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Product Introduction
The Bently Nevada 3500/25-01-01-04-01 Enhanced Keyphasor Module is a high-performance signal processing unit designed for advanced rotor position and speed monitoring. As part of the 3500 Series Machinery Protection System, this module provides precise detection of keyphasor signals from rotating machinery, enabling accurate measurement of shaft speed, phase reference, and vibration timing.
The enhanced design improves signal discrimination under high-speed and high-vibration conditions, ensuring reliable operation even in noisy industrial environments. The module works in conjunction with proximity probes, magnetic pickups, or optical sensors, providing a stable, phase-locked reference for vibration analysis and machinery diagnostics. It is commonly used in turbines, compressors, pumps, and generators where accurate rotational information is critical for monitoring and protection.
This module is compatible with other 3500 Series modules, allowing integration into centralized or distributed monitoring systems for machinery protection, alerting operators to imbalance, misalignment, or abnormal operating conditions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 3500/25-01-01-04-01 |
| Module Type | Enhanced Keyphasor Module |
| System Compatibility | Bently Nevada 3500 Series |
| Signal Input | Proximity Probe, Magnetic Pickup, or Optical Sensor |
| Output | Digital Keyphasor Pulse, Analog Speed Signal |
| Frequency Range | DC to 20 kHz |
| Phase Accuracy | ±0.5 degrees |
| Input Voltage Range | 0–30 V peak for magnetic sensors, 0–24 V for proximity probes |
| Temperature Range | –20°C to +70°C (operating) |
| Power Consumption | 3 W typical |
| Module Slot Size | Standard 3500 Series 1/4-width module |
| Isolation | Galvanically isolated input and output |
| Response Time | <1 ms for keyphasor pulse detection |
| Output Current | 10 mA max per digital output |
| Weight | 0.34 kg |
| Dimensions (L × W × H) | 119.9 x 24.4 x 256.5 mm |
| Mounting | 19-inch 3500 rack compatible |
Product Applications
The 3500/25 Enhanced Keyphasor Module is used to provide accurate rotational reference and speed data in critical machinery protection systems. Applications include:
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Turbines: Provides phase reference for vibration analysis and speed measurement.
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Compressors: Monitors shaft speed and keyphasor signals for imbalance detection.
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Pumps: Supplies phase-locked reference for vibration trend monitoring.
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Generators: Synchronizes rotor position for condition monitoring and diagnostics.
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Gearboxes: Tracks rotational speed and phase for early detection of misalignment or gear defects.
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Integrated Machinery Protection Systems: Works with 3500 Series vibration modules to provide comprehensive monitoring of critical plant equipment.
The module ensures reliable keyphasor signals under varying operational speeds and high-noise conditions, enabling accurate trending, machinery diagnostics, and fault prevention.
Product Advantages
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Enhanced Signal Processing: Provides improved discrimination of keyphasor pulses in noisy environments.
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High Accuracy: Phase accuracy of ±0.5° ensures precise speed and vibration timing measurement.
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Versatile Sensor Compatibility: Works with proximity probes, magnetic pickups, and optical sensors.
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Fast Response: Detects keyphasor pulses in less than 1 ms for rapid fault detection.
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Galvanic Isolation: Prevents ground loops and ensures stable signal transmission.
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Low Power Consumption: Operates efficiently within typical 3500 rack power budgets.
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Compact Design: Standard quarter-width module fits neatly in the 3500 rack.
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Broad Frequency Range: Supports signals from DC to 20 kHz for diverse machinery speeds.
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Integrated System Support: Fully compatible with other 3500 Series modules for complete machinery monitoring.
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Robust Industrial Construction: Designed for reliable operation in harsh plant environments.
FAQ
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What types of sensors are compatible with the 3500/25 Enhanced Keyphasor Module?
It supports proximity probes, magnetic pickups, and optical sensors, providing flexibility for different machinery setups. -
What is the phase accuracy of the module?
The module provides phase accuracy of ±0.5 degrees, ensuring precise timing reference for vibration analysis. -
What output signals does the module provide?
It provides a digital keyphasor pulse and an analog speed signal compatible with other 3500 Series modules. -
What frequency range can the module handle?
It can process signals from DC up to 20 kHz, accommodating both low-speed and high-speed rotating machinery. -
How quickly does the module respond to keyphasor pulses?
The response time is less than 1 millisecond, providing rapid detection for fault monitoring. -
Is the module isolated from the rack and other inputs?
Yes, the module features galvanic isolation for both input and output circuits, preventing ground loop interference. -
Can the module operate at high ambient temperatures?
It is rated for operating temperatures from –20°C to +70°C, suitable for typical industrial environments. -
What is the maximum input voltage the module can accept from a sensor?
It accepts up to 30 V peak for magnetic pickups and up to 24 V for proximity probe signals. -
Is the module compatible with older 3500 Series racks?
Yes, it fits standard 3500 Series quarter-width module slots and interfaces with existing rack systems. -
Can the module provide speed measurement for machinery with variable RPM?
Yes, the module accurately tracks keyphasor pulses across variable rotational speeds, ensuring reliable phase and speed data.
Related Models (Same Series)
| Model Number | Description |
|---|---|
| 3500/25-01-01-01 | Standard Keyphasor Module with basic features |
| 3500/25-01-01-02 | Enhanced Keyphasor with improved pulse filtering |
| 3500/25-01-01-03 | Keyphasor module optimized for high-speed turbines |
| 3500/25-01-02-01 | Dual-channel keyphasor for multi-shaft systems |
| 3500/25-01-03-01 | Keyphasor module with integrated speed output |
| 3500/25-02-01-01 | High-sensitivity keyphasor module for low-vibration machinery |
Popular Models from the Same Brand (Bently Nevada)
| Model Number | Description |
|---|---|
| 3300/45M | 4-channel vibration monitor module |
| 3500/22M | Communication gateway for 3500 Series modules |
| 3500/42M | Four-channel vibration and position monitor |
| 3500/60 | Speed/phase module with tachometer integration |
| 3300/60 | Advanced proximity sensor for NSv or XL systems |
| 3500/40 | Machinery monitoring module with alarm outputs |
