GE DS3820STBA

Key Parameters

• Channels: 4 isolated analog inputs

• Sensor Type: NTC thermistor (10kΩ, 100kΩ, custom curves) or PTC thermistor (silicon, platinum-based) – software‑configurable per channel

• Resolution: 24‑bit ADC

• Accuracy: ±0.05°C (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)

• Measurement Range: –40°C to +150°C (depending on thermistor type)

• Linearization: Built‑in (Steinhart‑Hart equation) – provides direct temperature readout in °C or °F

• Custom Sensor Support: User‑programmable R‑T curves (up to 64 points per channel)

• 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)

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

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

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

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

Advantages

• Direct thermistor support – eliminates external signal conditioners; reduces panel space and cost.

• Built‑in linearization – Steinhart‑Hart equation provides direct temperature readout; no scaling required.

• Custom sensor curves – supports user‑programmable R‑T curves for custom thermistors.

• 24‑bit resolution – provides superior measurement fidelity.

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

• Software‑configurable per channel – sensor type and excitation current independently settable.

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

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

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

• Wide measurement range – –40°C to +150°C covers most HVAC, medical, and automotive applications.

Applications

• HVAC systems – duct, return air, and room temperature monitoring with NTC thermistors

• Medical equipment – patient monitoring, incubator, and lab equipment temperature control

• Automotive – cabin temperature, battery pack, and motor temperature monitoring

• Industrial – motor winding temperature monitoring with PTC thermistors

• Laboratory equipment – environmental chambers, incubators, and baths

• Food processing – cold storage and refrigerator temperature monitoring

• Building automation – zone temperature sensing and energy management

• Consumer electronics – thermal management systems

Competitor Comparison

The DS3820STBA is the dedicated thermistor input module – offering four channels with built‑in linearization, custom sensor curve support, and per‑channel isolation. Compared to external thermistor amplifiers with standard AI modules, it saves significant panel space, reduces wiring, and lowers total installed cost. Against competitor thermistor modules, the DS3820STBA offers superior custom sensor support and per‑channel isolation at a competitive price. For thermistor‑based temperature monitoring applications, the DS3820STBA delivers the most comprehensive and cost‑effective solution.

Selection Tips

• Choose DS3820STBA when you need to measure thermistor temperature sensors (NTC or PTC) with high precision and direct temperature readout.

• Ideal for HVAC, medical, automotive, industrial, and laboratory applications.

• Verify the thermistor type (NTC or PTC) and nominal resistance (10kΩ, 100kΩ, etc.) – software‑configurable per channel.

• For custom thermistors, use the user‑programmable R‑T curve feature – supports up to 64 points per channel.

• For 2‑wire sensors, lead resistance adds error – use short leads or calibrate to compensate.

• Not suitable for RTDs or thermocouples – use dedicated modules for those sensor types.

• Ensure your PLC/DCS can handle the temperature data format from DS3820STBA.

Precautions

• Lead resistance: Thermistors are typically 2‑wire; lead resistance directly adds error – keep leads as short as possible or calibrate to compensate.

• Excitation current: Higher currents (1 mA) produce self‑heating errors – use 0.1 mA or 0.5 mA for sensitive thermistors.

• Custom curve programming: When programming custom R‑T curves, ensure accurate data points (minimum 16 points recommended for ±0.1°C accuracy).

• Wiring: Use shielded twisted‑pair cables; ground shield at module end only. Thermistor signals are low‑level – maintain separation from power cables.

• Sensor type selection: Each channel must be configured for NTC or PTC – ensure correct selection before operation.

• 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 or calibrated thermistors to maintain accuracy.

• Spare: Keep one spare DS3820STBA for critical thermistor loops – the specialized feature set may have longer lead times.