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Product Introduction
The Bently Nevada 330879-03-03 3300 XL 50 mm Proximitor Sensor is a high-precision, non-contact displacement transducer specifically engineered for monitoring large rotating machinery. Part of the Bently Nevada 3300 XL Series, this sensor is designed to provide accurate measurements of shaft vibration, position, and axial displacement in critical industrial equipment such as turbines, compressors, generators, and large motors.
This model offers an extended 50 mm linear range, making it ideal for applications where large shaft excursions occur, including slow-speed rotors and large-diameter shafts. It operates using eddy current sensing technology, which converts the distance between the probe tip and the conductive target surface into a proportional voltage signal. When integrated with the corresponding 3300 XL proximity system, including extension cables and sensors, it delivers precise output compatible with Bently Nevada’s 3500 Monitoring System.
The 330879 series is designed to comply with API 670 standards, ensuring high measurement fidelity, repeatability, and system compatibility. The sensor features a rugged stainless steel body with a hermetically sealed design, providing resistance to moisture, oil, and harsh industrial environments. Its reliability and accuracy make it a trusted solution for continuous machinery condition monitoring and protection.
Product Specifications
| Parameter | Description |
|---|---|
| Model Number | 330879-03-03 |
| Series | Bently Nevada 3300 XL 50 mm Proximitor Sensor |
| Manufacturer | Bently Nevada (GE Measurement & Control) |
| Measurement Principle | Eddy current, non-contact displacement measurement |
| System Compatibility | 3300 XL Proximity Transducer System |
| Linear Range | 50 mm (2000 mils) |
| System Sensitivity | 7.87 V/mm (200 mV/mil) |
| Frequency Response | DC to 5 kHz |
| Nominal Gap (Target Distance) | 5 mm (200 mils) |
| Linearity | ±1% of full-scale output |
| Target Material | AISI 4140 steel or equivalent conductive material |
| Probe Tip Diameter | 50 mm |
| Thread Size | M50 × 1.5 or 2-inch UNC (depending on variant) |
| Cable Length | 4 m standard, optional longer lengths available |
| Extension Cable Model | 330855 / 330856 series |
| Operating Temperature (Probe) | -35°C to +180°C |
| Operating Temperature (Cable) | -35°C to +150°C |
| Storage Temperature | -50°C to +200°C |
| Environmental Protection | Hermetically sealed, corrosion and oil resistant |
| Electrical Connector Type | Coaxial connector with keyway |
| Material | Stainless steel housing, PEEK sensing tip |
| Power Requirements | Supplied through the proximity sensor (no external source required) |
| Insulation Resistance | >10 MΩ at 500 VDC |
| Shock Resistance | 500 g peak, 11 ms half-sine |
| Vibration Tolerance | 50 g, 10–2000 Hz |
| Mounting Type | Threaded mount or probe holder assembly |
| Protection Rating | IP68 (probe and cable assembly) |
| Compliance Standards | API 670, CE, RoHS |
| Diameter | 50 mm |
| Shipping Weight | 3 kg |
Product Applications
The Bently Nevada 330879-03-03 50 mm Proximitor Sensor is designed for high-precision monitoring of large and critical rotating machinery. Its extended measurement range makes it suitable for applications with large shaft displacement or slow-speed rotors.
Key applications include:
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Steam and Gas Turbines: Monitoring axial position, shaft vibration, and thermal growth.
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Compressors and Expanders: Measuring rotor movement and detecting misalignment or eccentricity.
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Hydrogenerators and Large Motors: Ensuring rotor alignment, detecting imbalance, and monitoring vibration patterns.
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Centrifugal Pumps and Fans: Tracking bearing and shaft movement in high-capacity systems.
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Refineries and Petrochemical Plants: Providing continuous condition monitoring for critical rotating equipment.
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Power Generation Plants: Protecting high-value assets by delivering precise vibration and displacement measurements.
