Product Overview

The Bently Nevada 3500/25 is a high-performance, half-height, two-channel module designed to provide critical phase reference and timing signals to the 3500 Machinery Protection System. By processing input from proximity probes or magnetic pickups, the Enhanced Keyphasor Module detects once-per-turn (or multi-pulse) marks on a rotating shaft. This data is converted into precise digital timing pulses used by other monitor modules within the rack to perform complex vector measurements, such as 1X vibration amplitude and phase lag.

This module is a fundamental building block for Turbine Supervisory Instrumentation (TSI). It enables advanced machinery diagnostics by providing the baseline synchronization required for orbit plots, Bode plots, and polar plots. The 3500/25 is engineered to deliver superior signal processing while remaining fully compatible with legacy 3500 system architectures.

Key Technical Characteristics

• Dual-Channel Processing: Features two independent channels capable of accepting signals from various transducer types, including proximity probes and magnetic pickups.

• Precision Rotational Speed: Delivers highly accurate speed measurements with a rated accuracy of ±0.1% of the reading, even during rapid machinery transients.

• Vector Signal Integration: Provides the essential timing reference that allows vibration monitors to calculate phase-related parameters, critical for balancing and identifying rotor malfunctions.

• Redundancy and Reliability: Supports Triple Modular Redundant (TMR) configurations when installed in paired sets, ensuring high availability for mission-critical machinery protection.

• Enhanced Signal Conditioning: Offers improved filtering and signal processing compared to standard Keyphasor modules, increasing immunity to noise and signal jitter.

• Hot-Swappable Design: Can be removed or replaced while the rack is powered without interrupting the operation of other monitor modules, facilitating easy maintenance.

Hardware Parameters and Specifications

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Number: 3500/25

• Module Type: Enhanced Keyphasor Module (Half-height)

• Inputs: 2 non-isolated Keyphasor signals

• Input Impedance: 20 kΩ (Standard)

• Speed Accuracy: ±0.1% of reading

• Power Consumption: 3.2 Watts (Typical)

• Operating Temperature: -30°C to +65°C

• Storage Weight: 0.06 kg

• HS Code: 8537101190

• System Type: 3500 Series Rack System

Industrial Application Areas

• Power Generation: Accurate phase monitoring for steam and gas turbine generators.

• Oil and Gas: Vital timing reference for high-speed centrifugal compressors and turbo-expanders.

• Machine Diagnostics: Essential for personnel using Bently Nevada System 1 software to perform root-cause analysis and rotor dynamics studies.

• Emergency Shutdown Systems: Providing the speed and phase data required for automatic machinery protection and trip logic.