Introduction
The Bently Nevada 330500-07-02 Velomitor Piezo-velocity Sensor is a solid-state vibration sensor designed for reliable measurement of absolute vibration velocity on rotating machinery and structural surfaces.
Built around piezoelectric sensing technology, the Velomitor family eliminates the moving mechanical elements found in conventional moving-coil velocity transducers. This gives the 330500-07-02 a rugged, compact design that is well suited to continuous industrial vibration monitoring.
This particular configuration combines a 3/8-16 UNC mounting interface with a -02 approval configuration, making it a practical choice for machinery installations where this mounting arrangement and certification package are required. The sensor is commonly considered for pumps, motors, compressors, turbines, generators, fans, and other rotating equipment where dependable casing or bearing-housing vibration information is important.
Technical Specifications
The 330500-07-02 belongs to the 330500 Velomitor sensor family. The model configuration identifies the mechanical mounting and agency-approval options, while the core sensor provides a nominal velocity sensitivity suitable for industrial machinery-monitoring systems.
| Specification | 330500-07-02 |
|---|
| Manufacturer | Bently Nevada |
| Product Family | Velomitor |
| Product Type | Piezoelectric Velocity Sensor |
| Model | 330500-07-02 |
| Sensing Technology | Solid-state piezoelectric |
| Measurement Type | Absolute vibration velocity |
| Mounting Thread | 3/8-16 UNC |
| Nominal Sensitivity | 100 mV/in/s (3.94 mV/mm/s) |
| Sensitivity Tolerance | ±5% |
| Frequency Response | Approx. 4.5 Hz to 5 kHz |
| Response Accuracy | ±3 dB |
| Extended Flat Response | Approx. 6 Hz to 2.5 kHz |
| Maximum Velocity | 50 in/s peak (1270 mm/s peak) |
| Amplitude Linearity | ±2% to 6 in/s peak |
| Transverse Sensitivity | Less than 5% |
| Mounted Resonant Frequency | Greater than 12 kHz |
| Broadband Noise Floor | Approx. 0.004 mm/s RMS |
| Output Bias Voltage | -12 Vdc ±3 V |
| Nominal Supply | -24 Vdc |
| Typical Bias Current | 2 mA |
| Dynamic Output Impedance | Less than 2400 Ω |
| Operating Temperature | -55°C to +121°C |
| Case Material | 316L stainless steel |
| Housing | Hermetically sealed |
| Connector | 2-pin MIL-C-5015 |
| Case Isolation | Electrically isolated |
| Mounting Configuration | 3/8-16 UNC |
| Approx. Sensor Diameter | 25.3 mm |
| Approx. Sensor Height | 63.2 mm |
| Approx. Sensor Weight | 142 g |
| Approx. Assembled Weight | 180–200 g, depending on mounting hardware |
Applications
The 330500-07-02 is intended for applications where absolute casing or structural vibration velocity is an important indicator of machinery condition.
Typical applications include:
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Steam turbine casing vibration monitoring
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Gas turbine vibration monitoring
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Compressor bearing-housing monitoring
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Motor vibration measurement
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Generator vibration monitoring
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Pump casing vibration monitoring
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Fan and blower monitoring
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Gearbox vibration monitoring
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Bearing housing condition monitoring
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Rotating machinery diagnostics
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Industrial vibration surveys
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Continuous machinery condition monitoring
The sensor can be mounted directly to a suitable machinery surface and used to monitor changes in vibration severity over time.
Its broad frequency response makes it useful for general machine vibration as well as applications where higher-frequency vibration components need to be captured.
Advantages
Solid-State Sensor Architecture
The 330500-07-02 uses solid-state piezoelectric technology, avoiding the moving mechanical components found in traditional velocity transducers. This helps provide a robust sensor package for long-term industrial use.
3/8-16 UNC Mounting
The 3/8-16 UNC mounting thread provides a strong and practical mechanical connection for installations designed around this mounting standard.
This is an important distinction when replacing an existing Velomitor because sensors with different mounting threads are not automatically mechanically interchangeable.
Wide Measurement Bandwidth
The approximately 4.5 Hz to 5 kHz frequency response allows the sensor to monitor a broad range of vibration activity.
For many rotating-machinery applications, this provides useful coverage from low-frequency machine movement through higher-frequency vibration components.
High Vibration Capacity
With a measurement capability of up to approximately 50 in/s peak, the sensor can accommodate substantial vibration levels without being limited to low-amplitude machinery applications.
Rugged Stainless-Steel Housing
The 316L stainless-steel housing provides a durable enclosure for the internal electronics and sensing element. The hermetically sealed construction is especially valuable for permanently installed industrial sensors.
Flexible Mounting Orientation
Because the Velomitor is a solid-state piezoelectric sensor, it does not rely on a moving mass whose position is affected by gravity in the same way as traditional mechanical velocity transducers.
This allows greater flexibility when determining the most practical mounting orientation.
Low Transverse Sensitivity
The sensor is designed to maintain low sensitivity to vibration occurring perpendicular to its primary measurement axis. This helps maintain measurement integrity where multi-directional machinery vibration is present.
Low Noise Floor
The low broadband noise floor makes the sensor suitable for detecting relatively small vibration levels while still retaining substantial measurement range for higher-vibration machinery.
Industrial Temperature Range
The specified operating range of approximately -55°C to +121°C (-67°F to +250°F) supports installation across a broad range of industrial machinery environments.
Practical Condition-Monitoring Solution
The compact form factor, solid-state construction, broad frequency response, and direct velocity output make the 330500-07-02 an attractive option for users who want straightforward integration into an existing machinery vibration-monitoring architecture.
Technical FAQs
1. What is the Bently Nevada 330500-07-02?
The 330500-07-02 is a Velomitor piezoelectric velocity sensor designed to measure absolute vibration velocity on machinery casings, bearing housings, and other structural surfaces.
2. What mounting thread does the 330500-07-02 use?
This configuration uses a 3/8-16 UNC mounting thread.
3. What is the sensor sensitivity?
The nominal sensitivity is approximately 100 mV/in/s, equivalent to 3.94 mV/mm/s, with a typical tolerance of ±5%.
4. What frequency range does it measure?
The nominal frequency response is approximately 4.5 Hz to 5 kHz at ±3 dB, providing broad coverage for industrial machinery vibration.
5. What is the maximum velocity range?
The sensor can measure vibration velocity up to approximately 50 in/s peak, equivalent to 1270 mm/s peak.
6. Is the Velomitor a moving-coil velocity sensor?
No. The Velomitor uses a solid-state piezoelectric sensing principle. It does not rely on the moving mechanical coil and magnet arrangement used by traditional moving-coil velocity transducers.
7. What is the operating temperature range?
The specified operating range is approximately -55°C to +121°C (-67°F to +250°F).
8. What are the approximate dimensions?
The sensor body is approximately 25.3 mm in diameter and 63.2 mm in height. The final installed dimensions depend on the mounting arrangement and hardware.
9. How much does the sensor weigh?
The basic sensor weighs approximately 142 g. With associated mounting hardware, the assembled configuration is approximately 180–200 g, depending on the exact supplied configuration.
10. What should be checked before ordering a replacement?
Confirm the 330500 series, 3/8-16 UNC mounting thread, approval configuration, sensitivity, frequency response, connector arrangement, power requirements, cable compatibility, and physical mounting surface. A Velomitor with a different mounting or approval configuration should not automatically be considered a direct replacement.
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