TRICONEX AI3351S2 Product Introduction
1. Product Overview
The TRICONEX AI3351S2 is a high-reliability analog input (AI) module designed for TRICONEX’s Tricon safety instrumented systems (SIS)—critical for high-risk industries like oil & gas, petrochemicals, and power generation. It focuses on capturing precise analog signals from field sensors (e.g., pressure, temperature, level transducers) and transmitting them to the Tricon SIS controller, enabling real-time monitoring and safety interlocks to prevent hazardous incidents (e.g., overpressure, temperature spikes).
Integrating triple-modular redundancy (TMR) technology and SIL 3 compliance, it ensures fault tolerance and data integrity in mission-critical applications. Compatibility with TRICONEX Tricon controllers (e.g., Tricon CX) and standard industrial sensors makes it a core component for maintaining operational safety in harsh, high-risk environments.
2. Technical Parameters (Table)
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Category
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Specification
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Device Type
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Input Channels
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8 differential analog input channels (isolated per channel)
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Input Types
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4–20 mA DC (2-wire/4-wire); 0–10 V DC; RTD (PT100, PT1000); Thermocouple (J, K, T, E, R, S, B)
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Resolution
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16 bits (for 4–20 mA/0–10 V); 24 bits (for RTD/thermocouple)
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Accuracy
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±0.1% FS (4–20 mA/0–10 V); ±0.2% FS (RTD); ±0.5% FS (thermocouple)
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Isolation
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Channel-to-channel: 500 Vrms; Channel-to-backplane: 1500 Vrms
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Communication
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Tricon backplane interface (compatible with Tricon CX/3000 controllers)
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Power Supply
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5 V DC (from Tricon controller backplane); Power consumption: ≤3 W (full load)
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Environmental Ratings
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Operating temperature: 0°C to +60°C (32°F to +140°F); Storage temperature: -40°C to +85°C (-40°F to +185°F); Humidity: 5%–95% (non-condensing); Protection class: IP20 (module, installed in Tricon cabinet)
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Safety Certifications
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SIL 3 (IEC 61508); ATEX Zone 2; IECEx; Class I, Div 2 (UL/CSA)
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Mechanical Design
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Mounting: Tricon controller backplane slot; Dimensions: 102 mm (W) × 165 mm (H) × 229 mm (D); Weight: ~450 g (0.99 lbs)
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3. Product Specifications & Features
3.1 Core Specifications
The TRICONEX AI3351S2 is optimized for safety-critical signal acquisition, with 8 isolated differential channels supporting diverse sensor types—eliminating cross-talk and ensuring reliable data from multiple process points (e.g., 4 pressure sensors + 2 temperature RTDs + 2 level transducers). Its 24-bit resolution for RTD/thermocouple inputs ensures precise temperature monitoring (critical for reactor control), while ±0.1% FS accuracy for 4–20 mA signals maintains consistency in pressure/flow measurements.
TMR technology (triple redundant hardware) provides fault tolerance: if one channel fails, the module automatically uses data from the remaining two to avoid signal loss—essential for SIL 3 applications where downtime or incorrect data could lead to safety incidents.
3.2 Key Features
- TMR Fault Tolerance: Triple-modular redundancy ensures continuous operation even with single-channel failures, meeting SIL 3 safety requirements.
- Multi-Sensor Compatibility: Supports 4–20 mA, voltage, RTD, and thermocouple inputs, reducing the need for multiple module types in SIS.
- High Isolation: Channel-to-channel and channel-to-backplane isolation prevents electrical interference, critical in noisy industrial environments (e.g., near high-voltage equipment).
- Safety Compliance: SIL 3, ATEX, and Class I, Div 2 certifications enable use in the most high-risk industries (e.g., oil refineries, chemical plants).
- Seamless SIS Integration: Designed for TRICONEX Tricon controllers, ensuring plug-and-play compatibility and simplified SIS configuration.
4. Other TRICONEX SIS & I/O Modules
TRICONEX offers complementary modules for safety instrumented systems:
- TRICONEX DI3351: Digital input module (16 channels, 24 V DC) for status monitoring (e.g., valve position, pump on/off).
- TRICONEX DO3351: Digital output module (8 channels, relay) for safety interlocks (e.g., emergency shutdown valves, pump stops).
- TRICONEX AI3352: 16-channel analog input module (expanded capacity for large-scale SIS, e.g., refinery process units).
- TRICONEX AO3351: Analog output module (4 channels, 4–20 mA) for control signals (e.g., valve positioners, variable speed drives).
- TRICONEX TI3351: Temperature input module (8 channels, dedicated RTD/thermocouple) for high-precision temperature monitoring (e.g., reactor cores).
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