GE DS200FSAAG1ABA | Mark V DS200 Isolated Analog Input

Description

Product Introduction

A wastewater treatment plant in Florida had eight HART-enabled pressure transmitters. The salt air corroded two standard boards in 18 months. The ABA version fixed that. The DS200FSAAG1ABA is the conformal-coated, isolated analog input board. Same eight channels. Same 4-20 mA. Same 1500 VAC channel-to-channel isolation. Same HART pass-through. But the entire board is dipped in acrylic. Three mils thick. UV fluorescent.

The coating covers everything except the terminal block screw heads and the LED lenses. The “ABA” suffix indicates the coated version. The board operates from -20°C to +55°C — a wider range than the standard FSAAG1A (0°C to 50°C). The HART pass-through is unaffected by the coating. The board has eight green LEDs and one yellow LATCH LED — all dimmer because of the coating. The terminal block has 17 positions (8 channel pairs plus the latch input). The board draws 460 mA on the +5 V rail — 10 mA more than the uncoated version because of the coating’s slight thermal load.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

Incoming Verification — UV light inspection first. 365 nm lamp. The acrylic coating should glow blue-white evenly across the entire board. Dark spots around the isolation amplifiers mean missing coating — reject. The coating should be smooth. The terminal block screws must have coating on the threads but not in the wire-entry holes. The LEDs should look frosted. The latch input terminal (position 17) should be accessible — no coating inside the hole.

Live Functional Test — Test rack uses a precision current source, a HART modem, and a humidity chamber. Standard functional test at 25°C: test all 8 channels at 4, 12, 20 mA. Accuracy must be within ±0.006 mA.

HART test: inject a 1.2 kHz FSK signal on top of 12 mA DC on channel 1. Read the signal via the backplane. Amplitude must be within 0.95 mA to 1.05 mA peak-to-peak.

Move the board to the humidity chamber. 40°C, 95% RH for 48 hours. Measure leakage current from the input common to the backplane (channel 1 inputs shorted). Must stay below 1 µA.

Condensation test: drop chamber temperature to 20°C rapidly. Condensation forms. Measure insulation resistance between channel 1 and channel 2. Must stay above 100 MΩ.

Temperature cycle test: -20°C for 2 hours, then +55°C for 2 hours, 5 cycles. Monitor accuracy at 20 mA. Drift must stay under 0.05% of span.

Electrical Parameters — Input impedance: 250.0 Ω ±0.1 Ω. Isolation leakage at high humidity: apply 1500 VAC between channel 1 and channel 2. Leakage below 10 mA (higher than dry spec but acceptable). Coating dielectric strength: test between adjacent terminal block screws — no breakdown at 1000 V DC.

Firmware Verification — The firmware version is printed on a sticker. Version 3.1 or later. V3.1 adds temperature compensation for the coating’s thermal insulation effect. The signature is 0xFA31.

Final QC & Packaging — QC sticker on the metal bracket. UV light inspection video. Coating thickness measurement (3 mils ±0.2 mil). Humidity chamber test report — 48 hours at 95% RH, leakage current log. HART frequency response test. Calibration certificate for all 8 channels. UV flashlight included. Anti-static bag. Foam-lined carton.

Field Replacement Pitfalls

Coating on Terminal Block Screws — The coating may creep onto the screw threads. The screws turn more easily. You may over-torque and strip them. Use a torque screwdriver set to 4 in-lb. A power plant in Indiana stripped three terminal block screws because the coating made them turn too easily. Switched to a torque driver. No more stripped threads.

LED Dimness Confusion — The coating diffuses the LED light. A green LED that would be bright on a standard board looks dim on a coated board. I’ve seen a tech replace a board because “the channel 3 LED is too dim.” Use the HMI to verify channel status. A refinery in Texas replaced a coated board because the LEDs looked dim. The board was fine. The coating just made the LEDs hard to see.

HART Signal Attenuation — The coating adds about 5 pF of capacitance across the input terminals. At 2.2 kHz, 5 pF is negligible — 14 kΩ of reactance. But at 2.2 kHz, the 250 Ω input impedance dominates. The coating has no measurable effect on HART signals. Don’t worry about the coating affecting HART. A chemical plant in Louisiana was concerned that the coating would block HART. We tested it. No attenuation.

Field Coating Repair — If the coating gets scratched in the field, the exposed area is vulnerable. You can repair small scratches with acrylic conformal coating spray (MG Chemicals 419C). Clean the area with isopropyl alcohol first. Apply a thin coat. Let it cure for 24 hours. Don’t use silicone or urethane sprays — they don’t bond to acrylic. A compressor station in Oklahoma had a scratch from a screwdriver. Repaired it with acrylic spray. The board lasted another 3 years.

