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Product Introduction
The Bently Nevada 330851-04-002-010-00-05 3300 XL 25 mm Proximity Probe is a precision-engineered, non-contact displacement transducer designed for the monitoring and protection of large and critical rotating machinery. As part of the 3300 XL series, it provides accurate, linear, and stable measurements of shaft vibration, radial position, and axial displacement.
This model is specifically optimized for large shaft applications, offering a 25 mm linear range that exceeds the capability of standard probes such as the 8 mm and 11 mm versions. It is used extensively in heavy-duty turbines, generators, compressors, and large motors where shaft size and displacement amplitude are significant.
The 330851 series utilizes eddy current sensing technology to convert the distance between the probe tip and the target surface into a proportional voltage output. When paired with the matching 3300 XL extension cable and proximity sensor, it forms a complete transducer system that delivers a standard output of 7.87 V/mm (200 mV/mil), fully compliant with API 670 requirements for machine condition monitoring and protection.
The probe’s construction features high-quality stainless steel housing and hermetically sealed design, ensuring excellent resistance to moisture, oil, and corrosive industrial environments. Its durability and measurement accuracy make it a trusted choice for long-term monitoring in critical machinery protection systems.
Product Specifications
| Parameter | Description |
|---|---|
| Model Number | 330851-04-002-010-00-05 |
| Product Series | Bently Nevada 3300 XL 25 mm Proximity Probe |
| Manufacturer | Bently Nevada (GE Measurement & Control) |
| Measurement Principle | Eddy current, non-contact displacement measurement |
| System Compatibility | Works with 3300 XL Proximity Transducer System |
| Linear Range | 25 mm (1000 mils) |
| System Sensitivity | 7.87 V/mm (200 mV/mil) |
| Frequency Response | DC to 5 kHz |
| Typical Linearity | ±1% of full-scale output |
| Nominal Gap (Target Distance) | 2.5 mm (100 mils) |
| Target Material | AISI 4140 steel or equivalent conductive surface |
| Probe Tip Diameter | 25 mm |
| Thread Size | M30 × 1.5 or 1-1/8-12 UNF (depending on variant) |
| Extension Cable Model | 330855 or 330856 series (factory-matched) |
| 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-resistant, oil-tight |
| Electrical Connector Type | Coaxial connector with keyway, MIL-type design |
| Material | Stainless steel body, PEEK tip |
| Insulation Resistance | >10 MΩ at 500 VDC |
| Shock Resistance | 500 g, 11 ms half-sine |
| Vibration Tolerance | 50 g, 10–2000 Hz |
| Power Supply | Provided through proximity sensor (no external supply) |
| Mounting Configuration | Threaded mount or probe holder assembly |
| Compliance Standard | API 670, CE, RoHS |
| Protection Rating | IP68 (probe and cable assembly) |
| Dimensions | Probe length: varies by configuration (typically 110 mm) |
| Total Length | Optional |
| Weight | 0.23 kg |
Product Applications
The Bently Nevada 330851 25 mm Proximity Probe is primarily used for large machinery and slow-speed rotating equipment where extended linear range and high measurement accuracy are essential. Its applications include:
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Steam and Gas Turbines: Monitoring shaft vibration, position, and differential expansion.
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Large Compressors: Measuring shaft movement and bearing vibration under load variations.
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Hydrogenerators and Large Motors: Ensuring shaft centering, detecting eccentricity, and monitoring thermal growth.
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Pumps and Fans: Observing bearing housing displacement and rotor dynamics.
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Nuclear and Fossil Power Plants: Providing continuous protection feedback for high-value machinery.
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Industrial Process Equipment: Used in refinery, petrochemical, and offshore installations where reliability is critical.
The probe’s extended range allows engineers to monitor slow or large-diameter rotors that exhibit greater displacement, where standard short-range probes may not be sufficient.
Product Advantages
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Wide Measurement Range: Provides up to 25 mm of linear displacement measurement, ideal for large shaft applications.
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Superior Linearity and Accuracy: Offers consistent signal output over a broad operating range.
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Robust Construction: Stainless steel body and hermetically sealed design resist corrosion, oil, and contaminants.
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High Temperature Capability: Operates reliably in environments up to +180°C.
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Interchangeable Components: Fully compatible with other 3300 XL series probes, cables, and sensors.
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Excellent EMI/RFI Immunity: Designed to function accurately even in electrically noisy environments.
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Non-Contact Measurement: Eliminates wear and mechanical interference with the rotating surface.
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Complies with API 670 Standard: Ensures measurement quality and system interoperability.
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Easy Installation: Flexible length and threading options simplify mounting in restricted or custom-designed housings.
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Reliable Long-Term Performance: Engineered for 24/7 operation in harsh industrial conditions.
FAQ
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What measurement technology does the 330851 probe use?
It operates on the eddy current principle to measure the distance between the probe tip and a conductive target. -
What is the standard output sensitivity of this probe system?
The system provides a standard sensitivity of 7.87 V/mm (200 mV/mil). -
Which target materials are recommended for accurate operation?
The probe is calibrated for AISI 4140 steel and materials with similar conductivity. -
Can this probe be used with other cable lengths?
Yes, but the probe and extension cable must be factory-matched for proper calibration. -
What is the maximum operating temperature of the probe?
The probe can operate in temperatures up to +180°C. -
How does this probe handle electrical noise in industrial environments?
It is designed with high EMI/RFI immunity, ensuring accurate readings even under electrical interference. -
Is this probe suitable for slow-speed machinery?
Yes, the 25 mm range makes it ideal for large, slow-rotating shafts such as those in hydrogenerators. -
What is the linear range of the 330851 probe?
The probe has a linear range of 25 mm, significantly larger than standard probes. -
Does it require an external power source?
No, it is powered by the proximity sensor it connects to. -
Is this probe compatible with Bently Nevada 3500 monitoring systems?
Yes, it integrates seamlessly with the 3500 and 3300 XL monitoring platforms.
Related Models (Same Series or Equivalent)
| Model | Description | Range | Sensitivity | Temperature Range |
|---|---|---|---|---|
| 330850-50-05 | 8 mm Proximity Probe | 2 mm | 7.87 V/mm | -35°C to +180°C |
| 330851-02-000-10-02-05 | 25 mm Probe, Short Version | 25 mm | 7.87 V/mm | -35°C to +180°C |
| 330852-00-012-10-02-00 | 50 mm Extended Range Probe | 50 mm | 7.87 V/mm | -35°C to +180°C |
| 330855-02-12-00-00 | Extension Cable for 25 mm Probe | — | — | -35°C to +150°C |
| 330856-04-12-00-00 | Heavy-Duty Cable Assembly | — | — | -35°C to +150°C |
| 330180-90-00 | Proximity Sensor for 3300 XL System | — | 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 | 200 mV/mil sensitivity, rugged design |
| 3500/42M | Vibration Monitor | Monitoring Module | Dual-channel measurement for X/Y vibration |
| 3500/22M | Transient Data Interface | Communication Module | High-speed waveform data capture |
| 3500/25 | Keyphasor Module | Phase Reference Module | Provides phase reference for shaft analysis |
| 330130-040-00-00 | Extension Cable | Transducer Component | 4 m coaxial matched cable |
| 330180-91-05 | Proximity Sensor | Signal Conditioning Module | Amplifies and conditions proximity signals |
