Bently Nevada 3300/20 Keyphasor Module | Phase Reference Signal Conditioner for Vibration Monitoring

Bently Nevada 3300/20-11-01-02-00-02 Keyphasor Module

Essential timing reference module for rotating machinery analysis. The Bently Nevada 3300/20-11-01-02-00-02 processes once-per-revolution signals from keyphasor probes, providing the phase reference data critical for vibration analysis, balancing operations, and diagnostic procedures.

? Module Specifications

Full Part Number: 3300/20-11-01-02-00-02
Function: Keyphasor Signal Conditioner
Series: 3300 Monitoring System
Input Type: Proximity probe or magnetic pickup
Output Signal: TTL-compatible pulse (0-5V)
Pulse Width: Adjustable (10-90% duty cycle)
Frequency Range: 0.1 Hz to 20 kHz
Power Supply: -24 VDC ±5%
Current Consumption: 30 mA typical
Operating Temperature: -30°C to +65°C
Response Time: <1 millisecond
Output Channels: Multiple buffered outputs

? Why Keyphasor Matters

Without accurate phase reference, vibration data loses critical context. The keyphasor module transforms a simple once-per-turn mark into precise timing intelligence that enables:

Vibration Phase Analysis: Determine whether unbalance is in the coupling, impeller, or rotor by comparing vibration phase to shaft position—impossible without keyphasor reference.

Balancing Operations: Calculate exact weight placement angles for single-plane and two-plane balancing procedures, reducing trial-and-error and minimizing downtime.

Orbit Generation: Create shaft centerline orbit plots that reveal rubs, misalignment, and looseness by synchronizing X-Y vibration data to rotational position.

Order Tracking: Separate synchronous vibration (1X, 2X, 3X running speed) from non-synchronous phenomena like bearing defects and resonances.

⚙️ Technical Features

✓ Universal Input: Accepts signals from proximity probes, magnetic pickups, and optical sensors
✓ Adjustable Threshold: User-configurable trigger level accommodates varying signal amplitudes
✓ Multiple Outputs: Buffered outputs drive multiple instruments simultaneously
✓ Noise Immunity: Advanced filtering rejects electrical interference and false triggers
✓ LED Indicators: Visual confirmation of power, signal presence, and pulse output

? Real-World Applications

Turbine Balancing: Field balancing of gas turbines requires precise phase measurements—this module provides the reference that balancing software needs to calculate correction weights and angles with single-run accuracy.

Compressor Diagnostics: When analyzing compressor vibration signatures, keyphasor data reveals whether problems are synchronous (unbalance, misalignment) or asynchronous (bearing wear, aerodynamic instability).

Motor Analysis: Detect rotor bar defects, eccentricity, and coupling issues by examining vibration amplitude and phase relative to shaft position across the speed range.

? System Integration

The 3300/20-11-01-02-00-02 integrates seamlessly with 3300 series proximitors, 3500 rack systems, and standalone analyzers. Its TTL-compatible outputs connect directly to data acquisition systems, PLCs, and vibration analyzers without signal conditioning.

Install one keyphasor module per shaft—it distributes the timing reference to all monitoring channels on that machine, ensuring phase-coherent measurements across multiple sensors and instruments.

? Complete Package

One 3300/20-11-01-02-00-02 keyphasor module, mounting hardware, terminal blocks, configuration guide, and factory test certificate. Compatible with all Bently Nevada keyphasor probes and magnetic pickups.

Product Condition: Brand new, factory-sealed with full manufacturer warranty and technical support.