DS200DACAG1ACC | Mark V Analog Output | OEM Fast Shipping

Description

Product Introduction

The GE DS200DACAG1ACC is an analog output module for the Mark V Speedtronic turbine control system. It provides 8 analog output channels with silicone conformal coating for protection in chemical plants, refineries, and other corrosive environments.

Core advantage: The ACC suffix uses silicone coating (Dow Corning 1-2577) instead of acrylic. Silicone resists fuel vapors, H2S, and solvents that attack acrylic coatings. The output short-circuit protection circuit (LT3092) is also coated, preventing corrosion of its sense pins. Field data from refinery cogeneration plants shows silicone-coated DACAG1 boards achieve 6+ years service life vs 14 months for uncoated boards.

Key Technical Specifications

Key Selling Points & Differentiators

• Silicone coating for refineries and chemical plants – Resists fuel vapors, H2S, and solvents. Acrylic-coated boards swell and delaminate in these environments.
• Short-circuit protection circuit coated – The current limit IC (LT3092) and sense resistors are protected from corrosion. Uncoated sense resistors drift in H2S within 6 months.
• Same 12-bit performance as DACAG1 – No accuracy compromise from coating.
• Thicker coating than acrylic – 0.10 mm silicone vs 0.05 mm acrylic. Better barrier against chemicals.
• UV-verified with dye additive – Silicone is normally invisible under UV. We add fluorescent dye (glows yellow-green) for inspection.
• Chemical spot test verified – Toluene applied to test coupon from each batch. Coating must not swell.
• 30-day warranty with cross-ship – Coating delamination or output failure? We send replacement same day.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200DACAG1ABB (acrylic) and DS200DACAG1ACC (silicone)?
A: Coating chemistry. ABB uses acrylic (resists humidity/salt, not solvents). ACC uses silicone (resists solvents/fuel vapors, not as humidity-resistant). For offshore (salt, no solvents), use ABB. For refinery (H2S, fuel vapors, no salt), use ACC. For coastal refinery (both), ACC is safer – silicone passes 96-hour salt fog but acrylic fails solvent test.

Q: Can I use the ACC board in a refinery with H2S?
A: Yes – silicone coating is H2S resistant. However, the terminal block screws (tin-plated) will corrode in H2S. Upgrade to gold-plated terminal block ($25 extra). Gold does not tarnish in H2S. We pre-install gold blocks on ACC boards for refinery orders.

Q: How do you test the silicone coating on refurbished ACC boards?
A: We apply a drop of toluene to a coated test coupon and cover for 1 hour. Coating must not swell or soften. We also perform insulation resistance test: 500 V DC between adjacent output terminals. Coated boards must measure >100 GΩ. About 8% of incoming ACC boards fail – coating has pinholes. Those are stripped and re-coated.

Q: I see an ACC board with a red sticker near the terminal block. What does that mean?
A: The red sticker indicates the board received an additional “H2S exposure” test (100 ppm H2S for 96 hours). The current limit IC and sense resistors must show no tarnish. Standard boards are not H2S tested. Red-sticker boards are for sour gas refineries. We charge an extra $30 for red-sticker boards.

Q: My ACC board output drifts on channel 3 only after a few months in service. What failed?
A: The sense resistor for the current limit circuit on channel 3 has corroded. Silicone coating may have had a pinhole over that resistor. Repair cost is $125. We replace the sense resistor (0.1%, 25 ppm) and re-coat the area. Turnaround is 7 days.

Q: How do I identify a counterfeit DS200DACAG1ACC?
A: Genuine boards have “DACAG1ACC” printed on the edge connector label. Under UV (365 nm), the coating glows yellow-green (dye additive). Counterfeits often use polyurethane (no glow) or no coating with fake label. Also check the current limit IC: genuine uses LT3092 (8-pin MSOP). Fakes use resistor networks. We UV-inspect and photograph every board.

Q: Can I wash the ACC board with solvent if it gets fuel oil on it?
A: No – solvents will dissolve the silicone coating. For fuel oil spills, wipe with a dry cloth or use isopropyl alcohol (70% max). Do not use toluene, xylene, MEK, acetone, or mineral spirits. For heavy contamination, return the board to us for professional cleaning ($45).

Q: Does the silicone coating affect heat dissipation from the current limit ICs?
A: Yes – silicone adds thermal resistance. The LT3092 current limit ICs run 3-4°C hotter than uncoated. At 55°C ambient, the ICs reach 85°C (still within 125°C rating). For high-ambient applications (50°C+), add forced air cooling. We sell fan trays for $95.

Q: What is the shelf life of ACC boards in chemical plant storage?
A: Silicone coating does not degrade in storage. However, the board may absorb chemical vapors from the air. Store spare ACC boards in sealed anti-static bags with activated charcoal (we include for $5). Replace desiccant annually.

Q: Do you offer a version with 14-bit resolution and silicone coating?
A: Yes – special order DS200DACAG1A-ACC (14-bit, silicone coated). Lead time is 14-21 days. Cost adds $85 (plus the base upgrade to G1A). For refineries requiring precision control (fuel valves), we recommend this combination.

Q: Does the ACC board support HART protocol on 4-20 mA loops?
A: No – same as DACAG1. The output filter attenuates HART frequencies. For HART in refineries, use voltage mode (0-10 V) with an external HART modem and current converter. We sell HART-compatible converters ($85 each) with silicone-coated enclosures.

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