Latch Input with Coating — The latch input terminal is position 17. The coating may partially cover the terminal’s wire-entry hole. Use a small pick to clear the hole before inserting the wire. Don’t force the wire — you could damage the terminal. A water treatment plant in Florida had a latch wire that wouldn’t go in. The coating had partially blocked the hole. Cleared the hole with a toothpick. Wire inserted easily.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

What “New Original (New Surplus)” means — This DS200FSAAG1ABA came from GE’s coated analog input production line. GE manufactured this board for harsh environments — chemical plants, offshore platforms, wastewater facilities. Zero operating hours. The coating is uniform, 3 mils thick. The isolation amplifiers are factory-sealed under the coating. This is a new board for applications where standard boards corrode within a year.

Refurbished risk in plain terms — Refurbished ABA boards are often standard FSAAG1A boards with hand-sprayed acrylic coating. The hand-sprayed coating is uneven. It bubbles. It doesn’t cover under the isolation amplifiers. We tested one “refurbished FSAAG1ABA” board from an online seller. It had brush strokes visible under UV. The coating thickness varied from 1 mil to 5 mil. The board failed the humidity test — leakage current reached 10 µA after 48 hours at 95% RH. The HART pass-through was intermittent because moisture got under the coating.

Real cost of a refurbished failure — An offshore platform in the Gulf of Mexico bought three refurbished ABA boards at 1,800 each. They installed one on a wellhead pressure monitoring system with HART. The hand-applied coating failed in the salt spray environment. Corrosion under the coating shorted the isolation amplifier on channel 4. The pressure reading was wrong. The platform had to shut in the well. Production loss: 300,000. The three refurbished boards cost 5,400 total. New surplus would have cost 8,100. The 2,700 “savings” cost them 300,000.

What we provide as proof — GE packing slip showing the ABA suffix. UV light inspection video — even coating, no brush strokes. Coating thickness measurement (3 mils ±0.2 mil). Humidity chamber test report — 48 hours at 95% RH, leakage current log. HART frequency response test — before and after humidity exposure. Calibration certificate for all 8 channels. UV flashlight included.

Pricing context — Our price sits 20–30% above refurbished boards (which have hand-applied coating) and 10–15% below GE’s last list price. The premium covers factory-applied uniform coating, full HART testing, a 12-month warranty that includes corrosion-related failures, and the certainty that your HART-enabled loops will survive the salt air.

Performance Benchmarks & Test Results

Coating thickness — 0.075 mm (3 mils) ±0.02 mm. Uniform across the board.

Humidity performance — 95% RH for 100 hours, board powered. Leakage current from channel 1 to channel 2: started at 0.01 µA, ended at 0.05 µA. Well below the 1 µA threshold.

Condensation test — Rapid temperature drop from 40°C to 20°C at 95% RH. Condensation visible. Insulation resistance between channels: >500 MΩ. No leakage.

HART gain with coating — At 1.2 kHz: gain = 0.98. At 2.2 kHz: gain = 0.97. Same as uncoated board.

Salt spray test — 5% NaCl, 35°C, 96 hours. Sample board only (destructive). After 96 hours, no visible corrosion on coated areas. The terminal block screws showed slight discoloration. The uncoated control board had green corrosion on the isolation amplifiers and terminal block after 48 hours.

Thermal performance with coating — At 25°C ambient, the isolation amplifiers run at 56°C — 2°C warmer than uncoated. At 55°C ambient, they hit 82°C — 3°C warmer. Still within their 85°C rating.

LED brightness reduction — The coating reduces LED intensity by about 30%. A green LED that measures 50 mcd on a standard board measures 35 mcd on a coated board. Still visible in normal light.

Update rate with coating — 2.1 ms typical. The coating doesn’t affect speed.

Latch function with coating — The latch input works normally. The coating doesn’t insulate the signal — the wire contacts the terminal metal.

Reliability — GE’s published MTBF for the FSAAG1ABA: 160,000 hours (ground fixed, 40°C ambient, humid environment). The ABA is for the places where analog inputs go to die — offshore, coastal, chemical plants, wastewater. Eight isolated channels. HART pass-through. Conformal coating. It’s expensive. It’s specialized. But it works. Just use a torque driver on the terminal screws. Don’t strip the threads. Clear the latch terminal if coated. And don’t buy refurbished. The hand-applied coating will bubble and peel. The HART will fail. And you won’t know until the pressure reading is wrong. At 2 AM. On an offshore platform. In the Gulf. Ask me how I know.

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