Introduction
The Bently Nevada 330500-06-00 Velomitor Piezoelectric Velocity Sensor is a solid-state vibration sensor designed for measuring absolute casing, bearing-housing, and structural vibration on industrial rotating machinery.
Part of the proven Velomitor sensor family, the 330500-06-00 combines integrated electronics with a rugged, hermetically sealed 316L stainless-steel housing. Its factory-installed 5/8-18 UNF mounting adapter makes it particularly suitable for installations requiring a larger, robust mounting interface.
Unlike traditional moving-coil velocity transducers, the Velomitor uses piezoelectric sensing technology with no moving mechanical components. This construction supports reliable operation, flexible mounting orientation, and long service life in demanding machinery-monitoring environments.
The 330500-06-00 is intended for non-hazardous-area installations and provides a nominal sensitivity of 100 mV/in/s (3.94 mV/mm/s) with a broad 4.5 Hz to 5 kHz frequency response. It is a strong choice for users looking for a compact, high-performance velocity sensor for continuous vibration monitoring.
Technical Specifications
The 330500-06-00 is configured with the 5/8-18 UNF mounting option and the -00 agency approval option, meaning no hazardous-area approval is specified for this particular configuration.
| Specification | 330500-06-00 |
|---|
| Manufacturer | Bently Nevada |
| Product Family | Velomitor |
| Product Type | Piezoelectric Velocity Sensor |
| Model Number | 330500-06-00 |
| Sensing Technology | Solid-state piezoelectric |
| Measurement | Absolute vibration velocity |
| Mounting Thread | 5/8-18 UNF |
| Sensitivity | 100 mV/in/s (3.94 mV/mm/s) ±5% |
| Frequency Response | 4.5 Hz to 5 kHz, ±3 dB |
| Extended Response | 6 Hz to 2.5 kHz, ±0.9 dB |
| Velocity Range | 50 in/s peak (1270 mm/s peak) |
| Amplitude Linearity | ±2% to 6 in/s peak |
| Transverse Sensitivity | <5% of axial sensitivity |
| Mounted Resonant Frequency | >12 kHz |
| Broadband Noise Floor | 0.004 mm/s RMS nominal |
| Output Bias Voltage | -12 Vdc ±3 V |
| Power Supply | -24 Vdc nominal |
| Typical Bias Current | 2 mA |
| Dynamic Output Impedance | <2400 Ω |
| Operating Temperature | -55°C to +121°C |
| Shock Survivability | Up to 5,000 g peak |
| Case Material | 316L stainless steel |
| Connector | 2-pin MIL-C-5015 |
| Housing | Hermetically sealed |
| Grounding | Case isolated |
| Agency Approval Option | -00, no hazardous-area approval |
| Approx. Diameter | 25.3 mm (0.995 in) |
| Approx. Height | 63.2 mm (2.49 in), sensor body |
| Approx. Weight | 142 g (5.0 oz), sensor body |
| Approx. Weight with Adapter | 180–200 g |
| Maximum Recommended Cable Length | Up to 305 m (1,000 ft), with suitable cable |
Applications
The 330500-06-00 is designed to measure absolute vibration velocity relative to free space. It is commonly used where vibration information from a machine casing, bearing housing, or structural surface is required.
Typical applications include:
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Steam turbine vibration monitoring
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Gas turbine casing monitoring
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Compressor vibration monitoring
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Pump bearing-housing monitoring
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Motor vibration measurement
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Generator vibration monitoring
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Fan and blower monitoring
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Gearbox casing vibration measurement
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Industrial rotating machinery protection
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General-purpose condition monitoring
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Bearing housing vibration measurement
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Structural vibration analysis
Because the sensor measures velocity directly, it is particularly useful for machinery-monitoring systems where vibration severity is evaluated in velocity units.
The broad frequency response also makes the Velomitor useful when both conventional machine vibration and higher-frequency vibration components need to be observed.
