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Precision Phase Reference for SIL 2 Safety Applications
The Bently Nevada 3500/25-SIL2-02-01-R0 serves as a dual-channel Enhanced Keyphasor module within the 3500 series machinery protection system . This module accepts input signals from proximity probes or magnetic pickups and converts them into digital Keyphasor signals . Its half-height design measures 241 mm in height, 24.4 mm in width, and 242 mm in depth, fitting standard 3500 rack slots efficiently. The total weight reaches approximately 0.34 kg, offering a lightweight yet reliable solution for precision timing applications .
This module holds SIL 2 certification according to IEC 61508, making it suitable for safety-related applications up to this integrity level . The following table details the complete technical specifications for this Keyphasor module:
| Parameter | Specification |
|---|---|
| Product Brand | Bently Nevada |
| Product Model | 3500/25-SIL2-02-01-R0 |
| Product Category | Enhanced Keyphasor Module |
| Safety Integrity Level | SIL 2 (IEC 61508 certified) |
| Module Type | Half-height, 2-channel |
| Input Signals | Proximity probe or magnetic pickup |
| Input Voltage Range (Non-isolated) | +0.8V to -21.0V |
| Input Voltage Range (Isolated) | +5V to -11V |
| Power Consumption | 3.2 W typical |
| Buffered Outputs | 2 Keyphasor outputs |
| Output Impedance | 504 Ω maximum |
| Channel Power Supply | -24 VDC, 40 mA max per channel |
| Dimensions (H x W x D) | 241 mm x 24.4 mm x 242 mm |
| Weight | 0.34 kg |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -55°C to +95°C |
| Safety Certification | IEC 61508 SIL 2, TÜV Rheinland |
Signal Processing and Measurement Accuracy
The 3500/25-SIL2-02-01-R0 generates once-per-turn or multiple-event-per-turn pulses from rotating shafts . This precise timing measurement allows 3500 monitor modules to measure shaft rotative speed and vector parameters such as 1X vibration amplitude and phase . The module offers expanded Keyphasor signal processing capabilities over the previous design while maintaining complete downward compatibility with existing modules . Users benefit from enhanced diagnostic coverage and redundant design features that meet SIL 2 requirements .
System Configuration and Redundancy
The 3500 system can accept up to four Keyphasor signals for standard configurations and up to eight in paired configurations . For Triple Modular Redundant (TMR) applications, the system employs two Keyphasor modules working in parallel to provide both primary and secondary Keyphasor signals . The 3500/25-SIL2-02-01-R0 version features dual-channel input for redundancy, supporting high-integrity applications .
Safety Certification and Industrial Applications
The SIL 2 certification validates the module’s use in safety instrumented systems (SIS) for critical process applications . Widely used in power generation, petrochemical, and metallurgy industries, this module supports vibration monitoring of steam turbines, compressors, and pumps . Maintenance teams can therefore implement comprehensive protection strategies with verified safety integrity.