Invensys TRICONEX AI 3351 Input Module / Analog

The Invensys TRICONEX AI 3351 Input Module / Analog (often referenced as AI3351) is a high‑precision analog input card designed for use within the TRICONEX Trident Safety Instrumented System (SIS) platform.The Invensys TRICONEX AI 3351 Analog Input Module is designed for reliable process monitoring with 32 commoned input points. It operates on a nominal current of 4–20 mA DC and supports an operational range of 2–22 mA DC. The module can safely handle up to 33 V DC and an absolute maximum input current of 50 mA DC. With a 16 Hz input bandwidth, 180 Ω source impedance, and 12-bit resolution, it delivers precise and stable analog signal acquisition for critical industrial control applications.Its robust design, advanced diagnostics, and redundancy features make it a trusted choice for process industries where systems must meet high availability and safety integrity levels (SIL), such as oil & gas, chemicals, power generation, and petrochemicals.

Technical specifications

Model: AI 3351
Product Type: Analog Input Module
Points:32, commoned
Nominal input current:4–20 mA DC
Operational current range:2–22 mA DC
Absolute maximum field voltage:33 V DC
Absolute maximum input current:50 mA DC
Input bandwidth (3dB):16 Hz
Source impedance:180 Ω
Resolution:12 bits
Absolute error:0.15% of full scale (20 mA)
Diagnostic:Force-to-value diagnostic (FVD)
Scan time:<1 ms for all 32 points
Isolation: Functional‑to‑protective‑earth: 500 V DC min;
Logic isolation: 800 V DC min
Hot‑Swappable: Yes (supports online replacement)
Operating Temp.: Industrial range (typ. −40 °C to +70 °C)

Our address

Siming District, Xiamen City, Fujian Province

Call or Whatsapp

+86 18030175807

E-mail

sales7@apterpower.com

• Advanced Diagnostics: Equipped with continuous internal monitoring, the AI 3351 can instantly detect open circuits, short circuits, and signal anomalies, which significantly enhances operational safety and simplifies troubleshooting.
  
• High-Density Analog Acquisition: The AI 3351 provides 32 commoned analog inputs, allowing for the simultaneous measurement of multiple field sensors such as pressure, temperature, and flow transmitters within a single module.
• TMR Redundancy Architecture: Operating within the TRICONEX Triple Modular Redundant framework, the AI 3351 utilizes three independent channels that convert and vote on analog data to ensure maximum system integrity and fault tolerance.
• Fast Scan & High Precision: With a scan time of less than 1 ms and high-resolution conversion, the AI 3351 supports responsive control loops and provides highly accurate data for critical process monitoring applications.
• Robust Electrical Protection: High levels of electrical isolation (ranging from 500 V to 800 V DC) are built into the hardware to protect sensitive logic circuits from field transients and industrial electrical noise.

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