GE DS3820P1MB

Key Parameters

• Channels: 4 isolated analog inputs

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

• Resolution: 16-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)

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

• Measurement Range: –200°C to +850°C

• 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 W

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

• Terminals: Screw-type (suffix-dependent)

Advantages

• Direct Pt100 connection – eliminates external transmitters; saves panel space and cost.

• 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.

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

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

• High accuracy – ±0.05°C for precise temperature control.

• 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 DS3820P1MB is the specialized Pt100 input module with per-channel isolation. Compared to using external transmitters with standard analog inputs, it saves significant panel space, reduces wiring, and lowers total installed cost (4 channels in one module vs. 4 separate transmitters + AI module). Against competitor Pt100 modules, the DS3820P1MB offers superior per-channel isolation and higher accuracy at a competitive price. For Pt100 temperature monitoring applications, the DS3820P1MB delivers the most comprehensive and cost-effective solution.

Selection Tips

• Choose DS3820P1MB when you need to measure Pt100 RTD sensors with high accuracy and per-channel isolation.

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

• 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.

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

• Ensure your PLC/DCS can handle the temperature data format from the DS3820P1MB.

Precautions

• Lead resistance: For 2-wire sensors, lead resistance directly adds error – use 3-wire or 4-wire for accurate measurements. The DS3820P1MB 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.

• Power sequencing: Apply backplane power before field power.

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

• Spare: Keep one spare DS3820P1MB for critical Pt100 temperature loops – the specialized feature set may have longer lead times.