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Product Overview
The TRICONEX 3351 is a high-performance analog input module engineered by TRICONEX, a globally recognized leader in safety instrumented systems (SIS) and industrial automation. Designed for mission-critical applications, this module serves as a core component of the TRICONEX Tricon and Tricon CX safety systems, providing precise signal conditioning and processing for analog inputs in harsh industrial environments.
As part of TRICONEX’s extensive I/O module portfolio, the TRICONEX 3351 is optimized for seamless integration with the brand’s triple modular redundancy (TMR) architecture, ensuring continuous operation even in the presence of component faults. It supports a wide range of analog signals, including 4–20 mA current loops and voltage inputs (0–5 V, ±10 V), with a 12-bit resolution and ±0.15% full-scale accuracy . This makes it ideal for applications where real-time monitoring of process variables (e.g., pressure, temperature, flow) is essential to maintain operational safety and efficiency.
The TRICONEX 3351 stands out for its robust design, featuring galvanic isolation between input channels and the system ground to protect against electrical noise and interference . It also incorporates advanced diagnostic capabilities, such as force-to-value diagnostic (FVD) and open/short circuit detection, enabling proactive fault identification and minimizing downtime. With a scan time of less than 1 ms for all 32 channels, this module delivers rapid data acquisition, critical for time-sensitive safety applications .
Technical Specifications
| Product model | TRICONEX 3351 |
|---|---|
| Manufacturer | TRICONEX |
| Product type | Analog input module |
| Input channels | 32 channels (commoned) |
| Input range | 4–20 mA (nominal), 2–22 mA (operational) |
| Resolution | 12 bits |
| Accuracy | ±0.15% of full scale |
| Isolation | 500 V DC (functional to protective earth), 800 V DC (functional to functional earth) |
| Operating temperature | -40°C to 70°C (-40°F to 158°F) |
| Physical dimensions | 102 mm (length) × 146 mm (width) × 28 mm (height) (4.02 in × 5.75 in × 1.10 in) |
| Weight | 1.5 kg (3.31 lbs) |
| Power supply | 24 V DC |
| Communication protocol | TRICONEX proprietary backplane bus |
| Diagnostic features | Built-in self-test (BIST), force-to-value diagnostic (FVD) |
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Related products
- TRICONEX AI3301: A 16-channel analog input module with similar SIL 3 certification but fewer channels, suitable for smaller-scale applications requiring cost-effective signal monitoring.
- TRICONEX DI3301: A digital input module that complements the TRICONEX 3351 by handling discrete signals (e.g., switch states), enabling comprehensive monitoring of both analog and digital process variables.
- TRICONEX DO3301: A digital output module designed to work alongside the TRICONEX 3351, converting control signals from the processor into actions for field devices like valves and actuators.
- TRICONEX T8431: A central processor module that processes data from modules like the TRICONEX 3351 to execute safety logic and control strategies, ensuring real-time decision-making.
- TRICONEX 3625: A power supply module that provides stable 24 V DC power to the TRICONEX 3351 and other I/O modules, ensuring consistent operation in fluctuating power environments.
- TRICONEX AI3401: A redundant analog input module offering enhanced fault tolerance, making it suitable for systems requiring 24/7 uninterrupted operation.
Main features and advantages
The TRICONEX 3351 excels in safety-critical environments, thanks to its SIL 3 certification (IEC 61508), which guarantees its reliability in applications where failure could lead to catastrophic consequences, such as oil refinery emergencies or chemical plant shutdowns . Its triple modular redundancy (TMR) architecture ensures that even if one channel fails, the remaining two continue to provide accurate data, eliminating single points of failure.
Another key strength is its high-speed performance. With a scan time of <1 ms for all 32 channels, the TRICONEX 3351 enables rapid signal acquisition, critical for applications requiring real-time response to process changes. Its wide input range (2–22 mA) and high resolution (12 bits) allow precise measurement of even subtle variations in analog signals, supporting predictive maintenance and process optimization.
The module’s robust design includes galvanic isolation and electromagnetic interference (EMI) immunity, ensuring signal integrity in noisy industrial settings. It also features advanced diagnostics, such as open/short circuit detection and FVD, which simplify troubleshooting and reduce maintenance efforts. Additionally, its compact form factor (102 mm × 146 mm × 28 mm) and DIN rail/rack mounting compatibility make it easy to integrate into space-constrained control cabinets .
Installation and maintenance
Pre-installation preparations: Before installing the TRICONEX 3351, verify that the target TRICONEX system rack is compatible with the module and that the 24 V DC power supply meets its requirements. Inspect the module for physical damage, such as bent pins or cracked casing, and ensure that field wiring is properly terminated and labeled. Each input channel should be connected to the appropriate field device (e.g., pressure transmitters, flow meters), with wiring impedance matched to the module’s specifications (180 Ω source impedance) . Grounding should be checked to prevent electrical interference, and the mounting surface should be clean and level.
Maintenance suggestions: Regularly monitor the TRICONEX 3351 using the TRICONEX system software to review diagnostic reports and channel statuses. Inspect terminal block connections quarterly for tightness and corrosion, as loose connections can cause signal degradation. In dusty environments, use compressed air (low pressure) to clean the module’s vents and connectors. Avoid exposing the module to extreme temperatures or humidity beyond its rated range (-40°C to 70°C). In case of a fault, refer to the TRICONEX troubleshooting guide for step-by-step diagnostics; do not attempt to open the module, as this may void the warranty. Always use anti-static wristbands during maintenance to prevent electrostatic discharge damage.
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Application fields
The TRICONEX 3351 is widely deployed in industries where safety, precision, and reliability are paramount. In oil and gas production, it monitors critical parameters like pipeline pressure, wellhead temperature, and gas flow rates, enabling rapid activation of emergency shutdown (ESD) systems to prevent leaks or explosions. In chemical plants, it plays a vital role in reactor control, ensuring that temperature, pressure, and reactant levels remain within safe limits during batch processes.
Power generation facilities, including nuclear and fossil fuel plants, rely on the TRICONEX 3351 to monitor turbine vibration, generator load, and cooling system performance. Its high-speed data acquisition helps detect anomalies early, preventing equipment failure and downtime. In pharmaceutical manufacturing, the module ensures compliance with strict quality standards by monitoring cleanroom environmental conditions (e.g., air pressure, humidity) and process variables in sterile filling lines.
The TRICONEX 3351 also finds applications in water treatment, where it measures pH levels, dissolved oxygen, and flow rates to optimize chemical dosing and ensure regulatory compliance. Its adaptability to diverse analog signals makes it a versatile choice for any industrial process requiring accurate, real-time monitoring of continuous variables.
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Product guarantee
Our company offers a one-year quality warranty service for the TRICONEX 3351, covering hardware malfunctions not caused by human factors. During the warranty period, if the module exhibits abnormal performance or functional failure, we will provide prompt replacement services. For discontinued models or urgent demands, our global supply chain network ensures rapid procurement of scarce spare parts, supporting the continuous operation of industrial systems. Our technical support team is available to assist with installation guidance, troubleshooting, and firmware updates, ensuring customers maximize the TRICONEX 3351’s performance throughout its lifecycle.
Whatsapp:+86 18859254943
E-mail :sales@ygplc.com
E-mail :sales@ygplc.com
