GE IS200TBTCH1C IS200TBTCH1CAA | Thermocouple Terminal

Core Function and System Role

The GE IS200TBTCH1C terminates thermocouple signals for Mark VI temperature monitoring. Specifically, this board connects directly to J, K, and T type sensors. Moreover, it provides cold junction compensation for accurate measurements. The IS200TBTCH1CAA variant includes enhanced noise filtering for industrial environments.

Technical Specifications Overview

This thermocouple terminal board features sixteen independent input channels. Each channel provides 16-bit resolution for precise temperature readings. Furthermore, the board includes automatic cold junction compensation on every channel.

Parameter	Specification
Part Number	IS200TBTCH1C / IS200TBTCH1CAA
Type	Thermocouple Terminal Board / Temperature Input
Input Channels	16 Channels
TC Types	J, K, T, E, R, S
Temperature Range	-200°C to +1800°C (Type Dependent)
Resolution	16 Bits (0.1°C Typical)
Accuracy	±0.5°C (J,K,T) / ±1.0°C (R,S)
Cold Junction Comp.	Automatic, Onboard Sensor
CJC Accuracy	±0.25°C
Input Impedance	10 MΩ
Common Mode Rejection	120 dB at 60 Hz
Power Supply	24 Vdc ±15%
Connector Types	2 x 50-pin D-sub, 4 x Terminal Blocks
Dimensions (W x H x D)	220 x 130 x 30 mm
Weight	0.82 kg
Onboard Energy Storage	8 x 100 µF, 35V Capacitors

Connector Layout and Component Count

The board uses four terminal blocks for thermocouple wiring. For instance, block TB1 handles channels 1 through 4. Meanwhile, block TB2 manages channels 5 through 8. Blocks TB3 and TB4 handle channels 9 through 16. Two 50-pin D-sub connectors route digitized temperatures to the controller. The IS200TBTCH1CAA adds six filter capacitors for noise reduction.

Energy Storage and Signal Integrity

This thermocouple board includes local capacitance for stable conversion. Specifically, eight 100 µF capacitors filter the 24 Vdc supply. Therefore, the board maintains accurate readings during power fluctuations. Additionally, onboard LED indicators show power and channel status. For example, a green LED confirms proper logic power. Red LEDs illuminate when any thermocouple experiences an open circuit.

Diagnostic Features and Fault Detection

The board continuously checks each channel for open thermocouple wires. Consequently, it detects sensor breaks within 10 milliseconds. Moreover, the GE IS200TBTCH1C IS200TBTCH1CAA includes a built-in reference junction verification. This feature confirms that the cold junction sensor works correctly. An onboard status register reports all channel health to the main controller.

Maintenance and Hot Replacement

You can replace this terminal board without powering down the turbine. Thus, mean time to repair remains under ten minutes. The board stores no calibration data locally. Therefore, you simply install the replacement and resume normal temperature monitoring.

Industrial Applications

This thermocouple terminal board works inside GE Mark VI control cabinets. For reliable GE temperature measurement, the IS200TBTCH1C and IS200TBTCH1CAA deliver exceptional performance. They provide accurate thermocouple interfacing for steam and gas turbine exhaust and bearing monitoring.