GE DS3820SMTV

Key Parameters

• Channels: 4 analog inputs with simultaneous sampling

• 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)

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

• Measurement Range: –200°C to +850°C

• Sampling Mode: Simultaneous (all channels sampled at the same instant)

• Sampling Rate: Up to 200 Hz per channel (high‑speed mode; filtering disabled)

• Phase Mismatch: < 0.05° at 50/60 Hz (between channels)

• EMC/Noise Rejection: Enhanced CMRR > 120 dB, built‑in 50/60 Hz digital filtering (reduces speed when enabled)

• 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: Screw‑type – per suffix “V”

• Power: 24 V DC backplane power, ≤4.5 W (plus external field supply)

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

Advantages

• Simultaneous sampling – captures all 4 channels at precisely the same moment; eliminates phase errors between signals – critical for thermal profiling and dynamic analysis.

• Fast 200 Hz sampling – captures rapid temperature changes; ideal for dynamic processes and transient thermal analysis.

• Enhanced EMI protection – CMRR > 120 dB; ideal for installations near VFDs, inverters, and high‑power switching equipment.

• Minimal phase mismatch (< 0.05°) – ensures accurate time‑correlated measurements for multi‑point thermal analysis.

• 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.

• Software‑configurable per channel – wire configuration and excitation current independently settable.

• Built‑in linearization – provides direct temperature readout in °C or °F.

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

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

• Wide measurement range – –200°C to +850°C covers most industrial applications.

Applications

• Thermal profiling – mapping temperature gradients across ovens, furnaces, and kilns

• Engine testing – simultaneous exhaust and component temperature monitoring in automotive and aerospace

• Turbine monitoring – high‑speed temperature profiling in power generation near high‑EMI equipment

• Induction heating – fast‑response temperature monitoring for heat treatment

• Semiconductor manufacturing – wafer temperature control with simultaneous multi‑point monitoring

• Research & development – dynamic thermal analysis and transient studies requiring time‑correlated data

• HVAC – multi‑zone temperature monitoring with phase‑accurate measurements

• Steel mills & foundries – dynamic temperature monitoring near high‑power equipment

Competitor Comparison

The DS3820SMTV is the screw‑terminal variant of the simultaneous‑sampling, EMI‑hardened Pt100 input module – capturing all 4 channels at the exact same instant with 200 Hz speed. Compared to the spring‑clamp DS3820SMTS, it offers traditional screw‑terminal wiring for panels where vibration is less of a concern, while maintaining the same simultaneous sampling, speed, and EMI resilience. Against standard sequential modules, it offers simultaneous sampling, 20× faster speed, and phase accuracy. For applications requiring time‑correlated, high‑speed temperature measurements in high‑EMI environments with screw‑terminal wiring, the DS3820SMTV delivers the best‑in‑class solution.

Selection Tips

• Choose DS3820SMTV when you need simultaneous, high‑speed temperature measurements (up to 200 Hz) with enhanced EMI protection and screw‑terminal wiring – ideal for traditional panel installations in high‑EMI environments.

• Ideal for oven profiling, engine testing, turbine monitoring, induction heating, semiconductor, and R&D applications.

• For maximum speed (200 Hz), disable input filtering – enabling 50/60 Hz rejection reduces sampling rate.

• 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 thermocouples or Pt1000 sensors – use dedicated universal modules for mixed sensor types.

• Ensure your PLC/DCS can handle the simultaneous data throughput from DS3820SMTV at 200 Hz.

Precautions

• Sampling rate vs. filtering: Maximum 200 Hz achieved with filtering disabled. Enable filtering only if noise rejection is required – it will reduce the sampling rate.

• Simultaneous sampling – all channels are sampled at the same instant; ensure all sensors are properly connected before starting acquisition.

• Lead resistance: For 2‑wire sensors, lead resistance directly adds error – use 3‑wire or 4‑wire for accurate measurements. The DS3820SMTV 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. Enhanced EMI protection requires proper grounding to achieve >120 dB CMRR.

• Data throughput: 200 Hz × 4 channels × 24‑bit data requires significant communication bandwidth – ensure your PLC/DCS can process the data rate.

• 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 – high‑speed operation may accelerate drift.

• Spare: Keep one spare DS3820SMTV for critical high‑speed loops – the simultaneous‑sampling, screw‑terminal variant may have longer lead times.