GE DS3820PSSB

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

• 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: Spring‑clamp (tool‑free, vibration‑resistant) – per suffix “B”

• Power: 24 V DC backplane power, ≤3.5 W (plus external 24 V field supply for sensor excitation)

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

Advantages

• Spring‑clamp terminals – tool‑free push‑in wiring; reduces installation time; highly resistant to vibration loosening – critical for transportation, marine, and heavy industrial applications.

• Standard 24 V DC operation – compatible with existing plant 24 V power infrastructure; no special line‑power requirements.

• 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

• Transportation & rail – bearing and motor temperature monitoring with vibration‑resistant wiring

• Marine & offshore – engine room temperature monitoring with spring‑clamp terminals

• HVAC – duct, return air, and chilled water temperature monitoring

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

• Food processing – oven, sterilization, and cold storage temperature profiling

• Power generation – bearing, winding, and cooling water temperature monitoring

• Chemical processing – reactor and pipeline temperature control

• Semiconductor manufacturing – precision chamber temperature monitoring

Competitor Comparison

The DS3820PSSB is the standard 24 V spring‑clamp Pt100 input module – the most cost‑effective spring‑clamp option for general‑purpose Pt100 monitoring. Compared to the line‑powered DS3820PSLB1A, it requires an external 24 V field supply but offers a lower cost point and simpler integration into existing 24 V DC plants. Against standard screw‑terminal Pt100 modules, it adds vibration‑resistant wiring and superior diagnostics with minimal cost increase. For general‑purpose temperature monitoring in high‑vibration environments where 24 V infrastructure already exists, the DS3820PSSB delivers the most balanced and cost‑effective solution.

Selection Tips

• Choose DS3820PSSB for general‑purpose Pt100 temperature monitoring in high‑vibration environments where existing 24 V DC field power is available.

• Ideal for transportation, marine, HVAC, pharmaceutical, and food processing applications.

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

• Confirm spring‑clamp terminals accept your wire gauge (typically 0.2–2.5 mm² / 24–14 AWG) and consider using ferrules for stranded wire.

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

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

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

• Ensure your PLC/DCS can handle the data format from DS3820PSSB.

Precautions

• Wire preparation: Use only solid or stranded wire with proper ferrule termination – bare stranded wire may not make reliable contact in spring‑clamp terminals.

• Wire insertion: Insert wire fully into the spring‑clamp opening until it stops; pull gently to verify secure connection.

• Lead resistance: For 2‑wire sensors, lead resistance directly adds error – use 3‑wire or 4‑wire for accurate measurements. The DS3820PSSB 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 DS3820PSSB for critical temperature loops – the spring‑clamp variant may have longer lead times. Also stock replacement ferrules for spring‑clamp terminals.