GE IS200STTCH2A – Thermocouple Terminal Board for Mark VI/VIe Temperature Inputs

The GE IS200STTCH2A is a thermocouple termination board designed for Mark VI/Mark VIe systems. From my experience, it’s the go-to field interface when you need stable, low-noise temperature acquisition from multiple thermocouples in a turbine or balance-of-plant cabinet. It provides cold-junction compensation, robust screw terminals, and a clean hand-off to the controller-side I/O, which in many cases keeps commissioning fast and repeatable.

Order Placement Process & Guarantees

• Warranty: 365 days
• Lead time: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• High‑density thermocouple termination – Typically accommodates a multi-point temperature array, ideal for turbine exhaust, bearing metal, or HRSG inlets.
• On-board cold-junction compensation (CJC) – Helps stabilize readings across cabinet temperature changes, which you might notice reduces drift between shutdowns and startups.
• Wide thermocouple type support – Common types (J, K, T, E, R, S, B, N) are typically supported across Mark VI/VIe deployments.
• Low-noise signal path – Filtering and solid grounding help cut down on EMI that often creeps in from long sensor runs.
• Rugged field wiring – Barrier/screw terminals with clear polarity, making on-site swaps and loop checks straightforward.
• Direct interface to GE control I/O – Board-edge connectors hand off signals to the corresponding thermocouple processing module; no field-side electronics to power.
• Suited for simplex or redundant architectures – In many cases installed alongside redundant I/O to support TMR strategies.

Technical Specifications

Related / Supporting Products

• GE IS200STTCH1A – Earlier revision of the STTC thermocouple terminal board; similar function with hardware differences.
• GE IS200TTURH1x – Thermocouple processing module that interfaces with STTC boards to digitize and condition TC signals.
• GE IS200STCIH2A – Contact Input terminal board; useful when combining temperature with digital status points in the same cabinet.
• GE IS200STCOH2A – Contact Output terminal board for driving relays/actuators alongside temperature monitoring.

Installation & Maintenance

One thing I appreciate is how predictable installation is when basic cabinet practices are followed. For best results:

• Cabinet & layout: Install in a clean, dry, ventilated enclosure; allow finger space for thermocouple routing and strain relief.
• Wiring: Use thermocouple-grade cable matching the sensor type; maintain polarity; keep junctions consistent to avoid parasitic thermocouples. Route away from VFD outputs and high-current conductors.
• Shielding & grounding: Terminate shields at one end only (typically cabinet end). Bond the board ground as per GE control grounding guidelines.
• Commissioning: Verify type selection and scaling in the controller. Perform a few-point check against a reference to confirm CJC behavior.
• Routine maintenance: Re-torque terminal screws during outages, inspect for corrosion on terminals, and review trending for sensor drift. Firmware updates apply to the controller/I/O module rather than this passive board.
• Safety: De-energize and tag out before wiring. Avoid mixing dissimilar metals at terminal points.

Quality & Certifications

• Certifications: Typically conforms to CE and UL/CSA industrial control standards; RoHS compliance is common on later revisions.
• Manufacturing quality: Produced under ISO 9001 quality systems.
• Warranty: 365 days replacement/repair coverage as stated above.

Typical customer feedback: “After moving our exhaust TCs onto the IS200STTCH2A, the noise we saw during load ramps dropped noticeably. We didn’t change the sensors—just cleaned up the terminations and followed the shielding recommendations.”