial applications. It includes cold junction compensation (CJC) to ensure precise temperature measurement by accounting for variations at the connection point. Signal conditioning features such as amplification, filtering, and linearization are integrated to ensure clean and accurate signal output. Many boards also include built-in diagnostics, channel isolation, and protection circuits to ensure safe and reliable long-term operation in harsh industrial environments.

INSTALLATION:

The board is usually mounted in a control cabinet, either on a DIN rail, in a rack system, or as a plug-in PCB module, depending on the manufacturer’s design. Thermocouple wires must be connected directly to the designated terminals on the board, and the polarity must be observed to avoid incorrect readings. It is important to avoid extending thermocouple leads with dissimilar metals to prevent thermoelectric errors. Proper grounding and shielding of the thermocouple leads and input board are crucial to minimize electrical noise and ensure measurement integrity. Once installed, the system may require configuration through the associated controller or software interface to define thermocouple type, measurement range, and alarm thresholds.

OPERATION:

These voltages are interpreted based on the selected thermocouple type’s temperature-voltage relationship and adjusted using the board’s cold junction compensation circuitry. The board conditions and linearizes the signal, ensuring the output reflects an accurate temperature reading. Depending on the system, the board may output the temperature data as analog signals, digital data over a communication bus, or directly into a programmable logic controller (PLC) or distributed control system (DCS). In some configurations, the board supports diagnostic features such as open-circuit detection or thermocouple burnout indication.

COMPATIBILITY:

Boards are often part of larger systems such as GE Mark VIe, Allen-Bradley ControlLogix, or Siemens PCS7, and can be integrated with PLCs, DCS, or standalone monitoring units. Compatibility depends on both electrical and communication standards, such as input voltage ranges, supported thermocouple types, signal resolution, and data communication protocols (e.g., Modbus, Profibus, Ethernet/IP). The board may also require specific firmware or configuration software to interface correctly with the host system. It is important to verify the specific part number, channel configuration, and firmware version to ensure seamless integration with the intended application.

WOC maintains the largest inventory of replacement parts for GE Distributed Turbine Control Systems. We offer both new and refurbished boards, all backed by warranty, along with reliable repair services for malfunctioning components. Our experienced support team is available 24/7 to meet your OEM and automation requirements. For pricing, availability, or technical assistance, feel free to contact us by phone or email—our experts are always here to help.

FREQUENTLY ASKED QUESTIONS:

What is the input voltage range for thermocouple signals?

Thermocouple signals are typically in the millivolt range. The board can handle input ranges from approximately -10 mV to +70 mV, depending on the thermocouple type.

How does the board perform cold junction compensation (CJC)?

The board includes built-in temperature sensors near the input terminals to measure ambient temperature. This reading is used to automatically apply cold junction compensation to the thermocouple signal.

What is the resolution of the A/D conversion?

Most high-quality thermocouple input boards use 16-bit or 24-bit analog-to-digital converters (ADCs), allowing precise temperature measurements even with small signal variations.