Triconex 3511 high‑precision Pulse Input (PI) module
The Triconex 3511 is a high‑precision Pulse Input (PI) module designed for Triconex Triple Modular Redundancy (TMR) Safety Instrumented Systems (SIS), now part of Schneider Electric. It is engineered to monitor high‑frequency pulse signals from magnetic speed sensors, delivering accurate speed/RPM measurements for critical rotating machinery in safety‑critical applications.
Key Applications
- Turbine & Compressor Monitoring: Precise RPM/speed measurement for gas/steam turbines, centrifugal compressors, and expanders in oil & gas, power generation, and petrochemicals.
- Emergency Shutdown Systems (ESD): Speed‑overspeed protection and trip logic for critical rotating equipment to prevent catastrophic failures.
- Fire & Gas Systems (FGS): Monitoring of flame scanner pulses and gas detector relay outputs for safety interlocks.
- Process Safety: High‑accuracy flow measurement via pulse transmitters in pipelines, blending, and batch processes.
- Critical Infrastructure: Safety monitoring for power plant auxiliaries, mining conveyors, and offshore platform machinery.
Core Specifications
| Category | Specification |
|---|---|
| Model | 3511 |
| Manufacturer | Triconex (Schneider Electric) |
| Product Type | TMR Pulse Input Module (Speed Measurement) |
| Input Channels | 8 non‑commoned, galvanically isolated channels |
| Signal Compatibility | Non‑amplified magnetic speed sensors (sine/square/pulse waveforms) |
| Frequency Range | 1 Hz to 100 kHz |
| Resolution | 16‑bit; 1 μs pulse width resolution |
| Accuracy | ±0.01% (1 kHz–20 kHz); ±0.05% (20 kHz–100 kHz) |
| Input Voltage | 1.5–200 V peak‑to‑peak; ±150 VDC continuous overrange protection |
| Impedance | >8 kΩ (20 kΩ typical) |
| Update Rate | 25 ms (typical) |
| Backplane Interface | Tricon TMR backplane (compatible with Tricon v9/v10/v11 SIS) |
| Redundancy | Triple‑Modular Redundancy (TMR), 2‑out‑of‑3 voting |
| Safety Certifications | SIL 3 (IEC 61508/61511), TÜV, ATEX, IECEx |
| Operating Temperature | −40°C to +70°C (−40°F to 158°F) |
| Storage Temperature | −40°C to +85°C (−40°F to 185°F) |
| Humidity | 5–95% non‑condensing |
| Dimensions (W×H×D) | 310 mm × 260 mm × 35 mm (12.2” × 10.2” × 1.4”) |
| Weight | ~0.8 kg (1.8 lbs) |
| Status | Active (in production) |
Key Features
- TMR Fault Tolerance: Triple‑modular redundancy eliminates single points of failure, ensuring data integrity and system availability for SIL 3 applications.
- High‑Frequency Precision: 1 μs resolution and 100 kHz bandwidth deliver accurate speed measurement for high‑speed rotating equipment.
- Wide Signal Compatibility: Works with unamplified magnetic sensors, reducing wiring and cost in hazardous areas.
- Comprehensive Diagnostics: Built‑in open/short‑circuit detection, overrange monitoring, and channel health reporting for predictive maintenance.
- Rugged Industrial Design: Extended temperature range, vibration resistance, and EMI shielding suit harsh environments (offshore, refineries, plants).
Triconex 8110 module rack, Triconex 8111 expansion chassis, Triconex 8121 expansion chassis rack. Power modules 8310, 8311, 8312. Main processor module Triconex 3008, Tricon communication module (TCM), Ethernet (802.3) and serial (RS-232/RS-485) ports Triconex 4351A, Triconex 4352A, Triconex 4351B, Triconex 4352B, Triconex 4353, Triconex 4354. Remote expansion module, interface module, digital input module. Mainly used for emergency shutdown (ESD), fire protection and gas protection (F&G), burner management (BMS), high integrity pressure protection (HIPPS) and turbine mechanical control (TMC).
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