GE DS3820AIQA

Key Parameters

• Channels: 8 differential, individually isolated

• Inputs: 4–20 mA, 0–20 mA, 0–5 V, 0–10 V, ±10 V (software-configurable)

• Resolution: 16-bit ADC

• Accuracy: ±0.1% FS (25°C); ±0.3% over –40°C to +70°C

• Isolation: 1500 V RMS per-channel (channel-to-channel and field-to-logic)

• Power: 24 V DC, ≤8 W (higher due to per-channel isolators)

• Diagnostics: Open-circuit, over/under-range, short-circuit detection, watchdog

• Common-mode rejection: CMRR > 110 dB

Advantages

• Per-channel isolation – a fault on one channel (e.g., high voltage surge) won’t affect others or the backplane.

• Software-configurable – each channel independently set for current or voltage.

• Hot-swappable – replace without rack power-down.

• Superior noise rejection – CMRR > 110 dB, ideal for high-EMI environments.

• Full diagnostics – detects open wires, shorts, and out-of-range conditions per channel.

Applications

• Power plants – monitoring multiple thermocouples/RTDs with ground potential differences

• Oil refineries – distributed sensors across large sites with varying ground potentials

• Mining & metals – high-voltage motor drive areas with significant electrical noise

• Medical/pharma – critical process parameters requiring fail-safe channel separation

• HVAC – large buildings with sensors on different power phases

Competitor Comparison

The DS3820AIQA outperforms group-isolated modules by preventing single-channel faults from propagating. Compared to competitor premium cards, it offers comparable isolation and diagnostics at a more accessible price point, making it the cost-effective choice for per-channel isolation needs.

Selection Tips

• Choose DS3820AIQA when sensors are distributed across different ground potentials or when channel fault containment is critical.

• Ideal for systems with high common-mode voltages or frequent sensor shorts.

• Verify your CPU supports the additional diagnostic data registers.

• Not suitable if your application does not require per-channel isolation – you can save cost with group-isolated variants.

Precautions

• Wiring: Use individually shielded cables per channel to maintain isolation integrity.

• Power budget: The DS3820AIQA draws up to 8 W – ensure your rack power supply has sufficient headroom.

• Configuration: Set each channel’s input type carefully; mismatched settings may cause inaccurate readings.

• Cooling: Higher power dissipation means adequate airflow is essential in dense racks.

• Spare: Keep a spare DS3820AIQA for critical processes – per-channel isolation modules have longer lead times.

• Grounding: Do not tie isolated commons together; maintain separate returns per channel.