IS200TBTCH1B GE Speedtronic TBTC Termination PCB Card

Product Description

The IS200TBTCH1B is a high-density Thermocouple Input Terminal Board (TBTC) designed specifically for the General Electric Speedtronic Mark VI control system. This board serves as the primary interface for collecting and conditioning millivolt-level signals from field-mounted thermocouple sensors. By converting raw analog inputs into logic-level data, the IS200TBTCH1B provides the Mark VI controller with critical temperature telemetry required for turbine protection, exhaust spread analysis, and combustion optimization.

Engineering for high-availability environments, the IS200TBTCH1B features 24 isolated input channels, each capable of supporting a wide array of thermocouple types including J, K, T, E, R, S, B, and N. A key technical advantage of this board is its integrated Cold Junction Compensation (CJC) hardware. Using high-stability digital sensors with an accuracy of ±0.3 °C, the module eliminates the need for external reference junctions, ensuring precise temperature measurement even in the fluctuating thermal environments of a turbine control cabinet.

Technical Specifications

• Model Number: IS200TBTCH1B

• System Platform: GE Mark VI Speedtronic

• Functional Acronym: TBTC (Thermocouple Terminal Board)

• Input Capacity: 24 High-density thermocouple channels

• Thermocouple Compatibility: Types J, K, T, E, R, S, B, N (Software selectable)

• Input Signal Range: ±50 mV (Covers standard industrial thermocouple curves)

• Cold Junction Compensation: Built-in digital CJC sensor, accuracy ±0.3 °C

• Measurement Accuracy: ±0.25% of full scale within 0–70 °C environment

• Scanning Rate: 10 Hz per channel for real-time monitoring

• Isolation Protection: 500 VDC channel-to-channel and channel-to-ground

• Noise Rejection (CMRR): ≥100 dB @ 50/60 Hz to suppress EMI/RFI

• Field Connection: Two 48-point screw-type terminal blocks

• Operating Temperature: -20 °C to +60 °C (-4 °F to 140 °F)

• Storage Temperature: -40 °C to +85 °C

• Physical Dimensions: 170 mm × 90 mm

• Weight: 0.38 kg (Net)

• Standards Compliance: IEC 61326-1 EMC standards

System Role & Application

In the Mark VI architecture, the IS200TBTCH1B is typically paired with a V-series processor card (such as the VTCC). It is the first point of contact for turbine exhaust gas temperature (EGT) thermocouples, wheel space temperature sensors, and bearing metal temperature probes. Its robust hardware filtering and high Common Mode Rejection Ratio make it particularly effective in power plant environments where high-voltage equipment often generates significant electrical noise.

Frequently Asked Questions

Does the IS200TBTCH1B support Simplex or TMR configurations?

The IS200TBTCH1B can be utilized in both Simplex and Triple Modular Redundancy (TMR) systems. In a TMR setup, the signals from this terminal board are fanned out to three separate I/O processors (R, S, and T) to ensure that a single processor failure does not affect the integrity of the temperature data.

How do I configure a specific channel for a Type K vs. Type J thermocouple?

Channel configuration is handled via the Toolbox or ToolboxST software. The IS200TBTCH1B hardware is universal; once the software defines the thermocouple type, the controller applies the appropriate linearization curve to the millivolt signal received from the board.