GE DS3820PIMB

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: ±0.03°C (Pt100, 25°C); ±0.12°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, signal-loss 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

• Premium accuracy – ±0.03°C; the highest precision Pt100 module in the family; ideal for critical temperature control.

• 24-bit resolution – provides superior measurement fidelity for demanding applications.

• 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

• Metrology & calibration labs – high-precision temperature measurement and sensor verification

• Semiconductor manufacturing – diffusion furnace and wafer processing with tight temperature tolerances

• Aerospace testing – component thermal profiling with highest accuracy

• Pharmaceutical – critical reactor temperature control with strict regulatory requirements

• Research & development – experimental thermal analysis and material testing

• Power generation – turbine inlet and bearing temperature monitoring

• HVAC – precision environmental chamber temperature control

Competitor Comparison

The DS3820PIMB is the premium Pt100 input module with 24-bit resolution and ±0.03°C accuracy. Compared to the DS3820P1MB (16-bit), it provides superior resolution and accuracy – essential for laboratory-grade and critical process applications. Against competitor premium Pt100 modules, the DS3820PIMB offers comparable performance with superior diagnostics (signal-loss detection) at a lower cost. For applications demanding the highest Pt100 temperature measurement accuracy, the DS3820PIMB delivers the best-in-class solution.

Selection Tips

• Choose DS3820PIMB when you need maximum precision for Pt100 temperature measurement – ideal for lab, R&D, semiconductor, and pharmaceutical 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 24-bit data resolution from the DS3820PIMB.

Precautions

• Lead resistance: For 2-wire sensors, lead resistance directly adds error – use 3-wire or 4-wire for accurate measurements. The DS3820PIMB 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.

• 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 ±0.03°C accuracy – the DS3820PIMB requires regular verification to maintain specification.

• Spare: Keep one spare DS3820PIMB for critical high-precision loops – premium modules typically have longer lead times.