Industrial-Grade Velocity Monitoring for Demanding Applications
The Bently Nevada 330500-07-04 Velomitor Piezo-Velocity Sensor is a precision-engineered vibration sensor designed to provide reliable absolute vibration velocity measurements for critical rotating machinery. As a member of the trusted 330500 Velomitor Series, it combines a solid-state piezoelectric sensing element with integrated electronics to deliver stable, long-term performance without the mechanical wear associated with traditional moving-coil velocity transducers.
The 330500-07-04 configuration features a 3/8-16 UNC mounting thread adapter and multiple hazardous-area approvals, making it suitable for industrial environments where both durability and regulatory compliance are required. Its compact 316L stainless-steel housing, hermetically sealed connector, and maintenance-free design make it an excellent choice for continuous online machinery condition monitoring.
Designed for seamless integration with Bently Nevada monitoring and protection systems, the 330500-07-04 helps maintenance professionals identify vibration-related issues such as imbalance, shaft misalignment, looseness, bearing degradation, and resonance before they lead to unexpected equipment failures.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330500-07-04 |
| Product Type | Velomitor Piezo-Velocity Sensor |
| Series | 330500 Velomitor Series |
| Sensor Technology | Integrating Piezoelectric Velocity Sensor |
| Output Type | Velocity |
| Sensitivity | 3.94 mV/mm/s (100 mV/in/s) ±5% |
| Velocity Measurement Range | Up to 1270 mm/s (50 in/s) Peak |
| Frequency Response | 4.5 Hz to 5 kHz (±3 dB) |
| Broadband Accuracy | 6 Hz to 2.5 kHz (±0.9 dB) |
| Resonant Frequency | Greater than 12 kHz |
| Output Bias Voltage | -12 ±3 VDC |
| Dynamic Output Impedance | Less than 2400 Ω |
| Connector | 2-Pin MIL-C-5015 Hermetically Sealed Connector |
| Housing Material | 316L Stainless Steel |
| Mounting Thread Adapter | 3/8-16 UNC |
| Hazardous Area Approval | Multiple Approvals (CSA, ATEX) |
| Maximum Cable Length | Up to 305 m (1000 ft) |
| Operating Temperature | -55°C to +121°C |
| Dimensions | 25.3 mm (Diameter) × 63.2 mm (Height) |
| Weight | Approximately 142 g (0.142 kg) |
Typical Industrial Applications
The 330500-07-04 is engineered for permanent vibration monitoring in facilities where machine reliability and operational continuity are essential.
Typical applications include:
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Steam turbines
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Gas turbines
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Electric motors
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Industrial compressors
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Centrifugal pumps
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Cooling tower fans
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Gearboxes
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Blowers
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Mining machinery
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Petrochemical processing equipment
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Power generation systems
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Paper and pulp production lines
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Water treatment facilities
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General rotating machinery with rolling-element bearings
Its integrated electronics provide dependable velocity measurements over extended operating periods, enabling early identification of common machinery faults while supporting predictive maintenance initiatives.
Key Advantages
The 330500-07-04 is designed to deliver dependable vibration monitoring performance under challenging industrial conditions.
Key benefits include:
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Solid-state piezoelectric technology with no moving mechanical components
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Direct velocity output for simplified vibration diagnostics
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Wide frequency response for comprehensive machinery analysis
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Rugged 316L stainless-steel construction for harsh environments
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Hermetically sealed industrial connector for enhanced reliability
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3/8-16 UNC mounting adapter for versatile installation
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CSA and ATEX hazardous-area certifications
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Supports long cable runs up to 305 meters
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Low maintenance requirements and extended service life
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Fully compatible with Bently Nevada machinery protection and condition monitoring systems
Technical FAQs
1. What is the primary function of the 330500-07-04?
It measures absolute casing vibration and provides a velocity output for continuous machinery condition monitoring.
2. What does the "-07-04" configuration represent?
The -07 option specifies a 3/8-16 UNC mounting thread adapter, while -04 identifies the version with multiple hazardous-area approvals, including CSA and ATEX.
3. What sensing technology is used?
The sensor utilizes a solid-state piezoelectric accelerometer with integrated electronic signal conditioning.
4. What is the sensitivity of the sensor?
The nominal sensitivity is 3.94 mV/mm/s (100 mV/in/s) with a tolerance of ±5%.
5. What frequency range does it support?
It provides a usable frequency response from 4.5 Hz to 5 kHz (±3 dB).
6. Which machines commonly use this sensor?
It is widely used on motors, pumps, compressors, turbines, fans, blowers, and gearboxes equipped with rolling-element bearings.
7. Is the sensor suitable for hazardous industrial environments?
Yes. The -04 configuration includes multiple hazardous-area certifications for approved installations.
8. What type of connector is fitted?
The unit features a rugged 2-pin MIL-C-5015 hermetically sealed connector designed for industrial service.
9. What are the physical dimensions and weight?
The sensor measures 25.3 mm in diameter × 63.2 mm in height and weighs approximately 142 g.
10. Why is the 330500-07-04 a reliable choice for predictive maintenance?
Its maintenance-free solid-state construction, stable velocity output, hazardous-area certifications, and proven long-term reliability help maintenance teams detect equipment issues early, reducing downtime and improving overall asset performance.
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