GE IS200SRTDH1A Mark VIe | New Surplus Stock

Description

Product Introduction

RTDs are the backbone of turbine temperature monitoring—bearing temperatures, exhaust temperatures, inlet air temperatures, coolant temperatures. The GE IS200SRTDH1A gives you eight isolated RTD inputs with 3-wire and 4-wire capability, 16-bit resolution, and built-in lead resistance compensation. It’s the dedicated RTD input module for the Mark VIe system, delivering accurate temperature readings from Pt100 sensors.

The “SRTD” designation tells you this is an RTD input module. The “H1A” is the base revision. The module has eight isolated RTD inputs that support 3-wire and 4-wire Pt100 sensors. It has 16-bit resolution and ±0.1% accuracy. The module also has programmable temperature ranges and built-in lead resistance compensation for long cable runs. All inputs are isolated to 2,500 V.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The SRTDH1A is an RTD input module—our 26-point inspection verifies temperature accuracy, lead resistance compensation, and isolation.

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 “–SRTDH1A” clearly.

Visual Inspection. Magnifying lamp, full board scan. The RTD input circuits (excitation current sources, amplifiers) are inspected for rework. The 96-pin backplane connector shows zero wear.

Live Functional Test. Mark VIe test rack with an RTD simulator (precision resistance decade box) and a reference thermometer.

• Accuracy test: Simulate 0 °C (100 Ω), 100 °C (138.5 Ω), and 200 °C (175.8 Ω)—verify the module’s temperature reading matches within ±0.1%.
• 3-wire test: Simulate a 3-wire RTD with lead resistance—verify the module compensates correctly.
• 4-wire test: Simulate a 4-wire RTD—verify accuracy.
• Temperature range test: Verify the module reads across the full –200 to +850 °C range.
• Isolation test: 2,500 V RMS—no breakdown.
• 24-hour soak: All inputs at 100 °C—log drift.

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, lead resistance compensation, isolation test, and a photo.

Field Replacement Pitfalls

The SRTDH1A is an RTD input module—installation mistakes are usually about wiring and lead resistance.

Wiring—3-wire vs. 4-wire. The module supports both 3-wire and 4-wire RTDs. Use the correct wiring scheme. One site in Texas wired a 3-wire RTD to a 4-wire input—the module didn’t read correctly.

Lead Resistance Compensation—Enable It. The module has built-in lead resistance compensation. If you disable it, the reading will be off by the resistance of the lead wires (typically 0.1 °C per foot). One site in Ohio disabled it and wondered why the temperature was 5 °C low.

Excitation Current—1 mA is Fixed. The module uses a fixed 1 mA excitation current. This is fine for Pt100 sensors. Do not use the module with 100 Ω sensors that require higher current.

RTD Simulator—Use a Decade Box. For testing, use a precision resistance decade box. A simple resistor won’t provide the accuracy needed to verify the module.

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

New Original vs. Refurbished: Why It Matters

The SRTDH1A has precision input circuits—refurbishers often can’t verify the ±0.1% accuracy.

What “New Original (New Surplus)” means. This IS200SRTDH1A came from GE’s factory, never mounted. The input circuits are factory-calibrated. We break the seal only for testing.

Refurbished risk in plain terms. The input amplifiers can drift with age. A refurbished SRTDH1A may have drifted accuracy—the reading could be off by 1 °C. I’ve tested refurbished SRTDH1A units where the accuracy was 0.5% instead of 0.1%. Failure rate on refurbished RTD input modules runs 4× higher than new.

Real cost of a refurbished failure. A bearing temperature is off by 5 °C—the turbine runs too hot—bearing wear accelerates—bearing failure—100,000. The refurbished module saved you 800. The failure cost you 125× that.

What we provide as proof. For every IS200SRTDH1A we ship: a photo of the OEM packing slip, serial traceability to GE’s records, a full test report that includes temperature accuracy, lead resistance compensation, isolation test, 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 RTD accuracy testing, and a 12-month warranty.

Performance Benchmarks & Test Results

Data from our Mark VIe test rack (ambient 45 °C, supply +5.0 VDC, ToolboxST v5.3, RTD simulator, reference thermometer, hi-pot tester).

• Temperature accuracy—0 °C: Reading 0.0 °C—within ±0.1%.
• Temperature accuracy—100 °C: Reading 100.1 °C—within ±0.1%.
• Temperature accuracy—200 °C: Reading 199.9 °C—within ±0.1%.
• 3-wire lead compensation: 10 Ω lead resistance—reading compensated correctly.
• 4-wire lead compensation: 10 Ω lead resistance—reading compensated correctly.
• Isolation test: 2,500 V RMS—no breakdown. Insulation resistance >100 MΩ.
• Thermal performance: At 60 °C ambient, the module ran at 52 °C—under the 85 °C rating.
• Reliability estimate: MIL-HDBK-217F gives a demonstrated MTBF of 65,000 hours at 40 °C—that’s 7.4 years.

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