GE DS3820PSWA

Key Parameters

• Channels: 4 isolated analog inputs

• Sensor Type: Pt100 (2‑wire, 3‑wire, or 4‑wire – software‑configurable per channel)

• Resolution: 24‑bit ADC

• Accuracy: ±0.05°C (Pt100, 25°C); ±0.2°C over –40°C to +70°C

• Excitation Current: Software‑selectable 0.1 mA, 0.5 mA, 1 mA (per channel)

• Excitation Power: 24 V DC (field‑supplied) – requires external 24 V DC supply for sensor excitation

• Module Power Input: 18–72 V DC (wide‑range) – compatible with 24 V, 48 V, and 60 V DC systems

• Lead Resistance Compensation: Automatic for 3‑wire and 4‑wire configurations

• Measurement Range: –200°C to +850°C

• Sampling Rate: Up to 50 Hz per channel (with 50/60 Hz noise rejection)

• Diagnostics: Open‑circuit detection, short‑circuit detection, over‑range/under‑range, signal‑loss detection, per‑channel LED status

• Isolation: 1500 V RMS (field‑to‑backplane); 500 V RMS between channels (per‑channel isolation)

• Terminal Type: Screw‑type – per suffix “A”

• Power Consumption: ≤4.5 W (module logic + sensor excitation)

• Operating Temperature: –40°C to +70°C

Advantages

• Wide‑range DC power input (18–72 V) – compatible with 24 V, 48 V, and 60 V DC systems; eliminates the need for separate power converters in non‑standard installations.

• Premium accuracy – ±0.05°C; high precision for demanding applications.

• 24‑bit resolution – provides superior measurement fidelity.

• Per‑channel isolation – 500 V between channels; prevents ground loops and cross‑channel interference.

• Automatic lead compensation – for 3‑wire/4‑wire RTDs, cancels lead resistance errors for accurate temperature readings.

• Software‑configurable per channel – wire configuration and excitation current independently settable.

• Built‑in linearization – provides direct temperature readout in °C or °F; no scaling required.

• Enhanced diagnostics – includes signal‑loss detection for proactive maintenance.

• Open/short detection – detects broken wires or sensor shorts instantly.

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

• Wide measurement range – –200°C to +850°C covers most industrial applications.

Applications

• Telecom & data centers – temperature monitoring in 48 V DC environments

• Rail & transportation – onboard temperature monitoring in 24–110 V DC systems (with appropriate supply range)

• Renewable energy – solar and wind installations with 48 V or 60 V DC bus systems

• Industrial machinery – equipment with non‑standard DC power buses

• Off‑grid installations – battery‑powered systems with variable DC voltages

• Oil & gas – remote monitoring with solar‑powered 24 V or 48 V systems

• HVAC – building‑wide temperature monitoring

• Pharmaceutical manufacturing – fermenter, reactor, and storage temperature control

Competitor Comparison

The DS3820PSWA is the wide‑range DC power input variant – the most flexible solution for plants with non‑standard DC buses (24 V, 48 V, or 60 V). Compared to the standard DS3820PSSB (24 V only), it offers broader power compatibility at a similar cost. Against the line‑powered DS3820PSLB1A, it is more cost‑effective but requires a local DC supply. For applications with 48 V or 60 V DC systems, the DS3820PSWA eliminates the need for separate power converters, simplifying installation and reducing panel space.

Selection Tips

• Choose DS3820PSWA when your plant operates on 24 V, 48 V, or 60 V DC power and you need Pt100 temperature monitoring with screw‑terminal wiring.

• Ideal for telecom, rail, renewable energy, and off‑grid installations with non‑standard DC power buses.

• Verify the wire configuration (2‑wire, 3‑wire, or 4‑wire) – software‑configurable per channel.

• For 2‑wire sensors, lead resistance adds error – use 3‑wire or 4‑wire for accurate measurements.

• If vibration resistance is critical, consider the spring‑clamp variant DS3820PSWB (if available) instead.

• If your sensors are located far from the control panel (>100 m), consider the line‑powered DS3820PSLB1A variant for superior long‑distance performance.

• Not suitable for Pt1000, Ni RTDs, or thermocouples – use dedicated modules.

• Ensure your PLC/DCS can handle the data format from DS3820PSWA.

Precautions

• Power input range: The DS3820PSWA accepts 18–72 V DC – do not exceed 72 V DC to avoid damage.

• Lead resistance: For 2‑wire sensors, lead resistance directly adds error – use 3‑wire or 4‑wire for accurate measurements. The DS3820PSWA compensates for 3‑wire/4‑wire automatically.

• Excitation current: Higher currents (1 mA) produce self‑heating errors in small Pt100 elements – use 0.1 mA or 0.5 mA for sensitive sensors.

• Wiring: Use shielded twisted‑pair cables; ground shield at module end only. For 4‑wire, use separate pairs for excitation and sense leads.

• External 24 V supply: Ensure the field supply has sufficient capacity for the excitation current of all channels (up to 4 mA total at 1 mA per channel).

• Signal‑loss detection: Requires minimum sensor impedance – very low‑impedance sensors may not trigger detection.

• Power sequencing: Apply backplane power before field power.

• Calibration: Perform periodic calibration using precision resistors to maintain accuracy.

• Spare: Keep one spare DS3820PSWA for critical temperature loops – the wide‑range power variant may have longer lead times.