IS200VTCCH2C: The Extended-Range Thermocouple Processor

Most Mark VI thermocouple channels run on the common sensor types — E, J, K, S, and T — and the standard H1-group card handles exactly those. The IS200VTCCH2C is the other case. It is the hardware group 2 build of GE's VTCC Thermocouple Processor Board, and group 2 is what distributor documentation prescribes when a system needs type B, N, or R thermocouples, or millivolt input ranges beyond the H1 card's -8 to +45 mV span (specifically -20 to -9 mV and +46 to +95 mV). Same family, same slot in the architecture, different measurement envelope.

Architecturally it works like every VTCC: a VME rack card in the Mark VI control system that accepts 24 thermocouple inputs, wired from the field onto the two terminal blocks of a TBTC terminal board and cabled into the rack's J3 and J4 connectors. The card linearizes each channel in software for its configured sensor type, applies cold junction compensation from reference devices associated with each connector, and drops any input that exceeds hardware limits from the scan so a single failed sensor cannot distort the rest of the board's readings.

When the Reading Is Wrong but the Card Is Fine

Extended-range channels invite their own false alarms, and the standard ones still apply:

• Type mismatch masquerading as hardware failure. A thermocouple type configured differently from what is physically wired produces confidently wrong temperatures on a perfectly healthy card. Confirm sensor type per channel against the configuration before any hardware conclusion — especially on a board chosen specifically for the less common types.
• Sensor-end degradation. High-temperature thermocouple service is hard on sensors; an erratic or dropped channel is a sensor lead until the loop measures good at the TBTC block (polarity correct, loop resistance inside the documented 450-ohm limit).
• Cable-boundary failures. The 24 channels arrive over two cables; a failure pattern that splits along the J3/J4 boundary is a cable or connector event, not a card event.
• Uniform offsets. Cold junction compensation errors shift readings degree-for-degree. Two reference devices serve the card, one per connector, and documented logic averages them when both are in limits — diagnostics will show a reference out of limits before you need to guess.
• One control section out of step. In redundant systems, compare the same channel across sections before condemning hardware — agreement between two sections isolates the third's card or cabling.

H2 vs H1: Why the Group Digit Matters Here

Decode IS200VTCCH2CBD as IS200 series, VTCC function, hardware group H2, functional revision C, manufacturing revision BD. On many Speedtronic boards the group digit records a minor build difference; on the VTCC it defines what you can measure, so treat H1 and H2 as different parts, not neighbors. Order the group your system configuration actually requires: if your channels are all E/J/K/S/T within the standard span, the H1 card is the documented fit; if type B, N, or R sensors or extended millivolt ranges appear in your I/O list, that is precisely what the H2 group exists for. Uncertain? Send us your label string and sensor list together — and see the GE Speedtronic Part Number Decoder for how these fields work across the whole IS200 line.

System Context: TBTC Wiring and TMR Voting

The VTCC always reads through a terminal board. The TBTC carries the field terminations — grounded or ungrounded thermocouples, runs documented to 300 m (984 ft), high-frequency noise suppression, and on-board cold junction devices — and it ships in simplex and TMR versions. In TMR systems, the terminal board fans identical sensor signals to the <R>, <S>, and <T> racks so each section's card measures the same physical inputs, and documentation notes the TMR terminal board carries six cold junction references to serve the three paths. The same termination concept continues into Mark VIe, where an IS220PTCC I/O pack takes over the card's role. Platform history is covered in Mark V vs Mark VI: DS200 to IS200, and sibling hardware is cataloged under GE Mark VI IS200 Boards.

Quote Checklist for IS200VTCCH2CBD

• Full part number with suffix and revision — for this unit, IS200VTCCH2CBD — plus a label photo
• Your thermocouple type list (the H1/H2 question in one line)
• Turbine model, Mark generation, simplex or TMR
• Quantity, required condition, and delivery urgency

Send Your RFQ — Response Inside 24 Hours

This IS200VTCCH2CBD is offered as new surplus factory package stock with the warranty shown in the table below. Use the Request a Quote button; our team replies within 24 hours, ships worldwide on DDP terms, and works from your purchase order.

General Information about the Product
Part Number	IS200VTCCH2C Mark VI IS200
Description	IS200VTCCH2C By General Electric IS200VTCCH2CBD Thermocouple Card NSFP
Condition	newSurplusFactoryPackage With 1 Year Warranty.