Description
Technical Specifications
- Product Model: 3805E
- Brand: TRICONEX
- Warranty: One Year
- Input Voltage: +24 VDC nominal
- Operating Temperature: 0°C to +60°C (32°F to 140°F)
- Storage Temperature: -40°C to +85°C
- Response Time: <10 ms switch time on leg failure
- Protection Class: IP20
- Accuracy Class: <0.25% of FSR (0-21.2 mA)
- Output Frequency: DC steady-state analog
- Rated Current Range: 4-20 mA (+6% overrange); 250-1000 Ω loads
- Communication Interface: Tricon backplane; External Termination Panel (ETP) required
- Supported Protocols: TMR voting; HART pass-through capable
- Overload Capacity: +42.5 VDC continuous over-range protection
- Dimensions: 16 cm × 16 cm × 12 cm; 0.8 kg
Product Overview
The TRICONEX 3805E is an enhanced 8-channel TMR analog output module for Tricon safety systems, delivering precise 4-20 mA control signals to valves, actuators, and positioners in SIL-rated applications. It receives identical commands from three main processors, votes to select the median value, and drives field devices through common-return DC-coupled outputs with self-calibration via loopback circuits. Process control engineers in oil & gas, chemicals, and power generation benefit from its fault tolerance—faulty channels auto-disable while healthy outputs maintain control—and <10 ms switchover during failures. Requiring external loop power and ETP panels, the 3805E supports loads up to 1000 Ω with LOAD fault detection for opens/shorts. Dual power inputs with indicators ensure continuous operation, while 12-bit resolution and <0.25% accuracy provide reliable setpoint tracking in demanding process loops. Hot-swappable design minimizes maintenance downtime in continuous operations. (158 words)
Key Functions
TMR Voting and Fault Tolerance
Three processor channels send identical 12-bit commands; module votes median value for output while diagnostics disable faulty legs. Switchover occurs in <10 ms, preserving process control during single-channel failures. Ensures SIL integrity without process upset.
Self-Calibrating Loopback
Internal current loopback verifies output accuracy independently of channel selection, maintaining <0.25% precision across 0-60°C. Reduces field calibration needs and drift in long-term deployments.
Load Fault Detection
LOAD indicators signal open loops or shorts; over-range protection handles +6% excursions to 21.2 mA. Protects actuators while alerting operators to wiring issues before failures cascade.
Flexible Loop Powering
External +24-42.5 VDC loop power supports 250-1000 Ω loads; reverse polarity protection prevents damage. Common-return design simplifies field wiring versus fully isolated outputs.
Application Scenarios
ESD Valve Control
Refineries drive emergency shutdown valves with 3805E outputs; TMR voting rejects faulty processor signals while HART pass-through enables signature testing. <10 ms switchover prevents partial strokes during proof tests.
HIPPS Final Elements
Gas plants position High-Integrity Pressure Protection actuators; self-calibration maintains 0.25% accuracy under temperature swings. Load detection confirms response during annual SIL verification.
Turbine Speed Governors
Power stations control governor servos; 8 channels handle multiple axes with 1000 Ω compatibility for long cable runs. Fault isolation sustains load-following despite single-channel degradation.
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