Description
Technical Specifications
- Product Model: 3381
- Brand: TRICONEX
- Warranty: One Year
- Input Voltage: ±33 V DC max operating
- Operating Temperature: -40°C to +70°C
- Input Frequency Range: 0.5 Hz to 32 kHz
- Channels: 8 isolated (common ground), differential inputs
- Minimum Voltage (differential): 500 mV P-P (2 Hz-32 kHz); 1 V P-P (0.5-2 Hz)
- Resolution: 24 bits
- Sensor Types: Magnetic, active, open collector
- Protection Class: IP20 (rack-mounted)
- Accuracy Class: SIL 3 TMR pulse input
- Dimensions: Trident rack slot; ≈0.8 kg
Product Overview
The TRICONEX 3381 (PI3381) is an 8-channel TMR pulse input module for Trident Safety Instrumented Systems, capturing high-speed differential pulse signals from flowmeters, encoders, tachometers, and speed sensors in SIL 3 applications. Each channel processes magnetic, active, or open-collector signals up to 32 kHz through triple redundant paths with internal voting, ensuring measurement integrity despite single failures. Oil & gas, power, and chemical engineers use it for turbine speed monitoring, custody transfer flow, and compressor protection where precise frequency/period data feeds safety logic. 24-bit resolution and precision reference testing provide accurate RPM, flow rate, and totalization, while diagnostics detect signal loss, wiring faults, and channel degradation. Rack-mounted with hot-swap capability, it integrates seamlessly with Trident controllers for continuous high-availability operation in harsh process environments. (148 words)
Key Functions
High-Speed TMR Pulse Processing
8 independent channels capture 0.5-32 kHz signals through three redundant paths; mid-value voting rejects glitches while maintaining SIL 3 dangerous failure rates.
Flexible Sensor Interface
Differential inputs accept magnetic pickups (±33 VDC), active sensors, and open-collector outputs; 500 mV sensitivity handles low-amplitude signals reliably.
24-Bit Precision Measurement
High-resolution frequency/period counting with diagnostic reference testing verifies accuracy; supports RPM, flow rate, and totalizer calculations for safety logic.
Comprehensive Channel Diagnostics
Real-time monitoring flags signal loss, wiring opens/shorts, and internal faults; PASS/FAULT/ACTIVE LEDs enable rapid troubleshooting during inspections.
Application Scenarios
Turbine Overspeed Protection
Power plants monitor high-speed turbine gears; 32 kHz bandwidth captures overspeed events while TMR rejects pickup noise during vibration transients.
Custody Transfer Flowmeters
Gas metering stations totalize pulse outputs; 24-bit resolution ensures billing accuracy while diagnostics verify meter health during SIL proof tests.
Compressor Surge Control
Refineries track impeller speeds; minimum 500 mV sensitivity handles weak magnetic signals while channel isolation prevents cross-talk.
Pump Vibration Monitoring
Offshore platforms measure bearing speeds; hot-swap capability supports online replacement without losing critical machinery protection coverage.
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