Advantages
Solid-State Piezoelectric Construction
The Velomitor uses a solid-state sensing design without moving mechanical components. This eliminates the mechanical wear associated with traditional moving-coil velocity sensors and provides a robust solution for continuous industrial operation.
Factory-Installed 5/8-18 UNF Mounting Adapter
The 5/8-18 UNF mounting configuration is the defining feature of the 330500-06-00. It provides a substantial mounting interface for machinery applications where a larger thread is preferred.
Wide Frequency Response
With a nominal 4.5 Hz to 5 kHz frequency response, the sensor can capture a broad range of machinery vibration phenomena. This makes it suitable for both general condition monitoring and more demanding rotating-equipment applications.
High Velocity Measurement Range
The sensor supports up to 50 in/s peak (1270 mm/s peak), providing substantial measurement headroom for machinery experiencing elevated vibration levels.
Flexible Installation Orientation
The solid-state design permits mounting in different orientations without the orientation-related limitations commonly associated with traditional mechanical velocity transducers.
Rugged Stainless-Steel Housing
The 316L stainless-steel case provides strong resistance to industrial environmental conditions. The hermetically sealed construction further protects the sensing electronics from moisture and contamination.
Low Base-Strain Sensitivity
The sensor's low base-strain sensitivity helps reduce measurement errors associated with deformation of the mounting structure, which can be valuable when the sensor is installed directly on machinery housings.
Case-Isolated Construction
The isolated case design helps reduce unwanted ground-loop effects and supports cleaner signal integration into machinery-monitoring systems.
Long Cable Capability
With an appropriate cable configuration, the Velomitor system can support cable runs of up to approximately 305 m (1,000 ft), giving maintenance and instrumentation teams considerable flexibility when locating monitoring equipment.
Industrial Temperature Capability
The operating range of -55°C to +121°C (-67°F to +250°F) allows the sensor to operate across a broad range of industrial environments.
Technical FAQs
1. What is the Bently Nevada 330500-06-00?
The 330500-06-00 is a Velomitor solid-state piezoelectric velocity sensor used for absolute vibration measurement on bearing housings, machine casings, and other structures.
2. What does the “-06” configuration mean?
The -06 identifies the 5/8-18 UNF mounting-thread option in the 330500 Velomitor family.
3. What does the final “-00” indicate?
The final -00 identifies the agency-approval configuration without a specified hazardous-area approval. Therefore, this particular model should be selected for applications where the required installation does not call for a certified hazardous-area version.
4. What is the sensor sensitivity?
The nominal sensitivity is 100 mV/in/s, equivalent to approximately 3.94 mV/mm/s, with a stated tolerance of ±5%.
5. What is the frequency response?
The nominal frequency response is 4.5 Hz to 5 kHz at ±3 dB. A tighter response specification of approximately 6 Hz to 2.5 kHz at ±0.9 dB is also specified.
6. What is the maximum velocity measurement range?
The nominal velocity range is 50 in/s peak, equivalent to approximately 1270 mm/s peak.
7. Can the 330500-06-00 be mounted in different orientations?
Yes. The solid-state piezoelectric design permits vertical, horizontal, or angled mounting without the orientation restrictions associated with traditional moving-coil velocity sensors.
8. What is the operating temperature range?
The specified operating temperature range is -55°C to +121°C (-67°F to +250°F).
9. What are the dimensions and weight?
The sensor body is approximately 25.3 mm in diameter and 63.2 mm high, with a basic weight of approximately 142 g. Including the mounting adapter, the assembled unit is approximately 180–200 g.
10. What should be checked before replacing a Velomitor sensor?
Confirm the 330500 series, 5/8-18 UNF mounting configuration, agency-approval requirements, sensitivity, frequency response, connector arrangement, cable type, mounting surface, and monitoring-system compatibility. A sensor with a different mounting adapter or certification configuration should not automatically be treated as a direct replacement.
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