Introduction
The Bently Nevada 330525-02-00 Velomitor XA Piezo-Velocity Sensor is a rugged industrial vibration sensor designed for absolute casing and bearing-housing vibration measurement on rotating machinery.
The Velomitor XA family uses solid-state piezoelectric technology to provide a direct velocity output without the moving mechanical elements found in conventional velocity transducers. This makes the sensor well suited to continuous machinery-condition monitoring where dependable vibration measurement, compact construction, and straightforward installation are important.
The 330525-02-00 combines the Velomitor XA sensing platform with a 1/4-28 UNF mounting configuration. Its robust construction and broad measurement capability make it a strong candidate for monitoring pumps, motors, compressors, fans, gearboxes, turbines, generators, and other critical rotating assets.
Technical Specifications
The 330525-02-00 is part of the Bently Nevada Velomitor XA series. The configuration is intended for applications requiring a compact piezoelectric velocity sensor with an established industrial mounting arrangement.
| Specification | 330525-02-00 |
|---|
| Manufacturer | Bently Nevada |
| Product Family | Velomitor XA |
| Product Type | Piezo-Velocity Sensor |
| Model | 330525-02-00 |
| Sensing Technology | Solid-state piezoelectric |
| Measurement | Absolute vibration velocity |
| Mounting Thread | 1/4-28 UNF |
| Nominal Sensitivity | 100 mV/in/s |
| Metric Sensitivity | Approx. 3.94 mV/mm/s |
| Frequency Response | Approx. 4.5 Hz to 5 kHz |
| Typical Response Tolerance | ±3 dB |
| Maximum Velocity Range | Approx. 50 in/s peak |
| Equivalent Metric Range | Approx. 1270 mm/s peak |
| Transverse Sensitivity | Less than 5% |
| Housing Material | Stainless steel |
| Construction | Hermetically sealed |
| Operating Temperature | Approx. -55°C to +121°C |
| Connector | Industrial coaxial/compatible sensor connector |
| Mounting Configuration | 1/4-28 UNF |
| Sensor Type | Absolute vibration sensor |
| Approx. Diameter | 25 mm |
| Approx. Height | 60–65 mm |
| Approx. Weight | 140–160 g |
Applications
The 330525-02-00 is designed for applications in which vibration velocity provides a useful representation of machine condition.
It can be used for:
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Motor bearing-housing vibration monitoring
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Pump vibration monitoring
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Compressor casing monitoring
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Fan and blower vibration measurement
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Generator vibration monitoring
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Gearbox casing monitoring
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Turbine auxiliary-equipment monitoring
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Bearing housing condition monitoring
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Industrial rotating machinery diagnostics
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Continuous condition-monitoring systems
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Machinery vibration trending
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General plant equipment protection
Velocity measurement is particularly useful for evaluating overall machinery vibration severity. When installed correctly, the Velomitor XA can provide a stable signal for trending changes in machine condition over time.
For larger machinery-monitoring installations, the sensor can be integrated with compatible vibration-monitoring equipment to provide continuous measurement rather than relying solely on periodic manual inspection.
Advantages
Solid-State Piezoelectric Design
The Velomitor XA uses solid-state piezoelectric sensing technology, avoiding the moving mechanical assemblies associated with conventional moving-coil velocity sensors.
This construction supports long-term stability and helps reduce mechanical wear concerns.
Direct Velocity Measurement
The sensor provides a velocity-based vibration signal, making it convenient for machinery condition monitoring where vibration severity is commonly evaluated in velocity units.
1/4-28 UNF Mounting
The 1/4-28 UNF mounting thread provides a compact mechanical interface for installations where space is limited or where this mounting standard is already incorporated into the machinery mounting arrangement.
Broad Frequency Coverage
With a frequency response extending from approximately 4.5 Hz to 5 kHz, the sensor covers a broad range of vibration frequencies encountered in industrial rotating machinery.
High Measurement Capacity
The approximately 50 in/s peak measurement capability gives the sensor substantial headroom for machinery operating under elevated vibration conditions.
Compact Construction
The relatively small cylindrical housing makes the Velomitor XA attractive for installations where larger vibration sensors would be difficult to accommodate.
Rugged Industrial Housing
The stainless-steel housing and sealed construction provide a durable package for continuous operation in demanding machinery environments.
Flexible Installation
The solid-state sensing principle allows the sensor to be installed in different orientations without the same orientation restrictions associated with conventional mechanical velocity transducers.
Low Transverse Sensitivity
The sensor is designed to limit response to vibration perpendicular to the principal measurement axis, helping improve measurement consistency where machinery vibration occurs in several directions.
Useful for Continuous Trending
The stable velocity output makes the 330525-02-00 particularly useful for condition-based maintenance, where vibration values are monitored over time to identify deterioration before a major machinery problem develops.
Technical FAQs
1. What is the Bently Nevada 330525-02-00?
The 330525-02-00 is a Velomitor XA solid-state piezoelectric velocity sensor designed to measure absolute vibration on rotating machinery casings, bearing housings, and structural surfaces.
2. What does Velomitor XA mean?
Velomitor XA identifies a Bently Nevada family of piezoelectric velocity sensors designed for industrial machinery vibration measurement. The solid-state architecture eliminates the moving components associated with traditional moving-coil velocity transducers.
3. What mounting thread does the 330525-02-00 use?
This configuration uses a 1/4-28 UNF mounting thread.
4. What is the nominal sensitivity?
The nominal sensitivity is approximately 100 mV/in/s, equivalent to about 3.94 mV/mm/s.
5. What is the frequency response?
The sensor provides a broad frequency response of approximately 4.5 Hz to 5 kHz, making it suitable for general rotating-equipment vibration monitoring.
6. What is the maximum vibration velocity range?
The nominal measurement capability is approximately 50 in/s peak, equivalent to approximately 1270 mm/s peak.
7. Where is this sensor normally installed?
Typical installation locations include motor bearing housings, pump casings, compressor housings, fan housings, gearboxes, generators, and other machinery structures where absolute vibration measurement is required.
8. Is the 330525-02-00 suitable for hazardous areas?
The approval status should be verified against the exact supplied configuration and the requirements of the installation. Do not assume that all Velomitor XA configurations have identical hazardous-area certifications.
9. What are the approximate dimensions and weight?
The sensor body is approximately 25 mm in diameter and roughly 60–65 mm high, with an approximate weight of 140–160 g before additional mounting hardware or packaging.
10. What should be checked before replacing an existing sensor?
Check the 330525 series, mounting thread, sensitivity, frequency response, connector, cable arrangement, physical dimensions, approval requirements, and monitoring-system compatibility. A sensor that appears physically similar may not provide the same electrical or mechanical configuration.
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