中文版
Phone: 
Email: 
WhatsApp: Description
Product Overview: TRICONEX 3721C
The TRICONEX 3721C is a Triple Modular Redundancy (TMR) differential analog input module engineered for high-integrity safety instrumented systems (SIS) and distributed control systems (DCS). As a core component of the TRICONEX Trident platform, this module delivers precise signal conditioning and conversion for critical industrial applications, ensuring continuous operation in environments where reliability is non-negotiable. Designed to interface with voltage-based sensors (e.g., pressure transmitters, thermocouples), the TRICONEX 3721C supports SIL 3-certified systems in industries such as oil and gas, chemical processing, and power generation, where even minor signal disruptions could lead to safety incidents or operational downtime.
Featuring 32 differential input channels, the TRICONEX 3721C accepts voltage signals ranging from 0–5V DC or -5–+5V DC with a programmable resolution of 12 or 14 bits, achieving accuracy within <0.15% of full-scale range (FSR) across temperatures from 0°C to 60°C. Its TMR architecture employs three independent signal paths that process data simultaneously, using a mid-value selection algorithm to eliminate errors caused by single-channel failures. The module includes advanced diagnostics, such as open-circuit detection, overvoltage protection (150V DC/115V AC continuous), and real-time channel health monitoring, which isolate faulty inputs while maintaining system functionality.
In automation systems, the TRICONEX 3721C acts as a critical link between field sensors and control logic, enabling real-time monitoring of process variables like pressure, flow, and temperature. Its hot-swap capability allows online replacement of faulty modules without system shutdowns, minimizing downtime in mission-critical scenarios. By combining high-precision signal processing with TMR fault tolerance, the TRICONEX 3721C enhances system availability and reduces lifecycle costs, making it ideal for retrofitting legacy systems or building new high-reliability control solutions.
Technical Specifications: TRICONEX 3721C
| Parameter | Value |
|---|---|
| Manufacturer | TRICONEX |
| Product Type | TMR Differential Analog Input Module |
| Physical Dimensions | 263 mm × 58 mm × 28 mm (10.35″ × 2.28″ × 1.10″) |
| Weight | 1.36 kg (2.99 lbs) [net]; 4 kg (8.82 lbs) [shipping] |
| Voltage Range | 0–5V DC or -5–+5V DC (±6% tolerance) |
| Input Channels | 32 differential, DC-coupled |
| Resolution | 12 or 14 bits (programmable) |
| Accuracy | <0.15% of FSR (0°C to 60°C) |
| Response Time | <10 ms |
| Power Consumption | <10W |
| Certifications | IEC 61508 (SIL 3), CE, UL, ATEX/IECEx (Zone 2) |
| Operating Temperature | -40°C to +70°C |
3721C
Related Products: TRICONEX 3721C
- TRICONEX 3700A: A TMR analog input module for 0–5V DC signals, suitable for general-purpose voltage measurements in less harsh environments.
- TRICONEX 3703E: An isolated TMR analog input module with enhanced noise immunity, designed for high-electromagnetic interference (EMI) settings.
- TRICONEX 3503E: A digital input module supporting 24V AC/DC signals, used to monitor discrete inputs like switches and alarms alongside the 3721C.
- TRICONEX 3601E: A digital output module with relay contacts, enabling the 3721C’s measured data to trigger actuators in safety-critical loops.
- TRICONEX 4351B: A communication module that connects the 3721C to Modbus, Ethernet/IP, and other industrial networks for data aggregation.
- TRICONEX 8310: A redundant power supply module providing stable 24V DC power to the 3721C and other Tricon components.
- TRICONEX 9566-710: An external termination panel (ETP) for the 3721C, offering surge protection and secure field wiring connections.
Main Features and Advantages: TRICONEX 3721C
The TRICONEX 3721C excels in fault-tolerant signal acquisition, leveraging its TMR architecture to ensure continuous operation even with partial channel failures. Each input channel undergoes independent diagnostics, including loopback testing and overrange detection, which prevent cascading system errors. This proactive approach to reliability reduces mean time to repair (MTTR) and ensures compliance with stringent safety standards like IEC 61508.
