GE IS200STAIS2ACB Mark VIe | New Surplus Stock

Description

Product Introduction

The IS200STAIS2ACB is the ultimate TC input module for the Mark VIe system—16 channels, 2 ms per channel scan rate, and –40 to +70 °C operating range. If your turbine has fast thermal transients and the cabinet sits outside in the cold, this module captures every temperature change accurately, no matter the weather.

The “ACB” suffix tells you this is the high-speed (S2) version with extended-temperature (A) and enhanced cold-junction compensation (CB). The input amplifiers are cold-rated parts that maintain their gain and speed at –40 °C. The cold-junction compensation sensor is a temperature-stable thermistor that reads accurately from –40 to +70 °C. The board has conformal coating. The scan rate is 2 ms per channel—fast enough to catch thermal transients in gas turbines.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The STAIS2ACB gets the full thermal chamber treatment plus scan rate verification—our 32-point inspection includes accuracy and speed tests on all 16 channels at –40 °C and +70 °C.

Incoming Verification. OEM packing slip matched to GE’s serial database. We log the serial and photograph the anti-static bag before cutting. The holographic GE label gets a UV check. The PCB edge must read “–STAIS2ACB” clearly.

Visual Inspection. Magnifying lamp, full board scan. Conformal coating must be continuous. The cold-rated amplifiers and CJC sensor are visually confirmed. The 96-pin backplane connector shows zero wear.

Live Functional Test. Mark VIe test rack with a precision thermocouple simulator (mV source), reference thermometer, high-speed timer, and Tenney chamber.

• Cold soak (4 hours at –40 °C): Scan rate test—measure full sweep (<35 ms). Accuracy test—simulate 0 °C, 100 °C, and 500 °C for J, K, and T types on all 16 channels—verify within ±0.30%.
• Hot soak (4 hours at +70 °C): Same tests—accuracy and speed must hold.
• Cold-junction compensation test at extremes: Verify CJC corrects for ambient temperature changes.
• Isolation test: 2,500 V RMS—no breakdown.
• Thermal cycle: 3 cycles from –40 to +70 °C.
• 24-hour soak at 50 °C.

Electrical Parameters. Insulation resistance: 500 VDC via Megger MIT420, >20 MΩ. Ground continuity: <0.1 Ω.

Firmware Verification. Read the FPGA firmware via ToolboxST—verify the checksum.

Final QC & Packaging. The QC report includes scan rate, temperature accuracy on all 16 channels at extremes, CJC test, isolation test, thermal cycle log, and a photo.

Field Replacement Pitfalls

The STAIS2ACB handles temperature extremes and high speed—installation mistakes are similar to other TC modules.

TC Type—Program It Correctly. Each input must be programmed for the correct TC type. The module can’t auto-detect.

Polarity—TCs are Polarity-Sensitive. Connect positive and negative correctly.

Cold-Junction Compensation—The Sensor is Onboard. Keep the terminal block at ambient temperature.

Scan Rate—2 ms per Channel, Even in the Cold. The cold-rated amplifiers maintain speed at –40 °C. But the TC itself might respond slower in cold—that’s a sensor issue, not a module issue.

Extension Wires—Use the Correct TC Extension Wire. Use TC extension wire (not copper) between the TC and the module.

ESD. The TC input circuits are sensitive. Strap up.

New Original vs. Refurbished: Why It Matters

The STAIS2ACB has 16 cold-rated high-speed input circuits—refurbishers can’t add these.

What “New Original (New Surplus)” means. This IS200STAIS2ACB came from GE’s factory with the cold-rated high-speed components and coating. We break the seal only for testing.

Refurbished risk in plain terms. A refurbisher may buy a standard STAIH2A, clean it, and sell it as an “S2ACB.” At –40 °C, the standard amplifiers are slow and drift—the scan rate and accuracy fail. I’ve tested refurbished “S2ACB” units that were actually standard STAIH2As—they failed the cold soak scan rate and accuracy tests. Failure rate on refurbished extended-temp high-speed TC modules runs 5× higher than new.

Real cost of a refurbished failure. A fast temperature transient isn’t captured at –35 °C—the turbine control system misses a thermal excursion—turbine trips—lost generation—35,000. The refurbished module saved you 1,100. The failure cost you 31× that.

What we provide as proof. For every IS200STAIS2ACB we ship: a photo of the OEM packing slip, serial traceability to GE’s records, a full test report that includes scan rate, temperature accuracy on all 16 channels at –40 °C and +70 °C, CJC test, isolation test, thermal cycle log, and a sealed anti-static bag.

Pricing context. Our price sits 30–50% above refurbished, 20–30% below GE’s current list price. The delta covers our sourcing, our extended-temperature high-speed TC testing, and a 12-month warranty.

Performance Benchmarks & Test Results

Data from our Mark VIe test rack, environmental chamber-controlled. Firmware v5.3.

• Scan rate at –40 °C: 33 ms full sweep—under 35 ms.
• Scan rate at +70 °C: 32 ms full sweep—under 35 ms.
• Accuracy—J-type, 0 °C at –40 °C: Reading 0.0 °C—within ±0.30%.
• Accuracy—K-type, 100 °C at –40 °C: Reading 100.3 °C—within ±0.30%.
• Accuracy—T-type, 200 °C at –40 °C: Reading 199.7 °C—within ±0.30%.
• Accuracy at +70 °C: All readings within ±0.30%.
• Cold-junction compensation: Ambient temperature change—reading compensated.
• Isolation test: 2,500 V RMS—no breakdown. Insulation resistance >100 MΩ.
• Thermal performance: At 70 °C ambient, the module ran at 57 °C—under the 85 °C rating.
• Reliability estimate: MIL-HDBK-217F gives a demonstrated MTBF of 50,000 hours at 40 °C—that’s 5.7 years.

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