Description

The GE IS200TBCIH2BCE is a specialized terminal board module developed by General Electric as part of the Mark VIe distributed control system platform, widely used in gas and steam turbine applications. Serving as the field-wiring interface for temperature measurement, the GE IS200TBCIH2BCE works in tandem with its companion VME card—the IS200TVCIH2B—to provide high-density, isolated thermocouple (TC) and resistance temperature detector (RTD) input channels. This modular architecture separates signal conditioning (on the terminal board) from digital processing (on the VME card), enhancing maintainability and reducing downtime during troubleshooting or replacement.

Positioned within GE’s System 200 I/O family, the GE IS200TBCIH2BCE supports up to 16 temperature inputs with built-in cold junction compensation (CJC), linearization, and filtering, ensuring accurate thermal monitoring of critical turbine components such as bearings, exhaust manifolds, and combustion cans. Its robust design meets stringent industrial standards for electrical isolation, electromagnetic compatibility, and environmental resilience—making it indispensable in power generation, oil & gas, and heavy industrial settings where temperature integrity directly impacts safety, efficiency, and regulatory compliance.

Technical Specifications

Main Features and Advantages

Precision temperature acquisition is at the heart of the GE IS200TBCIH2BCE, which delivers laboratory-grade signal conditioning in an industrial form factor. Each of its 16 channels features independent cold junction compensation using a high-stability onboard sensor, eliminating errors caused by ambient fluctuations at the terminal block—a common issue in legacy systems. The module supports multiple thermocouple types (J, K, T, etc.) and RTDs (Pt100, Ni120), offering flexibility across diverse turbine designs without requiring hardware changes.

Robust electrical isolation (500 VDC) between channels and to ground ensures that ground loops, common-mode noise, or transient surges do not corrupt sensitive millivolt-level thermocouple signals. This is critical in electrically noisy environments like switchyards or near large motors. The GE IS200TBCIH2BCE also includes low-pass filtering and overvoltage clamping, further enhancing signal fidelity before analog data is passed to the IS200TVCIH2B for digitization and transmission to the Mark VIe controller.

Mechanically, the GE IS200TBCIH2BCE uses maintenance-friendly spring-clamp terminals that accept stranded or solid conductors without crimping or soldering—reducing wiring time and improving connection reliability. The board mounts directly onto the Mark VIe I/O chassis and connects to its VME counterpart via a high-density backplane, enabling hot removal of field wiring without disturbing the control-side electronics. When deployed in redundant Mark VIeS configurations, dual GE IS200TBCIH2BCE boards can feed independent control processors, supporting SIL 2/3 safety functions per IEC 61508/61511.

Application Field

The GE IS200TBCIH2BCE is primarily deployed in gas turbine control systems—such as GE’s 7FA, 9E, and HA-class units—where precise temperature monitoring is essential for combustion stability, emissions control, and mechanical protection. It interfaces with thermocouples embedded in turbine bearings to detect overheating due to lubrication failure, and with exhaust thermocouples to balance firing temperatures across combustor cans, preventing hot spots that could damage blades.

In steam turbine applications, the GE IS200TBCIH2BCE monitors steam chest, gland seal, and generator winding temperatures, feeding data into protective relays and control algorithms that prevent thermal stress or insulation breakdown. Beyond power generation, it is also used in oil & gas compressor trains, industrial cogeneration plants, and marine propulsion systems utilizing GE turbine technology. These installations often operate in remote or hazardous locations, where the GE IS200TBCIH2BCE’s immunity to electrical noise and wide operating temperature range ensure consistent performance without frequent recalibration or maintenance.

Related Products

IS200TVCIH2B: Companion VME card that processes signals from IS200TBCIH2BCE
IS200TBCIH2BCC: Alternate variant with different terminal labeling or certification
IS200TBQIH1A: Quadruple analog output terminal board (for 4–20 mA valve control)
IS200TBSVH1B: Solenoid valve driver terminal board for fuel stop valves
IS200SPROH1B: Mark VIe main controller module (receives processed temperature data)
IS200PSMH1A: Power supply monitor board for I/O chassis health
IC695TCM001: GE PACSystems thermocouple module (different platform, non-Mark VIe)
336A5977P1: Mark VIe I/O chassis backplane (hosts terminal boards like IS200TBCIH2BCE)

Installation and Maintenance

Pre-installation preparation: Ensure the Mark VIe I/O chassis is powered down before installing the GE IS200TBCIH2BCE. Confirm compatibility with the installed IS200TVCIH2B VME card—firmware and hardware revisions must match. Route thermocouple extension wires using twisted-pair, shielded cable, with shields grounded at the controller end only to avoid ground loops. Connect field wires to the spring-clamp terminals firmly; verify polarity for thermocouples (positive/negative per type).

Maintenance recommendations: The GE IS200TBCIH2BCE contains no user-replaceable components, but periodic inspection of terminal tightness and signs of corrosion is recommended—especially in high-humidity or corrosive atmospheres. Use a calibrated temperature simulator to validate channel accuracy during plant outages. If erratic readings occur, check for damaged thermocouple wires or loose connections before replacing the board. Always handle the GE IS200TBCIH2BCE with ESD-safe procedures, as static discharge can damage sensitive front-end amplifiers.