TRICONEX 3721N Differential Analog Input Module

Product Description

The Triconex 3721N is a nuclear-qualified, Triple Modular Redundant (TMR) Analog Input Module engineered by Schneider Electric for Tricon Safety Instrumented Systems (SIS) in Nuclear Power Plants (NPP). Utilizing the Next-Generation (NG) common core, this highly secure 32-channel differential, DC-coupled module provides precise, fault-tolerant voltage monitoring for safety-related instrumentation loops.

Technical Specifications

• Manufacturer: TRICONEX (By Schneider Electric / Invensys)

• System Series Line: Tricon V10 Safety-Related & Nuclear-Qualified Platforms

• Model Number Designation: 3721N (Core variant: 3721)

• Device Classification: Triple Modular Redundant (TMR) Differential Analog Input Module

• Nuclear Application Scope: Safety-Related (SR) deployment certified for Nuclear Power Plants (NPP)

• Core Control Engine: Built with the Next-Generation (NG) common core architecture

• Input Channel Capacity: 32 completely independent differential, DC-coupled inputs

• Configurable Operational Input Voltage Ranges: 0 to 5 VDC or -5 to +5 VDC (TriStation configurable)

• Signal Over-Range Margin: +6% operational measurement buffer headroom

• Analog-to-Digital (A/D) Resolution: 12-bit or 14-bit programmable resolution matrices

• Input Update Pipeline Sequence: 10 ms fast scan interval rate

• Absolute Temperature Accuracy: $< 0.15\%$ of Full Scale Range (FSR) from 0°C to 60°C (32°F to 140°F)

• Common Mode Rejection Performance: -85 dB typical (DC to 100 Hz bandwidth)

• Input Impedance Level Boundaries: 30 M$\Omega$ (DC) minimum input resistance

• Fault Overvoltage Overload Limit: -12V to +12V peak maximum continuous tolerance

Industrial Application Scenarios

The TRICONEX 3721N analog input module is explicitly qualified for Class 1E safety-related applications within the nuclear power generation industry, as well as critical processes in high-tier petrochemical setups. In nuclear power stations, this module interfaces directly with primary safety monitoring elements, including reactor core coolant temperature transmitters, steam generator pressure loops, containment isolation triggers, and containment water level gauges. Operating inside a Tricon TMR chassis, the 3721N translates vital voltage data into the processing logic. This setup guarantees that reactor control rods or safety injection pumps deploy instantly if operating parameters cross critical limits.