GE IS200TBTCH1B TBTC Terminal Board – 24 TC Inputs, Mark VI Series, TMR Ready

Product Brief – IS200TBTCH1B

IS200TBTCH1B is a thermocouple input terminal board from GE Mark VI Speedtronic series. It handles 24 thermocouple channels (E, J, K, S, T) and supports TMR configurations with 6 DC connectors. Designed for turbine temperature monitoring in simplex and redundant systems.

Core Specifications

• Part Number: IS200TBTCH1B
• Manufacturer: General Electric (GE)
• Series: Mark VI Speedtronic
• Product Type: Thermocouple Input Terminal Board
• Channels: 24
• Thermocouple Types: E, J, K, S, T (B, N, R with PTCCH2 in Mark VIe)
• Input Span: -8 mV to +45 mV
• Operating Temp: 0 to +45 °C
• Dimensions: 15.9 x 17.8 cm
• Connectors: Six DC-type (for TMR); two barrier terminal blocks (48 terminals)
• Country of Origin: USA
• Manual Reference: GEH-6421M

Hardware & Functional Features

• Two long terminal blocks – 48 silver cube terminals (numbered 1–48).
• Two jack ports labeled JA1 and JB1.
• Rows of blue resistors and silver capacitors span the board length.
• Conformal coating for PCB protection.
• Shield terminal strip on each block for chassis ground connection.
• Accepts wires up to #12 AWG.

Installation & Operation

• Wire thermocouples directly to the two removable I/O terminal blocks.
• Each block secured with two screws; terminals accept up to #12 AWG.
• For Mark VI systems, cable J-type connectors to I/O processors in VME rack.
• Supports grounded or ungrounded thermocouples up to 300 m away (450 Ω max loop resistance).
• High-frequency noise suppression plus two cold junction (CJ) references.
• I/O processor handles A/D conversion and linearization.

System Configurations – Suitable Equipment

• Mark VI Simplex: TBTCH1C + one VTCC processor (two cables).
• Mark VI TMR: IS200TBTCH1B + three VTCC boards (six cables).
• Mark VIe Simplex: two PTCC packs plugged into TBTC for 24 inputs.
• Mark VIe TMR: TBTCH1B with fan-out to three J-connectors.
• Capacity: Mark VI = 24 inputs; Mark VIe = 12 inputs per pack.

Oiltech Controls’s Insight

• Choose TBTCH1B for TMR applications – it has six DC connectors vs two on the simplex version.
• For Mark VIe, B/N/R thermocouples require PTCCH2 – verify compatibility.
• Always check cable resistance: max 450 Ω two-way for accurate readings.
• Use shielded thermocouple wires and connect shield to chassis ground to reduce noise.
• The conformal coating enhances durability in harsh turbine environments.

5 Professional FAQs (with experience & selection guide)

• Q1: What is the difference between TBTCH1B and TBTCH1C?
  A: TBTCH1B is for TMR systems with six DC connectors; TBTCH1C is for simplex with two connectors. Select based on your system redundancy requirement.
• Q2: Can I use this board with B, N, or R thermocouples?
  A: Yes, but only in Mark VIe systems when paired with PTCCH2. In standard Mark VI, only E, J, K, S, T are supported.
• Q3: What is the maximum distance between thermocouple and board?
  A: Up to 300 meters (984 ft) with total two-way cable resistance below 450 Ω. Longer runs may cause measurement errors.
• Q4: How do I handle noise suppression for thermocouple inputs?
  A: The board includes high-frequency noise filters. Always ground shields at the chassis ground terminal strip on each block.
• Q5: Is this board compatible with Mark VIe systems?
  A: Yes, when used with PTCC I/O packs. For TMR, use TBTCH1B with three PTCC packs; for simplex, use two PTCC packs with TBTCH1C.

Why Buy From Oiltech Controls?

• Over 15 years in industrial automation spare parts.
• Global shipping via FedEx, UPS, DHL – 24~28 hour dispatch.
• Every unit tested – surplus or refurbished options available.
• 12-month warranty on all products.
• Technical verification performed before shipment.
• Expert support for obsolete control systems.

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