TRICONEX 3721 analog input module

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TRICONEX 3721

TRICONEX 3721 is a high-performance analog input module launched by Invensys (now Schneider Electric), specifically designed for process automation and Safety Instrumented Systems (SIS).

Below is a summary of its key features and technical specifications:

Core Features

• High-reliability design: Uses a Triple Modular Redundancy (TMR) architecture to ensure continuous system operation even in the event of a single module failure, and supports hot swapping.
• Flexible input configuration: Supports both voltage signals (0–5 V, 0–10 V) and current signals (4–20 mA), making it compatible with a wide range of industrial field signal sources.
• High accuracy and resolution: Provides programmable 12-bit or 14-bit resolution with high measurement accuracy, suitable for applications up to SIL 3 safety integrity level.
• Strong compatibility: Fully compatible with the Triconex Trident system and supports configuration and monitoring through TriStation 1131 software.

Detailed Technical Specifications

Parameter	Specification
Input channels	32 differential analog input channels
Input type	Differential analog voltage
Input range	–5 V to +5 V, or 0 V to +5 V, or 0 V to +10 V
Resolution	Programmable 12-bit or 14-bit
Accuracy	Less than 0.15% of FSR from 0°C to 60°C
Input update rate	10 ms
Common-mode rejection ratio	–85 dB (DC–100 Hz)
Input overload protection	150 VDC / 115 VAC continuous
Operating temperature	–40°C to +70°C
Humidity range	5% to 95% RH (non-condensing)
Protection rating	IP65 (dust-tight and water-resistant)
Vibration / shock	0.05 g RMS (random) / 15 g (half-sine)
Certifications	Supports ATEX certification; suitable for intrinsically safe circuits in hazardous areas

Applications

This module is widely used in critical industries such as oil and gas, petrochemical, and power generation. Typical applications include monitoring pipeline pressure, reactor vessel temperature, and excitation control of power plant generators.