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Precision Timing and Phase Reference for SIL 2 Safety Applications
The Bently Nevada 3500/25-SIL2-01-01-R0 serves as an enhanced Keyphasor module within the 3500 series machinery protection system. This half-height, two-channel module provides critical timing and phase reference signals to monitor modules in a 3500 rack . The module receives input signals from proximity probes or magnetic pickups and converts them into digital Keyphasor signals that indicate when the Keyphasor mark on the shaft aligns with the transducer . Its robust construction measures 90 mm in height, 110 mm in width, and 110 mm in depth, fitting standard 3500 rack slots seamlessly . The total weight reaches approximately 1.2 kg, offering durability for demanding monitoring applications.
This module carries 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-SIL2-01-01-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) | 90 mm x 110 mm x 110 mm |
| Weight | 1.2 kg |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -55°C to +95°C |
| Safety Certification | IEC 61508 SIL 2, GB/T 20438-2017 |
Signal Processing and Measurement Accuracy
The 3500/25-SIL2-01-01-R0 provides highly accurate speed, phase angle, and position measurements for precise machinery monitoring. The module achieves an accuracy of ±0.05° and a resolution of 0.01°, ensuring reliable data for vibration analysis and fault diagnosis . This precision enables 3500 monitor modules and external diagnostic equipment to measure shaft rotative speed and vector parameters such as 1X vibration amplitude and phase . The enhanced design offers expanded Keyphasor signal processing capabilities while maintaining complete downward compatibility with existing modules .
System Configuration and Redundancy
The 3500 Machinery Protection System can accept up to four Keyphasor signals for normal configuration and up to eight Keyphasor signals in a paired configuration . For Triple Modular Redundant (TMR) applications, the system employs two Keyphasor modules working in parallel to provide both primary and secondary Keyphasor signals to other modules in the rack . This redundancy ensures continuous operation even during module maintenance or failure.
Safety Certification and Industrial Applications
The SIL 2 certification according to IEC 61508 validates the module’s use in safety instrumented systems (SIS) for critical process applications . The module complies with GB/T 20438-2017 for Chinese facilities, with the “-CN” suffix indicating local regulatory approval . Widely used in petrochemical, power generation, and metallurgy industries, this module supports vibration monitoring and fault diagnosis of rotating machinery such as steam turbines, compressors, and pumps .