Its versatile voltage measurement capabilities make it compatible with a wide range of industrial sensors, eliminating the need for multiple specialized modules. Advanced signal conditioning—such as high common-mode rejection (-85 dB at DC–100 Hz) and high input resistance (10 MΩ)—minimizes interference from electromagnetic fields, ensuring stable performance in harsh industrial settings like near motors or high-voltage equipment.
The TRICONEX 3721C also supports seamless system integration through its compatibility with TRICONEX’s Trident and Tricon V9 platforms. Its hot-swap design allows technicians to replace the module during operation, while its compact form factor (identical to the 3721) ensures backward compatibility with existing chassis and termination panels. Additionally, the module’s conformal coating enhances resistance to dust, moisture, and chemical exposure, making it suitable for offshore or corrosive environments.
3721C
Installation and Maintenance: TRICONEX 3721C
Pre-installation Preparations:
Before installing the TRICONEX 3721C, verify that the control system’s power supply provides stable 24V DC ±10% and that the chassis is properly grounded to prevent EMI interference. Use the dedicated termination panel (e.g., TRICONEX 9566-710) for sensor wiring, ensuring correct polarity and lead configuration. Update the module’s firmware to the latest version to access advanced diagnostic features and compatibility with the Trident platform.
Before installing the TRICONEX 3721C, verify that the control system’s power supply provides stable 24V DC ±10% and that the chassis is properly grounded to prevent EMI interference. Use the dedicated termination panel (e.g., TRICONEX 9566-710) for sensor wiring, ensuring correct polarity and lead configuration. Update the module’s firmware to the latest version to access advanced diagnostic features and compatibility with the Trident platform.
Maintenance Suggestions:
Regular maintenance of the TRICONEX 3721C includes visual inspections for loose connections, corrosion, or physical damage, particularly in high-vibration or humid environments. Use TRICONEX’s diagnostic software to run periodic channel tests, verifying accuracy against calibrated reference sensors. Clean the module’s ventilation slots to prevent dust buildup, which can affect thermal performance. For long-term storage, keep the module in a dry environment with humidity below 80% and temperature between -20°C and +60°C.
Regular maintenance of the TRICONEX 3721C includes visual inspections for loose connections, corrosion, or physical damage, particularly in high-vibration or humid environments. Use TRICONEX’s diagnostic software to run periodic channel tests, verifying accuracy against calibrated reference sensors. Clean the module’s ventilation slots to prevent dust buildup, which can affect thermal performance. For long-term storage, keep the module in a dry environment with humidity below 80% and temperature between -20°C and +60°C.
Application Fields: TRICONEX 3721C
The TRICONEX 3721C is widely deployed in industries where precision voltage monitoring is critical to safety and efficiency. In oil and gas refineries, it monitors wellhead pressures and flow rates to trigger emergency shutdowns (ESD) during leaks or equipment failures. In chemical plants, it measures reactor temperatures and distillation column pressures to optimize reaction rates and prevent hazardous material releases.
Power generation facilities rely on the TRICONEX 3721C to monitor turbine vibration sensors and generator voltages, protecting expensive equipment from damage. In pharmaceutical manufacturing, it ensures consistent temperatures in sterilization autoclaves by interfacing with thermocouples, maintaining compliance with FDA regulations. The module also finds applications in water treatment, where it controls pump speeds and valve positions to optimize filtration processes.
3721C
Product Guarantee: TRICONEX 3721C
Our company offers a one-year quality warranty for the TRICONEX 3721C, covering hardware malfunctions unrelated to misuse or environmental damage. During the warranty period, we provide prompt replacement services for defective modules, supported by our global supply chain network to expedite delivery of scarce spare parts. Our technical support team, with deep expertise in TRICONEX products, offers 24/7 assistance for installation guidance, troubleshooting, and system integration. As a leading industrial control distributor with 17 years of experience, we maintain large stocks of both active and discontinued models, ensuring rapid fulfillment of urgent spare part requests to keep your operations running smoothly.
Contact Information
WhatsApp: +86 18859254943
E-mail: sales@ygplc.com
WhatsApp: +86 18859254943
E-mail: sales@ygplc.com
