Triconex 3721 Differential Analog Input Module

Description:

The TRICONEX 3721 Differential Analog Input Module is used in safety instrumented systems for acquiring and processing analog voltage signals from industrial field devices. Commonly installed in oil and gas facilities, chemical plants, power generation systems, and critical process automation environments requiring high-reliability analog monitoring. Control engineers and maintenance teams use this module for SIS repairs, system upgrades, replacement of failed I/O modules, and maintaining Tri-conex fault-tolerant safety operation.

Applications:

The TRICONEX 3721 Analog Input Module is commonly used in Tri-conex Triple Modular Redundant (TMR) safety systems to monitor analog process signals such as transmitters, sensors, and instrumentation devices. The module provides 32 differential DC-coupled input points with programmable voltage ranges of 0–5 VDC or ±5 VDC, supporting safety-critical process monitoring applications.

Technical Specifications:

• Manufacturer: TRICONEX
• Model / Part number: 3721
• Product type: Differential analog input module
• System platform: Tricon Safety Instrumented System (SIS)
• Module architecture: Triple Modular Redundant (TMR)
• Input channels: 32 differential DC-coupled inputs
• Input voltage range: 0–5 VDC or ±5 VDC
• Resolution: 12-bit or 14-bit programmable
• Input update rate: Approximately 10 ms
• Accuracy: Less than 0.15% of full scale range (0°C to 60°C)
• Common mode rejection: -85 dB (DC–100 Hz)
• Function: Converts analog field voltage signals into digital data for Tricon processors
• Isolation: Differential input design for improved noise rejection
• Application: Safety instrumented systems, emergency shutdown systems (ESD), process monitoring, and industrial automation
• Installation: Tri-conex control chassis/rack mounting
• Operating environment: Industrial process control environments

Common Replacements:

• TRICONEX 3721 Differential Analog Input Module
• TRICONEX 3700A TMR Analog Input Module
• Compatible Tri-conex 32-Channel Analog Input Module