DS200ADPBG1ABB | GE Speedtronic Module | In Stock

Description

Product Introduction

The GE DS200ADPBG1ABB is a dedicated bridge sensor input module for the Mark V Speedtronic turbine control system. It is designed for strain gauges, load cells, and pressure transducers in high-humidity or corrosive environments. This module adds acrylic conformal coating to the ADPBG1A platform.

Core advantage: The ABB suffix protects the high-impedance bridge inputs (100 MΩ) from moisture-induced leakage currents. Uncoated ADPBG1A boards in offshore or coastal installations develop input leakage after 12-18 months, causing false strain readings of 50-100 micro-strain. Coated boards show no leakage after 5+ years. The coating also protects the precision excitation supply (0.01% accuracy) from corrosion. Field data from offshore platforms shows coated ADPBG1A boards have 95% lower failure rate than uncoated.

Key Technical Specifications

Key Selling Points & Differentiators

• Acrylic coating stops bridge input leakage – High-impedance (100 MΩ) bridge inputs are sensitive to moisture. Uncoated boards develop 50-200 pA leakage in humid environments, causing 50-200 micro-strain offset error at 10 V excitation. Coated boards stay below 1 pA.
• Protects precision excitation supply – The 0.01% excitation reference (ADR421) is coated, preventing corrosion of its pins. Uncoated boards in salt fog environments show reference drift after 2 years.
• Same ratio metric 18-bit performance – No accuracy compromise from coating. 0.5 µV noise floor, 0.02% linearity. Coating does not affect bridge measurement.
• UV-verified coating integrity – Acrylic coating fluoresces blue-green under UV light. We inspect every board for pinholes, especially around the excitation terminals.
• Designed for offshore and coastal – ABB suffix is standard for GE boards supplied to offshore platforms (North Sea, Gulf of Mexico). Resists salt fog and high humidity.
• 30-day warranty with cross-ship – Coating defect or leakage current out of spec? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200ADPBG1A and DS200ADPBG1ABB?
A: Conformal coating only. ADPBG1ABB has acrylic coating (0.05 mm) over all components. ADPBG1A is uncoated. Electrical specifications are identical. The ABB suffix is mandatory for offshore platforms, coastal power plants, and paper mills. For clean, climate-controlled control rooms (e.g., gas turbine enclosure with HVAC), ADPBG1A is sufficient.

Q: Can I field-coat my existing ADPBG1A board?
A: We strongly advise against it. The bridge inputs are extremely high impedance (100 MΩ). Field-applied coating often has pinholes or contaminants that create worse leakage than no coating. The excitation reference (ADR421) is sensitive to coating thickness. Send us your board for professional coating ($75 per board). We strip, clean with ultrasonic, dry in vacuum oven, apply coating in cleanroom, and cure for 24 hours.

Q: How do you test the coated board for leakage current?
A: We place the board in a humidity chamber at 95% RH, 40°C for 24 hours. Then we measure leakage current between adjacent input terminals at 10 V DC. Uncoated boards measure 50-200 pA. Coated ABB boards must measure <1 pA. Any board showing >5 pA fails – the coating has pinholes. About 10% of incoming ABB boards fail. Those are stripped and re-coated.

Q: I see an ABB board with a red dot near the excitation jumper. What does that mean?
A: The red dot indicates the board received an additional “salt fog” test per ASTM B117 for 96 hours (4x standard). Boards that pass show no corrosion on any metal surface, including the terminal block screws and edge connector fingers. Standard ABB boards are not salt fog tested. We charge an extra $40 for red-dot boards. For offshore platforms within 1 mile of salt water, we recommend red-dot.

Q: My coated ADPBG1ABB reads fine at room temperature but drifts at 50°C. What failed?
A: The coating may be trapping heat around the excitation reference. Acrylic coating has low thermal conductivity. The ADR421 reference normally drifts 3 ppm/°C. With coating, the local temperature rise can add 2 ppm/°C of apparent drift. We have seen this on boards with excessively thick coating (>0.10 mm). Return the board for inspection. We will strip and re-coat to correct thickness (0.05 mm) at no charge under warranty.

Q: Does the coating affect the 6-wire sense capability?
A: No – the sense lines (sense+ and sense-) are terminated on the terminal block outside the coated area. The coating stops 3 mm from the terminal block pins. The sense inputs remain accessible and unaffected. However, the terminal block itself is not coated. If you need corrosion protection on the terminal block screws, we offer gold-plated terminal blocks ($25 each). Standard blocks are tin-plated.

Q: How do I identify a counterfeit DS200ADPBG1ABB?
A: Genuine boards have “ADPBG1ABB” printed on the edge connector label. Under UV light (365 nm), the coating fluoresces blue-green. Counterfeit boards often use polyurethane coating (no fluorescence) or no coating with a fake “ABB” label. Also check the excitation reference: genuine uses ADR421 (2.5 V, 0.04% accuracy). Fakes use LM4040 (0.5% accuracy). We UV-inspect and photograph every board.

Q: Can the coating be removed for repairs?
A: Yes – acrylic coating can be removed with Chemtronics AC-70 solvent. We offer repair services for coated boards at 245 (vs 195 for uncoated). The extra cost covers coating removal, ultrasonic cleaning, and re-application. For field repairs, do not attempt – the solvent will damage the terminal block and may wick under the ADC chip. Send the board to us.

Q: Does the ABB coating affect the update rate or resolution?
A: No – coating is purely passive. Update rate remains 60 ms for 4 channels. Resolution remains 18-bit (0.5 µV noise floor). The only affected parameter is thermal dissipation (board runs 2-3°C warmer). At full load (475 mA), coated board surface temperature is 58°C vs 55°C uncoated – still within 0-55°C ambient spec.

Q: What is the shelf life of coated ABB boards in storage?
A: Acrylic coating does not degrade in storage if kept in anti-static bags at 10-40°C. We have shipped boards stored for 6 years with no coating issues. However, the terminal block springs may relax over time. We include new terminal blocks with each order – the original block may have oxidized contacts. Replace the terminal block before installation. Gold-plated blocks (recommended for coastal) have unlimited shelf life.

Q: Do you offer the ADPBG1A with auto-zero and conformal coating?
A: No – GE never manufactured an ADPBG1A with auto-zero. The bridge inputs are inherently stable (0.5 µV noise floor, 0.5 µV/°C drift). Auto-zero would add relay noise and wear. For applications requiring drift below 0.1 µV/°C, use an external chopper-stabilized amplifier (e.g., Analog Devices ADA4528) before the ADPBG1A inputs. We can supply pre-amplifier boards for $125 per channel.

Q: Is this board compatible with 120 Ω quarter-bridge strain gauges in high humidity?
A: Yes – but the completion resistors (onboard 120 Ω) are also coated. Their temperature coefficient is ±5 ppm/°C. In high humidity, the coating prevents moisture absorption, which would otherwise change resistor value. Uncoated 120 Ω resistors absorb moisture and drift by 50 ppm. Coated resistors stay stable. For long-term accuracy in humid environments, the ABB coating is essential for quarter-bridge applications.

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