24 Thermocouple Channels Behind One Faceplate

A tested spare on the shelf is often the difference between a same-shift fix and a stalled restart — and for Mark VI temperature inputs, the spare that matters is this one. IS200VTCCH1C is the VTCC Thermocouple Processor Board: the rack card responsible for turning up to 24 field thermocouple signals into the temperatures your control and protection logic act on. Type E, J, K, S, and T sensors are supported, wired out at the TBTC terminal board and brought to the card through the rack's J3 and J4 cable connectors.

The field side it serves is forgiving by design, which is worth knowing when you troubleshoot: GE documents that the thermocouples may be grounded or ungrounded, may sit up to 300 m (984 ft) from the control cabinet, and are acceptable up to 450 ohms of two-way loop resistance, with high-frequency noise suppression built into the terminal board ahead of the card. On the card itself, each input type gets its own software linearization, and cold junction compensation is applied from reference devices — two per card, one tied to each input connector.

Read the Evidence Before Ordering a Replacement Card

The system leaves clues about where a temperature problem actually lives. Use them:

• Channel dropped from scan? The VTCC deliberately removes an input that violates hardware limits so it cannot disturb the other 23. That mechanism fires far more often for failed thermocouples and broken extension wire than for card faults — walk the loop out to the sensor first.
• Reading drifts or steps but the sensor checks out? Measure loop resistance at the TBTC block against the 450-ohm allowance, inspect terminal tightness, and confirm polarity; a marginal splice behaves exactly like a lazy thermocouple.
• Failures aligned to one of the two input cables? Reseat and inspect the cable and its connector at the rack before touching the card — half-board failures follow the cable boundary.
• Consistent bias across many channels? Suspect the cold junction path. Documentation puts cold junction accuracy at 2 degrees Fahrenheit and notes any compensation error carries straight through to the displayed value.
• Redundant system? In TMR configurations, the same sensors feed the <R>, <S>, and <T> sections, so a disagreement isolated to one section points at that section's card or cabling — a comparison that costs nothing and settles most arguments.

Suffix Logic on a VTCC Label

On the label of this unit you will find IS200VTCCH1CBD. Decoded: IS200 identifies the Speedtronic board series; VTCC is the function code, with the V prefix marking a rack-resident processor card as opposed to the T-prefix terminal boards; H1 is the hardware group; C the functional revision; and BD the manufacturing revision pair. Two practical rules follow. First, the group digit is functional: H1 cards cover E/J/K/S/T thermocouples and millivolt inputs from -8 to +45 mV, and GE documented the H2 group for type B, N, R sensors and for millivolt ranges outside that span. Second, trailing revision letters are for matching, not guessing — quote the whole string and let us verify. Our GE Speedtronic Part Number Decoder walks through every field with examples.

Companion Hardware in the Thermocouple Chain

A temperature channel on this platform is a chain of documented parts: the TBTC terminal board (offered in simplex and TMR versions, with cold junction devices and noise suppression on board), the molded latching cables into the rack, and the VTCC card reading them — with the DIN-rail DTTC board also documented as an input source for this card family. On later Mark VIe systems the reading function migrates to the IS220PTCC I/O pack while the terminal-board concept persists. If a failure diagnosis lands on a different link than the card, we quote those parts too — the platform's boards are collected under GE Mark VI IS200 Boards and the wider GE Speedtronic Turbine Control Boards.

What Your Quote Request Should Contain

• The full number from your card's label (this listing: IS200VTCCH1CBD) — a label photo removes all doubt
• Turbine model, Mark generation, and simplex/TMR architecture
• What the diagnosis showed (dropped channel, cable-side failure, fail LED) — it helps us sanity-check the fit
• Quantity, condition preference, and the date you need it on site

Cleaned and Tested IS200VTCCH1CBD — Get a Quote

This card is supplied used, cleaned and tested, with the warranty stated in the table below. Press Request a Quote and our team will answer within 24 hours. Worldwide DDP shipping and purchase orders are standard practice here.

General Information about the Product
Part Number	IS200VTCCH1C Mark VI IS200
Description	IS200VTCCH1C By GE IS200VTCCH1CBD Thermocouple Input Board Mark VI IS200
Condition	used Cleaned and Tested. With 1 Year Warranty.