IS200STAIH2ACB I/O Pack | 16 TC Inputs, Extended Temp

Description

Product Introduction

The IS200STAIH2ACB combines high density with extended-temperature performance—16 thermocouple inputs in a single slot, rated for –40 to +70 °C operation. If your turbine has dozens of exhaust thermocouples in an outdoor cabinet, this module saves rack space and keeps the readings accurate when the mercury drops.

The “ACB” suffix tells you this is the high-density (H2) version with extended-temperature (A) and enhanced cold-junction compensation (CB). The input amplifiers are cold-rated parts that maintain their gain and offset 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 rest is the same: 16 TC inputs, programmable TC types, 16-bit resolution.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The STAIH2ACB gets the thermal chamber treatment—our 32-point inspection includes accuracy 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 “–STAIH2ACB” 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, and Tenney chamber.

• Cold soak (4 hours at –40 °C): 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 must hold.
• Cold-junction compensation test at extremes: Verify CJC corrects for ambient temperature changes.
• Crosstalk test at extremes: Verify <0.05% crosstalk.
• 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 temperature accuracy on all 16 channels at extremes, CJC test, crosstalk, isolation test, thermal cycle log, and a photo.

Field Replacement Pitfalls

The STAIH2ACB handles temperature extremes and high density—installation mistakes are similar to the standard versions.

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. The CJC sensor is on the terminal block. Keep the terminal block at ambient temperature.

Crosstalk—Adjacent Channels. The high-density design can have minimal crosstalk—<0.05%. If you have a large temperature difference between adjacent channels, the reading might be off by a small amount. Negligible.

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

Cold Temperature CJC Accuracy—The “ACB” Holds Accuracy. The cold-rated sensor is accurate at –40 °C. But if the terminal block has condensation, the CJC could be affected. Keep the block dry.

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

New Original vs. Refurbished: Why It Matters

The STAIH2ACB has 16 cold-rated input circuits and conformal coating—refurbishers can’t add these.

What “New Original (New Surplus)” means. This IS200STAIH2ACB came from GE’s factory with the cold-rated 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 “ACB.” At –40 °C, the standard amplifiers drift and the CJC is inaccurate. I’ve tested refurbished “ACB” units that were actually standard STAIH2As—they failed the cold soak accuracy test. Failure rate on refurbished extended-temp high-density TC modules runs 5× higher than new.

Real cost of a refurbished failure. An exhaust temperature reading is off by 5 °C on channel 12 at –35 °C—the turbine control system limits output—lost generation—30,000. The refurbished module saved you 1,100. The failure cost you 27× that.

What we provide as proof. For every IS200STAIH2ACB we ship: a photo of the OEM packing slip, serial traceability to GE’s records, a full test report that includes temperature accuracy on all 16 channels at –40 °C and +70 °C, CJC test, crosstalk, 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-density TC testing, and a 12-month warranty.

Performance Benchmarks & Test Results

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

• 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.
• Crosstalk: <0.05%—within spec.
• 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 52,000 hours at 40 °C—that’s 5.9 years.

MOTOROLA VME172PA652SE PLC
TRICONEX 3721 PLC
ABB PM511V08 PLC
Johnson MS-NAE5510-3 PLC