Process Safety & SIS Solution – TRICONEX 3700A | Tricon TMR Analog Input Module
Where This Product Is Used
The TRICONEX 3700A Analog Input Module is a core I/O component of the Tricon Triple Modular Redundant (TMR) Safety Instrumented System. It is deployed in safety-critical environments where continuous process monitoring and fault-tolerant signal acquisition are mandatory:
- Oil & Gas: Wellhead control panels, pipeline SCADA, compressor station ESD, and offshore platform SIS
- Petrochemical & Refining: Reactor temperature/pressure monitoring, distillation column safety loops, and fired heater burner management
- Power Generation: Turbine protection systems, boiler safety interlocks, and nuclear auxiliary safety systems
- Chemical Processing: Batch reactor SIS, toxic gas detection loops, and high-integrity pressure protection systems (HIPPS)
- LNG & Terminal Operations: Cryogenic process monitoring, loading arm ESD, and tank farm safety systems
Technical Specifications
| Part Number | 3700A |
| Manufacturer | TRICONEX (Schneider Electric) |
| Series | Tricon TMR Safety System |
| Module Type | Analog Input Module |
| Architecture | Triple Modular Redundant (TMR) – 2oo3 voting |
| Input Channels | 8 channels per module |
| Input Signal Range | 4–20 mA (current loop) |
| Resolution | 12-bit A/D conversion |
| Isolation | Optical isolation per channel |
| Safety Integrity Level | SIL 3 (IEC 61508 / IEC 61511) |
| Diagnostics | Continuous self-diagnostics with fault annunciation |
| Hot-Swap | Yes – online replacement without process shutdown |
| Weight | 2,850 g |
| Communication | Tricon backplane bus |
| Operating Temperature | 0°C to 60°C |
| Humidity | 5% to 95% RH, non-condensing |
Why Engineers Specify This Model
- TMR 2oo3 Voting Logic: Three independent signal paths vote on every measurement, eliminating single-point failures and enabling fault detection without spurious trips
- SIL 3 Certified: Meets the highest functional safety requirements under IEC 61508 and IEC 61511 for safety instrumented functions
- Online Hot-Swap: Modules can be replaced under live process conditions, supporting zero-downtime maintenance strategies
- Continuous Diagnostics: Built-in self-test routines detect open circuits, short circuits, and out-of-range signals in real time
- Proven Field Record: Deployed in thousands of SIS installations globally across major EPC and operating company projects
- Backward Compatibility: Integrates with existing Tricon chassis and Tristation 1131 programming environment
Complete System Bill of Materials
The 3700A is typically specified alongside the following Tricon system components:
- Tricon Main Chassis (e.g., 8110, 8310)
- Tricon Communication Module (e.g., 4351B, 4352B)
- Tricon Power Supply Module (e.g., 8312)
- Tricon Analog Output Module (e.g., 3805E)
- Tricon Digital Input Module (e.g., 3501E, 3503E)
- Tricon Digital Output Module (e.g., 3601E, 3603E)
- Tristation 1131 Engineering Workstation Software
- Field Termination Assembly (FTA) for 3700A
Compliance & Industry Standards
- IEC 61508 – Functional Safety of E/E/PE Safety-Related Systems (SIL 3)
- IEC 61511 – Functional Safety for the Process Industry Sector
- IEC 61131-3 – Programmable Controllers (Tristation 1131 environment)
- ANSI/ISA-84 – Safety Instrumented Systems for the Process Industry
- CE Marking – European conformity for industrial equipment
- FM / CSA Approvals – Applicable hazardous area certifications
Quality Assurance & Sourcing
Konmask.com specializes in industrial automation components for safety-critical applications. Every TRICONEX 3700A unit offered through our platform is:
- Sourced from verified supply channels with documented traceability
- Inspected for physical integrity, label authenticity, and firmware revision prior to dispatch
- Packaged in anti-static, shock-protected materials suitable for international freight
- Supported by pre-sale technical consultation for system compatibility verification
How to Source This Part
- Confirm your Tricon chassis revision and existing I/O slot configuration before ordering
- Contact our team via email or phone to verify stock availability and lead time
- Request a quotation – we provide competitive pricing for single units and project-volume orders
- Arrange shipping – we support DDP, DAP, and EXW Incoterms for global delivery
- Receive and verify – all shipments include packing list and inspection report
Application-Specific FAQ
Q: Is the 3700A compatible with the Tricon v9 and v10 chassis?
A: The 3700A is designed for the Tricon platform. Compatibility depends on chassis revision and firmware version. Contact our technical team to confirm fit for your specific system configuration.
Q: Can the 3700A be used in Class I Division 2 hazardous areas?
A: The module itself is installed in the safe area control room. Field instruments in hazardous areas connect via appropriate barriers or isolators. Consult your SIS design engineer for barrier selection.
Q: What is the difference between 3700A and 3703E?
A: The 3703E is a newer-generation analog input module with enhanced diagnostics and higher channel density. The 3700A remains widely used in legacy Tricon installations. We stock both models.
Q: Do you provide functional testing before shipment?
A: We perform visual and physical inspection. Full functional testing on Tricon hardware requires a live chassis. We recommend commissioning verification by your system integrator upon installation.
Q: What is the typical lead time?
A: In-stock units ship within 3–5 business days. Out-of-stock items are sourced within 2–6 weeks depending on market availability. Contact us for current stock status.
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