T3481A is not a minor rev of the T3481; it is a performance variant built for “fast-loop” duties: 250 µs channel refresh, differential voltage read-back terminals and zero-drift calibration without stopping the process. Target applications are gas-turbine inter-stage cooling valves, ethylene-cracking-furnace draft dampers and millisecond-trip differential-pressure valves—any control loop that needs command and feedback inside the same Tricon scan.
1.What makes it different
• 250 µs / 16 ch parallel update – four times faster than the standard T3481, fits directly into a 2 ms Tricon task.
• Every channel provides a differential 0–5 V read-back pin for positioner or transmitter feedback, saving one whole input board slot.
• On-line “auto-zero wipe”: Hall sensors disconnect the loop for 100 µs every 30 min, re-calibrate offset and gain, SIL 3 validity maintained.
• Field-side rating raised to 80 V dc, tolerates 48 V dc buses plus 100 % surge overhead.
2.Key data
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Item
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Value
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Function
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16 isolated current sinks + diff. voltage read-back
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Sink range
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0–22 mA (default 4–20 mA)
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Load capability
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0–1 kΩ @ 20 mA / 80 V
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Refresh & settle
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250 µs update all ch, <50 µs settling
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Read-back accuracy
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±0.05 % for 0–5 V
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Current accuracy
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±0.04 % FSR
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Temp. drift
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25 ppm/°C
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Isolation
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1 kV rms ch-to-bus, ch-to-ch
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On-line cal.
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Zero/gain, 30 min cycle, bumpless
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Diag. pulse
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0.3 mA, 80 µs, HART-0 transparent
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Field bus
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12–80 V dc
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Energy absorption
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2 J (inductive)
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Rack power
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5 V 1.2 A, 3.3 V 0.4 A
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MTBF (Telcordia)
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1.22 million h
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Temperature
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–40 … +75 °C
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Termination
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Push-in, 2.5 mm², pluggable
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3.Typical “fast-loop” wiring
① Gas-turbine cooling valve: Tricon DO → T3481A CHx current sink → servo-valve coil; valve potentiometer 0–5 V wired to the same board “read-back” terminal → Tricon AI—command and feedback in one cable.
② Millisecond relief valve: T3481A outputs 8 mA (safe position) → cryo-solenoid; when SPEED task triggers, the board slews to 20 mA within 250 µs, valve fully open, one full scan faster than legacy schemes.
What happens next?
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