IS230TNTCH1B - Thermocouple Input Assembly

IS230TNTCH1B - Thermocouple Input Assembly IS230TNTCH1B - Thermocouple Input Assembly

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Part Number: IS230TNTCH1B
Manufacturer: General Electric
Series: Mark VIe
Function: Thermocouple Input Assembly
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS230TNTCH1B is a Thermocouple Input Assembly manufactured and designed by General Electric. It is a part of the Mark VIe Control System. The assembly consists of the TBTCH1B terminal board and three PTCCH1B packs. The TBTCH1B terminal board serves as the central hub for connecting the thermocouple inputs, providing a convenient and organized interface. It is designed to accommodate up to 24 thermocouple inputs, enabling the monitoring of multiple temperature points within the system. Each PTCCH1B pack is responsible for the conditioning and digitization of the thermocouple signals. These packs are specifically designed to ensure accurate and reliable temperature measurement. They incorporate precision circuitry that amplifies, linearizes, and compensates for cold junction temperature variations. The conditioning process ensures that the thermocouple signals are transformed into digital data that can be effectively processed by the control system. The TBTCH1B terminal board and PTCCH1B packs are engineered to provide robust and accurate thermocouple input capabilities. They can handle various thermocouple types, such as Type K, Type J, Type T, etc., allowing for flexibility in temperature measurement across a wide range of applications.


  • Each thermocouple type within the Thermocouple Input Assembly is equipped with Hardware Limit Checking (HLC) capabilities. These HLC parameters consist of preset high and low levels set near the ends of the thermocouple's operating range. If a thermocouple input exceeds these preset limits, a logic signal is triggered, indicating that the input is no longer valid and should not be scanned. This protective mechanism ensures that out-of-range measurements are not considered for further processing, maintaining the integrity and accuracy of the temperature data.
  • In the event that any one of the thermocouple inputs triggers the hardware limits, a composite diagnostic alarm is generated. This alarm serves as an indicator that at least one thermocouple input has exceeded its hardware limits, allowing for swift identification and resolution of the issue. The composite diagnostic alarm provides an overview of the board's condition and prompts further investigation into the specific input that triggered the alarm.
  • Each board connector in the assembly is equipped with its own ID device, which is interrogated by the I/O board. This ID device contains vital information such as the terminal board's serial number, board type, revision number, and the specific J connector location. During the interrogation process, the I/O board compares the ID information with its own records to ensure compatibility and proper configuration. In the case of a mismatch, indicating a hardware incompatibility, a fault is generated to alert the system of the discrepancy.
  • To detect open circuits in the thermocouple paths, a very small current is injected into each thermocouple path while operating with the I/O board. This current is deliberately injected in a polarity that would create a high temperature reading if a thermocouple were to open. By monitoring the thermocouple readings, the system can detect any anomalies caused by open circuits and take appropriate actions to mitigate potential inaccuracies in temperature measurement.
  • The incorporation of HLC, ID devices, and open circuit detection mechanisms in the Thermocouple Input Assembly ensures the integrity, compatibility, and accuracy of temperature measurements within the Mark VIe Control System. These features enhance the system's overall reliability, performance, and diagnostic capabilities, providing operators with valuable information to maintain optimal control and monitoring of temperature variables.

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What is IS230TNTCH1B?
It is a Thermocouple Input Assembly manufactured and designed by General Electric

What happens if a fault is detected in the cold junction?
If a fault is detected in the cold junction, the system switches to the backup value. The backup value can be derived from CJ readings on other terminal boards within the system. Alternatively, it can be a pre-configured default value that has been set based on system requirements and specifications.

How is the backup value determined in case of a cold junction fault?
The backup value is derived either from CJ readings on other terminal boards or is a pre-configured default value. In cases where multiple terminal boards are present, the system can utilize readings from other CJ points to determine the backup value. This ensures that temperature measurement and control can continue seamlessly, even in the presence of a CJ fault.

What is the purpose of the backup value in the event of a CJ fault?
The backup value is used to ensure continuity of temperature measurement and control when a CJ fault occurs. By switching to the backup value, the system can still make reliable temperature calculations and adjustments, minimizing any disruption or impact caused by the CJ fault.