Description

The BENTLY NEVADA 3500/22M 138607-02 is a dual-channel vibration monitor module designed for continuous protection of turbomachinery in critical industrial applications. Part of the renowned 3500 Series rack-based monitoring system, this module processes signals from proximity probes (e.g., 3300 XL 8mm) to measure radial vibration, axial position, and speed with micron-level precision. The 3500/22M provides dynamic monitoring capabilities through its integrated peak-to-peak and gap voltage measurements, enabling early detection of imbalance, misalignment, and rotor-stator rub conditions in gas turbines, compressors, and steam turbines. Its fail-safe design features automatic sensor validation and channel redundancy to prevent false trips while ensuring compliance with API 670 standards for machinery protection.

Engineered for extreme environments, the module operates at -30°C to +65°C with 95% non-condensing humidity tolerance. The BENTLY NEVADA 3500/22M 138607-02 integrates seamlessly with the 3500 framework, supporting real-time data streaming to DCS/PLC systems via Modbus TCP, PROFIBUS, or OPC UA. Its modular hot-swappable design minimizes downtime during maintenance, while front-accessible DIP switches simplify calibration without rack removal. For predictive maintenance, the module’s buffered sensor outputs enable spectral analysis for fault diagnosis through System 1® software.

BENTLY NEVADA 3500/22M 138607-02

Technical Specifications

Main Features and Advantages

Advanced Fault Detection: Patented Dynamic Signal Averaging eliminates electrical noise from variable-speed machinery, enabling reliable measurement below 100 RPM. Integrated gap voltage monitoring detects probe degradation or cable faults before measurement drift occurs.

Reliability-Focused Design: Channel-to-channel isolation (>500V) prevents cross-talk during ground loops. Automatic Sensor OK validation inhibits alarms during probe failure, eliminating spurious shutdowns in critical processes.

Operational Flexibility: Front-panel DIP switches configure measurement units (µm/mils), filter settings (1–10 kHz), and alarm delays (0.1–10s). Non-volatile memory retains settings during power loss.

Predictive Maintenance Integration: Buffered raw outputs feed real-time vibration spectra to System 1® for early detection of bearing defects, resonance, and sub-synchronous vibrations.

Application Field

The BENTLY NEVADA 3500/22M 138607-02 is indispensable for high-value rotating assets:

Power Generation: Monovers steam turbine shaft vibration during fast startups, surviving steam chest temperatures up to 65°C.

Oil & Gas Compressors: Detects surge-induced vibration in centrifugal compressors with <5ms>

Petrochemical Pumps: Identifies cavitation-induced shaft deflection in API 610 pumps through sub-1Hz frequency analysis.

Marine Propulsion: Withstands 5g vibration in naval vessels while monitoring thrust bearing wear via axial position measurement.

Hydroelectric Turbines: Tracks rotor eccentricity during slow-roll conditions (<10>

BENTLY NEVADA 3500/22M 138607-02

Related Products

3500/15: Rack power supply module.

3500/25: Keyphasor® module for phase reference.

3300 XL 8mm Proximitor®: Eddy current probe.

3500/92: Communication gateway for Modbus TCP.

3500/33M: Triaxial vibration monitor.

3500/42M: Transient Data Interface for System 1®.

17025/46-01-00: Extension cable kit.

System 1® R5.10: Predictive diagnostics software.

Installation and Maintenance

Pre-installation preparation: Verify rack slot compatibility (3500/01 frame). Set probe gap voltage to -10±0.5V DC before power-up. Use shielded triaxial cables (e.g., 17025/46 series) with single-point grounding. Configure DIP switches for alarm latching/delay per API 670.

Maintenance recommendations: Calibrate annually with TK-3 calibrator. Monitor “Gap Voltage Deviation” trend for probe health. Replace modules after 10+ years or when relay contact resistance exceeds 0.5Ω. Clean card-edge connectors with isopropyl alcohol during turnarounds.