IS200TBTCS1C - Thermocouple Input Terminal Board

IS200TBTCS1C - Thermocouple Input Terminal Board IS200TBTCS1C - Thermocouple Input Terminal Board

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Part Number: IS200TBTCS1C
Manufacturer: General Electric
Series: Mark VI
Product Type: Thermocouple Input Terminal Board
Number of Channels: 24
Span: -8 mV to +45 mV
Technology: Surface Mount
Common Mode Voltage Range: ±5 V
Dimensions: 11.00 x 9.00 x 3.00
Operating temperature: 0 to 60 °C
No.of Ribbon Cable Connectors: Two, 20-pin
No.of VMEbus Connectors Two, 96-pin
No.of Analog Voltage Inputs: 6
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421M


IS200TBTCS1C is a Thermocouple Input Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Turbine Control Systems. The Thermocouple Input (TBTC) terminal board accepts 24-type E, J, K, S, or T thermocouple inputs. It accepts additional B, N, and R types of thermocouple inputs only when used with PTCCH2 in Mark VIe. These inputs are wired to two barrier-type blocks on the terminal board. TBTC communicates with the I/O processor through DC-type connectors. In the Mark VI system, TBTC works with the VTCC processor and supports simplex and TMR applications. One TBTCH1C connects to the VTCC with two cables. In TMR systems, TBTCH1B connects to three VTCC boards with six cables.


Connect the thermocouple wires directly to the two I/O terminal blocks. These removable blocks are mounted on the terminal board and held down with two screws. Each block has 24 terminals accepting up to #12 AWG wires. A shield terminal strip attached to the chassis ground is located on the left side of each terminal block. In Mark VI systems, cable the TBTC J-type connectors to the I/O processors in the VME rack. In Mark VIe systems, plug the I/O packs directly into the TBTC J-type connectors. The number of cables or I/O packs depends on the level of redundancy required.


The 24 thermocouple inputs can be grounded or ungrounded. They can be located up to 300 m (984 ft) from the turbine control panel with a maximum two-way cable resistance of 450 Ω. TBTC features high-frequency noise suppression and two CJ reference devices, as shown in the following figure. The I/O processor performs the analog-to-digital conversion and the linearization for individual thermocouple types. In Mark VI simplex systems using TBTCH1C, one VTCC is used. In Mark VIe simplex systems, two PTCC packs plug into TBTC, obtaining 24 thermocouple inputs. For TMR systems using TBTCH1B, the thermocouple signals fan out to three J- connectors. The Mark VI system accommodates 24 inputs and the Mark VIe system accommodates 12 inputs. The TBTC terminal board supports all thermocouple spans documented for the associated thermocouple I/O processor.

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What is a thermocouple input terminal board?

A thermocouple input terminal board is a device used to interface thermocouples with measurement or control systems. It typically provides a connection point for multiple thermocouples and often includes signal conditioning circuitry.

What is the purpose of a thermocouple input terminal board?

The primary purpose is to provide a convenient and standardized way to connect thermocouples to measurement or control equipment. It helps ensure accurate and reliable temperature measurement by properly handling the signals from the thermocouples.

How does a thermocouple input terminal board work?

Thermocouple input terminal boards work by receiving the millivolt-level signals generated by thermocouples due to temperature differences. They then condition these signals, amplifying and/or filtering them as necessary to provide a clean and accurate signal for further processing by the measurement or control system.