The sensor’s 50 mm linear range allows engineers to monitor large excursions in heavy machinery that standard probes cannot accommodate.
Product Advantages
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Extended Measurement Range: 50 mm linear range suitable for large shafts and slow-speed rotors.
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High Accuracy and Linearity: ±1% accuracy across the entire range ensures precise monitoring.
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Rugged Industrial Construction: Stainless steel housing and hermetic sealing for resistance against oil, moisture, and harsh environments.
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Temperature-Resistant Design: Can operate reliably at probe temperatures up to +180°C.
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API 670 Compliance: Meets international standards for rotating machinery protection.
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Excellent EMI/RFI Immunity: Maintains measurement integrity in electrically noisy environments.
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Non-Contact Sensing: Prevents wear and reduces maintenance requirements.
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Interchangeable Components: Compatible with other 3300 XL sensors, extension cables, and proximity systems.
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Flexible Installation: Threaded or bracket mounting for easy integration into various machinery housings.
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Proven Reliability: Widely used in industry for continuous machinery monitoring and protection.
FAQ
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What principle does the 330879 sensor use for measurement?
It uses eddy current technology to measure displacement between the probe tip and a conductive target. -
What is the standard system output sensitivity?
The probe system provides 7.87 V/mm (200 mV/mil). -
Can this sensor operate in high-temperature conditions?
Yes, the probe can operate up to +180°C. -
Is the 330879 compatible with Bently Nevada 3500 monitoring systems?
Yes, it integrates seamlessly with the 3500 and 3300 XL series monitoring systems. -
What target material is recommended for accurate readings?
AISI 4140 steel or equivalent conductive materials are recommended. -
Does the sensor require an external power source?
No, it is powered through the associated proximity sensor. -
What is the vibration and shock tolerance of this sensor?
It can withstand up to 50 g vibration (10–2000 Hz) and 500 g shock (11 ms half-sine). -
Can it be used for slow-speed, large-diameter rotors?
Yes, its 50 mm range is designed for large or slow-moving shafts. -
How is the probe protected against environmental factors?
The sensor is hermetically sealed with an IP68 rating, providing resistance to dust, oil, and moisture. -
Do the probe and cable need factory matching?
Yes, factory-matched cables and sensors ensure calibration and accurate measurement.
Related Models (Same Series or Equivalent)
| Model | Description | Linear Range | Sensitivity | Temperature Range |
|---|---|---|---|---|
| 330879-02-02 | 50 mm Proximitor Sensor, Short Version | 50 mm | 7.87 V/mm | -35°C to +180°C |
| 330851-05-000-040-10-00 | 25 mm XL Proximity Probe | 25 mm | 7.87 V/mm | -35°C to +180°C |
| 330852-00-012-10-02-00 | Extended 50 mm Probe | 50 mm | 7.87 V/mm | -35°C to +180°C |
| 330855-02-12-00-00 | Extension Cable, Standard | — | — | -35°C to +150°C |
| 330856-04-12-00-00 | Heavy-Duty Extension Cable | — | — | -35°C to +150°C |
| 330180-90-00 | Proximity Sensor (Driver Module) | — | 200 mV/mil | -35°C to +180°C |
Popular Bently Nevada Models (Same Brand)
| Model | Description | Product Type | Key Feature |
|---|---|---|---|
| 330103-00-07-10-02-05 | 8 mm Proximity Probe | Displacement Sensor | General purpose probe for rotating machinery |
| 3500/42M | Vibration Monitor | Monitoring Module | Dual-axis vibration measurement |
| 3500/22M | Transient Data Interface | Communication Module | High-speed waveform capture |
| 3500/25 | Keyphasor Module | Phase Reference | Provides rotational phase reference |
| 330130-040-00-00 | Extension Cable | Coaxial Cable | 4 m standard matched cable |
| 330180-91-05 | Proximity Sensor | Driver Module | Converts probe signals to conditioned output |
