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Product Introduction
The Bently Nevada 3500/25-01-01-00 Enhanced Keyphasor Module is a half-height, two-channel module designed to provide Keyphasor signals to monitor modules in a 3500 rack. It receives input signals from proximity probes or magnetic pickups and converts them into digital Keyphasor signals. These signals indicate when the Keyphasor mark on the shaft coincides with the Keyphasor transducer, allowing for precise timing measurements essential for monitoring shaft rotative speed and vector parameters such as 1X vibration amplitude and phase.
Product Specifications
| Parameter | Specification |
| Model Number | 3500/25-01-01-00 |
| Part Number | 149369-01 |
| Function | Enhanced Keyphasor Module |
| System Compatibility | Bently Nevada 3500 Series Rack |
| Number of Channels | Two-channel module |
| Input Signal Range | +0.8V to -21.0V (Non-isolated I/O modules); +5V to -11V (Isolated I/O modules) |
| Buffered Output Impedance | 504Ω maximum |
| Power Consumption | 3.2 Watts typical |
| Operating Temperature | –20°C to +65°C |
| Storage Temperature | –40°C to +85°C |
| Humidity Range | 0% to 95% non-condensing |
| Dimensions (D x W x H) | 119.9 x 24.4 x 256.5 mm |
| Weight | 0.34 kg |
| Mounting | Plugs directly into the 3500 rack |
| Agency Approvals | CSA/NRTL/C (Class 1, Div 2) |
Applications
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Machinery Condition Monitoring: Suitable for gas turbines, steam turbines, compressors, pumps, fans, and motors.
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Transient Data Acquisition: Captures and stores transient vibration events such as startups, shutdowns, trips, and other anomalies.
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Integration with System 1®: Seamless data streaming into Bently Nevada’s predictive analytics platform.
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Plantwide Monitoring Infrastructure: Acts as a centralized data gateway across multiple machinery systems.
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Diagnostics & Root Cause Analysis: Ideal for engineers seeking detailed, timestamped event data.
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Critical Asset Protection: Used across oil & gas, petrochemical, power generation, marine, and mining industries.
Advantages
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Enhanced Signal Processing: Employs advanced signal processing algorithms for improved noise immunity and accuracy.
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Dual-Channel Capability: Processes signals from two proximity probes or magnetic pickups simultaneously.
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Compact Design: Fits into a standard 19-inch rack, optimizing space utilization.
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High-Precision Keyphasing: Accurately determines the rotational position of a shaft relative to a fixed reference point.
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Broad Compatibility: Supports a range of Proximitors and advanced monitoring systems, ideal for diverse industrial applications.
Latest News Headlines
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“Bently Nevada Introduces Enhanced Keyphasor Module for Improved Machinery Monitoring”
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“New Developments in Keyphasor Technology Boost Rotating Equipment Analysis”
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“Enhanced Keyphasor Module Receives CSA/NRTL/C Certification for Hazardous Locations”
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“Bently Nevada’s 3500 Series Modules Gain Popularity in Power Generation Sector”
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“Advancements in Keyphasor Signal Processing Enhance Predictive Maintenance Strategies”
Frequently Asked Questions (FAQ)
1. What exactly does the 3500/25-01-01-00 module do in a monitoring system?
This module serves as a Keyphasor module, a critical component for vibration monitoring systems. It generates Keyphasor signals that indicate shaft position with high precision. These signals are used for calculating rotational speed, phase reference, and synchronous vibration measurements. It plays a key role in the diagnostics of rotating machinery, providing essential timing information needed by other 3500 monitoring modules.
2. What type of sensors can be connected to this Keyphasor module?
The 3500/25 module can be connected to proximity probes or magnetic pickups. It is designed to accept input signals from these transducers and convert them into usable Keyphasor signals. Compatibility includes standard eddy-current proximity probes commonly used in machinery condition monitoring.
3. Can the 3500/25 module handle multiple Keyphasor inputs?
Yes, the 3500/25-01-01-00 model supports dual-channel Keyphasor input. This allows it to handle two independent Keyphasor transducers simultaneously, which is especially useful for applications that involve redundant measurements or complex shaft arrangements requiring multiple phase references.
4. Is the 3500/25-01-01-00 interchangeable with other Keyphasor modules?
While the 3500/25 module is part of the broader 3500 series, it is specifically the Enhanced Keyphasor Module (P/N: 149369-01). It offers more advanced processing and higher performance than some older or legacy Keyphasor modules. Therefore, while interchangeable in terms of rack compatibility, careful configuration and validation should be done before replacement to ensure correct function.
5. How is this module configured and integrated into a 3500 rack?
The module slides directly into the 3500 rack system and uses the 3500 Configuration Software for parameter setup. You can configure input signal types, alarm limits, and communication parameters. It typically works in coordination with other modules like 3500/20 (Rack Interface Module) and 3500/22 (Transient Data Interface).
6. What role does the 3500/25 module play in transient event capture?
While the primary role of the 3500/25 is Keyphasor signal generation, these signals are foundational for transient data analysis. When paired with modules like the 3500/22M, it provides timing references during critical events like startups, shutdowns, or mechanical faults, enabling precise waveform capture and root cause analysis.
7. What happens if the Keyphasor signal is lost during operation?
Loss of the Keyphasor signal can disrupt synchronous measurements and potentially affect diagnostic accuracy. The 3500/25 module has self-diagnostic features that generate a system alarm if input signal is lost or degraded. In such cases, redundancy (dual input) or maintenance checks on probes and cabling are recommended.
8. Is there a way to check real-time Keyphasor performance or signal quality?
Yes, the module allows buffered output through a front-panel BNC connection. This enables technicians to use oscilloscopes or analyzers to view real-time signals, verify waveform integrity, and perform live diagnostics, which is especially useful during commissioning or troubleshooting.
9. What are the environmental tolerances of this module?
The 3500/25 module is ruggedly built for industrial environments. It operates within –20°C to +65°C and can be stored between –40°C to +85°C. It meets vibration, humidity, and EMI/EMC standards typical for control systems installed in hazardous and harsh conditions.
10. Can this module be used with System 1 condition monitoring software?
Yes, the Keyphasor signals generated by this module are fully compatible with System 1 by Bently Nevada, which is used for condition monitoring and predictive maintenance. When combined with the Transient Data Interface Module (3500/22M), it allows for synchronized waveform and phase data acquisition.
Related & Popular Models Recommendation
| Related / Same Series Models | Description |
| 3500/22M-01-01-01 | Transient Data Interface Module |
| 3500/20-01-00-00 | Rack Interface Module |
| 3500/42M-01-00 | Proximitor Monitor Module |
| 3500/40M-01-00 | Seismic Vibration Monitor |
| 3500/32M-01-00 | 4-Channel Relay Module |
| 3500/15-05-05-00 | Power Supply Module |
| Popular Bently Nevada Models | Description |
| 330104-00-05-10-02-00 | Proximity Probe, 5 m, 8 mm |
| 3300 XL NSv 330901-00-20-10-02-00 | Proximitor Sensor for tight spaces |
| 330130-040-00-00 | Extension Cable, 4.0 m |
| 3500/93-02-00-00 | Display Interface Module |
| 330180-91-05 | High-Temperature Proximity Probe |
| 1900/65A | Compact Vibration Monitor |
