Metso IOP371

Product Name: S800 I/O RTD (Resistance Temperature Detector) Input Module — IOP371

Product Introduction: 8-channel RTD input module for Valmet DNA / Metso S800 distributed I/O system; provides high-accuracy temperature measurement with full channel-to-channel and channel-to-bus isolation, supporting 2-, 3-, and 4-wire RTD connections.

Category: Metso

Description

Technical Specifications:

Channels: 8 independent RTD inputs
Sensor Types: Pt100 (most common), Pt1000, Ni100, Ni120, Cu10, Cu50; also custom resistance range
Wiring Modes: 2-wire, 3-wire, 4-wire (software-configurable per channel); 3-/4-wire eliminates lead resistance error
Measurement Accuracy: ±0.1 % of span or ±0.2 °C (typical @ 25 °C)
Resolution: 0.1 °C or better
Excitation Current: < 1 mA (minimizes sensor self-heating)
Isolation: Channel-to-channel 250 VAC / 300 VDC; I/O group-to-backplane 500 VAC
Open-Circuit Detection: Sensor break detection with configurable fail-safe action (force high/low/alarm)
Response Time: Per-channel software-filterable; typical 0.5 s – 5 s
Indicators: Green LED = Normal, Red LED = Fault/Break per module status
Termination: Front pluggable screw terminal block
Operating Temp: -20 °C to +70 °C; Hot-swappable in live rack
Power: 24 VDC from S800 I/O bus backplane

Installation Notes: Use shielded twisted-pair cable for RTD leads; route separately from high-voltage/power cables; 3-wire or 4-wire connection strongly recommended for runs > 10 m.

Applications: Temperature monitoring in pulp & paper, power plant auxiliary systems, chemical process plants using Valmet DNA DCS.

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