GE DS3820OSCC

Key Parameters

• Channels: 4 isolated analog inputs

• Sensor Types: Pt100, Pt1000, Ni100, Ni1000, Cu100 (software-selectable per channel)

• Wire Configuration: 2-wire, 3-wire, or 4-wire (software-configurable per channel)

• Resolution: 24-bit ADC

• Accuracy: ±0.05°C (Pt100, 25°C); ±0.15°C over –40°C to +70°C

• Excitation Current: Software-selectable 0.1 mA, 0.5 mA, 1 mA, 2 mA (per channel)

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

• Measurement Range: –200°C to +850°C (Pt100); –50°C to +250°C (Ni)

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

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

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

• Power: 24 V DC backplane power, ≤3.5 W

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

• Terminals: Screw-type (suffix-dependent)

Advantages

• Universal RTD support – accepts Pt100, Pt1000, Ni100, Ni1000, Cu100, and others; single module covers multiple sensor types.

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

• 24-bit resolution – provides highest precision for demanding temperature applications.

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

• Software-configurable per channel – sensor type, wire configuration, and excitation current independently settable.

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

• 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

• HVAC systems – 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

• Laboratory equipment – environmental chambers, incubators, and baths

• Water/wastewater – process temperature monitoring

Competitor Comparison

The DS3820OSCC is the universal RTD input module with per-channel isolation and 24-bit resolution. Compared to the Pt-only DS3820AIRA, it offers wider sensor support (Ni, Cu) and superior resolution (24-bit vs. 16-bit). Against external transmitters with standard AI modules, it saves significant panel space, reduces wiring, and lowers total installed cost (4 channels in one module). For demanding RTD temperature monitoring applications, the DS3820OSCC delivers the most comprehensive and cost-effective solution.

Selection Tips

• Choose DS3820OSCC when you need RTD temperature measurement with high precision, per-channel isolation, and multi-sensor flexibility (Pt, Ni, Cu).

• Ideal for HVAC, pharmaceutical, food processing, power generation, and chemical applications.

• Verify the sensor type (Pt100, Pt1000, Ni100, etc.) and wire configuration (2-wire, 3-wire, 4-wire) – software-configurable per channel.

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

• Not suitable for thermocouples – use dedicated TC modules.

• Ensure your PLC/DCS can handle 24-bit data resolution from the DS3820OSCC.

Precautions

• Lead resistance: For 2-wire sensors, lead resistance directly adds error – use 3-wire or 4-wire for accurate measurements. The DS3820OSCC compensates for 3-wire/4-wire automatically.

• Excitation current: Higher currents (2 mA) produce self-heating errors in small RTD 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.

• Sensor matching: Verify your sensor curve matches the selected type (Pt100 vs. Pt1000, Ni vs. Cu).

• Power sequencing: Apply backplane power before field power.

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

• Spare: Keep one spare DS3820OSCC for critical RTD loops – the universal RTD feature set may have longer lead times.