Description
The Triconex 3805E is a high-reliability Analog Output (AO) module designed for the Tricon Triple Modular Redundancy (TMR) system. It is engineered for critical control loops where a failure could lead to significant safety risks or production losses. The 3805E provides 8 isolated output channels, typically used to drive final control elements such as valves, actuators, and speed controllers. By utilizing TMR architecture, the module ensures that the output signal remains stable even if a component within one of its three internal branches fails. It features comprehensive self-diagnostics and the ability to detect field-side problems like open circuits or short circuits, ensuring the integrity of the entire safety loop.
Technical Specifications and Datasheet
Model Number: 3805E Product Series: Tricon TMR System Module Type: Analog Output (AO) Output Channels: 8 Channels, isolated Output Signal Range: 4–20 mA DC Resolution: 12-bit Accuracy: < 0.25% of FSR (Full Scale Range) External Power: 24V DC (Required for loop power) Power Dissipation: < 15W Dimensions: 400 mm x 30 mm x 300 mm Weight: 1.25 kg Country of Origin: USA Mounting: Tricon I/O Chassis
Application Fields
The 3805E is a core component in Safety Instrumented Systems (SIS) across various heavy industries:
- Petrochemical: Controlling fuel and steam valves in Emergency Shutdown (ESD) applications.
- Power Generation: Managing governor valve positions and feedwater control.
- Oil and Gas: Regulating pressure control valves on offshore platforms and pipelines.
- Chemical Manufacturing: Precise dosing and flow control for hazardous chemical reactions.
TRICONEX 3805E
TRICONEX 3805E
TRICONEX 3805E
Product Instructions and Usage
Installation of the 3805E should be performed within a powered Tricon chassis. The module is hot-swappable, allowing for maintenance without process interruption. Field wiring must be connected via an External Termination Panel (ETP), which houses the necessary terminals for the 4–20mA loops. Ensure that an external 24V DC power supply is connected to the ETP to provide the required current for the output loops. Configuration of the output ranges and fail-safe states (e.g., “fail to low” or “hold last value”) is managed through the TriStation 1131 software. Status LEDs on the front panel, including “PASS,” “FAULT,” and “ACTIVE,” provide immediate visual feedback on the module’s operational health.
Common Questions and Answers (Q&A)
What does the “TMR” feature do for an analog output? In the 3805E, the TMR architecture uses three independent output legs that are internally voted. If one leg disagrees or fails, the remaining legs maintain the correct 4–20mA signal, preventing a “glitch” or trip in the field device.
Does the module provide power to the loop? The 3805E typically requires an external 24V DC source connected at the termination assembly to drive the current loops for the field actuators.
Can I replace this module while the system is running? Yes, the Triconex platform is designed for online replacement. When a new 3805E is inserted, it automatically synchronizes its state with the active main processors.
What happens if a field wire is disconnected? The 3805E features “Load Open” detection. If a wire breaks, the module will trigger a diagnostic alarm in the system to alert operators of the fault.
Is this module suitable for SIL 3 applications? Yes, when used within a properly configured Tricon TMR system, the 3805E is certified for use in Safety Integrity Level 3 (SIL 3) loops.
Explore Related Components
For detailed wiring diagrams and to source the 3805E alongside other Triconex safety hardware, please access our online technical database.
Recommended Similar Models
- TRICONEX 3805H (High-Current Analog Output variant)
- TRICONEX 3700A (TMR Analog Input Module)
- TRICONEX 3721 (Analog Input Module, 0-5V/0-10V)
- TRICONEX 3625 (Digital Output Module, 24V DC)
- TRICONEX 4351B (External Termination Interface)
