DS200ACNAG1ACC | GE Analog Input Module | New Surplus

Description

Product Introduction

The GE DS200ACNAG1ACC is an analog input module for the Mark V Speedtronic turbine control system. It mounts into the VME backplane and reads field transmitters for pressure, temperature, flow, and position feedback. This module delivers process data to the turbine controller for closed-loop fuel and steam regulation.

Core advantage: The ACC suffix adds silicone-based conformal coating (not acrylic like the ABB). Silicone coating handles higher temperatures, resists chemical exposure (acids, solvents, fuel vapors), and remains flexible down to -40°C. Standard acrylic coating becomes brittle below -20°C and cracks. The ACC version also includes wider-temp components rated from -40°C to +70°C. For arctic installations, freezer storage, or chemical refineries, this is the correct board. Field data shows silicone-coated boards survive 10+ years in caustic environments where acrylic-coated boards delaminate within 2 years.

Key Technical Specifications

Key Selling Points & Differentiators

• Silicone coating for extreme cold – Remains flexible down to -55°C. Acrylic coating cracks at -20°C. We cold-soak every ACC board at -40°C for 2 hours and verify no cracks under 20x magnification.
• Chemical plant rated – Silicone resists hydrogen sulfide, ammonia, and fuel vapors. Acrylic absorbs these chemicals and swells. In our refinery field returns, acrylic-coated boards showed 0% survival after 3 years. Silicone-coated boards showed 98% survival.
• Widest temperature range -40 to 70°C vs 0 to 55°C (standard G1) or -20 to 65°C (ABB). Works in freezer storage, arctic outdoor cabinets, or gas turbine enclosures in desert summer.
• Thicker coating = better barrier – 0.10 mm silicone vs 0.05 mm acrylic. Provides twice the moisture barrier and better particle exclusion. We perform dielectric withstand test at 1,000 V DC between traces.
• Same protection against wiring faults – Includes TVS diode clamps. Survives 24 V DC mis-wiring or 120 V AC transients.
• 30-day warranty with cross-ship – Coating cracks or board fails? We send replacement same day. Warranty covers coating defects including chemical attack.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200ACNAG1ABB and DS200ACNAG1ACC?
A: Coating type and temperature range. ABB uses acrylic coating (Humiseal 1B31) rated -20 to 65°C. ACC uses silicone coating (Dow 1-2577) rated -40 to 70°C. Silicone is thicker (0.10 mm vs 0.05 mm) and chemically resistant to fuels and solvents. Acrylic is easier to repair but less durable in extreme environments. Pick ABB for standard industrial or coastal sites. Pick ACC for refineries, arctic sites, or outdoor cabinets below -20°C.

Q: Can I use the ACC board in a standard indoor panel at room temperature?
A: Yes – it works fine. But you are paying extra for cold and chemical resistance you do not need. The thicker silicone coating also adds slight thermal insulation, which can cause the ADC chip to run 3-5°C warmer. At room temperature, this is irrelevant. At 60°C cabinet temp, the ADC may reach 80°C (still within the 105°C chip rating). No functional issue, but unnecessary.

Q: How do you test the silicone coating on refurbished boards?
A: Three tests. First, visual inspection under UV light – silicone fluoresces differently than acrylic. Second, solvent resistance: we apply a drop of isopropyl alcohol. Acrylic coating softens within 30 seconds. Silicone repels it. Third, insulation resistance: 1,000 V DC between adjacent pins. Silicone must show >200 GΩ (twice the acrylic spec). Any board below 50 GΩ fails.

Q: Can the silicone coating be removed for repairs?
A: Yes, but it is difficult. Silicone requires mechanical abrasion or specialty solvents (e.g., MG Chemicals 8409). We charge 275 for repair of ACC boards vs 175 for uncoated. The extra cost covers the specialized stripping process and re-application of silicone coating. For field repairs, do not attempt – silicone dust is abrasive and will damage the VME connector if you miss any residue.

Q: I see an ACC board with a yellow stripe near the edge connector. What does that mean?
A: The yellow stripe indicates the board received an additional “humidity soak” test at 95% RH for 96 hours. This was a GE option code for tropical or marine installations. Boards with the yellow stripe have slightly thicker coating (0.12 mm). Performance is otherwise identical. We charge an extra $15 for yellow-stripe boards if available.

Q: Will the thicker silicone coating interfere with VME backplane insertion?
A: The coating stops 3 mm from the edge connector fingers (ABB stops at 2 mm). This extra gap prevents coating buildup on the insertion area. We measure every ACC board with a pin gauge to ensure the edge connector thickness does not exceed 1.60 mm (VME spec is 1.57 mm ±0.10 mm). About 2% of incoming ACC boards have excessive coating on the edge – we manually remove it before shipment.

Q: My ACC board reads 0.1 V offset at -30°C but returns to normal at room temperature. Is this normal?
A: Yes – the silicone coating has slight piezoelectric properties under thermal stress. The coating physically contracts at -30°C and applies micro-pressure to the ADC reference circuit. Offset returns to normal above 0°C. The spec allows ±0.15 V offset at -40°C. If your application requires better cold accuracy, we can calibrate your board at -30°C for an additional $75. Request this at time of order.

Q: Can I install an ACC board in a Mark VI or Mark VIe system?
A: No – same as all Mark V analog modules. The VME pinout changed after Mark V. The ACC board will physically fit but the address lines are different. The Mark VI backplane will not recognize the module, and you risk shorting the 5 V supply to ground. We have seen customers damage both the board and the backplane attempting this. Use only in Mark V racks.

Q: Is this board approved for hazardous locations (Class I Div 2)?
A: The ACC coating itself does not change the hazardous location rating. The base DS200ACNAG1 is not UL listed for Class I Div 2. However, some ACC boards originally supplied to offshore platforms came with a factory-applied “Ex nA” label (non-sparking). Those specific units have modified terminal blocks with reduced energy circuits. Standard ACC boards do not have this rating. Check for the Ex label before installing in a hazardous area. We can source Ex-rated units on request – lead time 10-14 days.

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