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Product Introduction
The Bently Nevada 330708-00-10-90-02-00 3300 XL 11 mm Proximity Probe is a precision-engineered non-contact vibration and displacement sensor designed for high-reliability machinery monitoring applications. As part of the Bently Nevada 3300 XL Series, this probe delivers exceptional accuracy, thermal stability, and electromagnetic immunity, making it ideal for use in industrial and power generation equipment.
This model is designed to measure the relative motion between a conductive shaft and the probe tip using the eddy current principle. It generates an electrical signal proportional to the displacement, enabling accurate vibration and shaft position monitoring. The 330708-00-10-90-02-00 features a robust stainless steel body, double-shielded coaxial cable, and hermetically sealed construction, ensuring long-term reliability even under severe mechanical, thermal, and chemical conditions.
Its extended cable length and optimized design provide flexibility for installation in large machinery setups, including turbines, compressors, pumps, and motors. This probe maintains full compatibility with 3300 XL Proximitor Sensors and extension cables, forming part of a complete measurement chain that complies with API 670 vibration protection standards.
Technical Specifications
| Parameter | Description |
|---|---|
| Model | Bently Nevada 330708-00-10-90-02-00 |
| Series | 3300 XL 11 mm Proximity Probe |
| Measurement Principle | Eddy Current (non-contact displacement) |
| Nominal Sensitivity | 200 mV/mil (7.87 mV/μm) |
| Linear Range | 2.0 mm (80 mils) |
| Usable Measurement Range | 0.25 mm to 2.25 mm |
| Frequency Response | DC to 10 kHz (±3 dB) |
| Standard Target Material | AISI 4140 steel |
| Operating Temperature (Probe) | -35°C to +177°C |
| Storage Temperature | -55°C to +200°C |
| Temperature Coefficient | < 0.1% per °C |
| Probe Tip Diameter | 11 mm |
| Mounting Thread | M14 × 1.5 |
| Mounting Type | Front mount |
| Probe Body Material | Stainless steel, corrosion resistant |
| Cable Type | Double-shielded coaxial cable |
| Electrical Isolation | Tip isolated from probe body |
| Compliance Standards | API 670, CE, CSA, ATEX (system dependent) |
| Weight | 1.29 kg |
| Total Length | 9.0 meters |
Product Applications
The Bently Nevada 330708-00-10-90-02-00 Proximity Probe is engineered for use in rotating and reciprocating machinery requiring precise, continuous monitoring of vibration and shaft position. Its non-contact sensing design provides real-time, high-resolution measurements essential for predictive maintenance and machinery protection systems.
Key application areas include:
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Gas Turbines: Detecting radial and axial shaft movement to prevent rotor-stator rubs and imbalance.
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Steam Turbines: Monitoring vibration and axial displacement in high-temperature, high-speed environments.
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Compressors: Measuring shaft vibration to detect misalignment or early-stage bearing failure.
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Pumps and Fans: Detecting mechanical looseness, imbalance, and misalignment in continuous process systems.
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Electric Motors and Generators: Tracking shaft movement to identify rotor instability or mechanical wear.
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Gearboxes: Providing accurate position feedback to detect abnormal gear engagement or bearing wear.
By integrating with Bently Nevada’s 3300 XL Proximitor Sensors, the 330708 probe forms part of a fully compliant API 670 vibration protection system, enabling accurate diagnostics and improved operational reliability.
Product Advantages
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Exceptional Measurement Accuracy: Maintains a consistent 200 mV/mil sensitivity over its full linear range.
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Enhanced Thermal Stability: Operates reliably under high temperature variations, minimizing drift.
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Durable and Corrosion-Resistant Design: Stainless steel construction ensures long service life in harsh conditions.
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High EMI/RFI Immunity: Double-shielded coaxial cable ensures stable signal transmission even in noisy electrical environments.
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Wide Frequency Response: Capable of capturing both low and high-frequency vibration signals for comprehensive monitoring.
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API 670 Compliance: Meets the highest standards for machinery protection and condition monitoring.
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Long Cable Configuration: The 9-meter cable design supports flexible installation across large industrial systems.
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Maintenance-Free Operation: Non-contact sensing eliminates wear and reduces recalibration requirements.
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Excellent Linearity: Ensures precise measurements over the entire operational gap.
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Seamless System Integration: Fully compatible with 3300 XL Proximitor Sensors and extension cables.
FAQ
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What sensing principle does the 330708-00-10-90-02-00 probe use?
It operates on the eddy current displacement measurement principle, which detects the gap between the probe tip and the conductive target surface. -
Which Proximitor Sensor is compatible with this probe?
The probe is specifically designed for use with the Bently Nevada 3300 XL Proximitor Sensor, ensuring matched calibration and accuracy. -
Can this probe measure both dynamic and static signals?
Yes, it measures both dynamic vibration (shaft motion) and static displacement (shaft position). -
How does cable shielding affect measurement performance?
The double-shielded coaxial cable minimizes electromagnetic interference, ensuring stable signal output even in electrically noisy industrial settings. -
What is the typical voltage output range for this probe?
The standard system output is 200 mV per mil of shaft movement, corresponding linearly to the displacement gap. -
What environmental conditions can this probe withstand?
The 330708 can operate continuously between -35°C and +177°C, making it suitable for both standard and high-temperature applications. -
Is this probe suitable for hazardous area installations?
Yes, when used as part of a certified 3300 XL system, it can comply with ATEX, CSA, and CE hazardous location standards. -
How critical is the probe-target gap during installation?
Proper gap setting is essential to ensure accurate measurement and to maintain the linear operating range of the sensor. -
Can this probe be used for high-speed turbine monitoring?
Absolutely. Its wide DC to 10 kHz frequency response supports accurate monitoring of both slow and fast rotating equipment. -
What materials are recommended for the target surface?
The probe is factory-calibrated for AISI 4140 steel, ensuring optimal response. Other conductive metals may be used but may require recalibration for exact accuracy.
Related Models (Same Series)
| Model | Description |
|---|---|
| 330708-00-10-90-02-05 | 11 mm probe variant with alternative connector configuration |
| 330706-05-46-10-02-00 | Reverse mount probe for rear-entry installations |
| 330704-005-040-10-02-00 | Standard front-mount probe for general applications |
| 330704-000-040-10-02-05 | High-temperature 11 mm probe with robust mounting thread |
| 330703-000-100-10-02-00 | Compact 11 mm probe for confined space applications |
| 330703-010-070-10-01-00 | Medium-range 11 mm probe designed for balanced rotor systems |
Popular Bently Nevada Models
| Model | Description |
|---|---|
| 3500/42M | Proximitor/Seismic Monitor module for multi-channel vibration measurement |
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| 330130-040-00 | 8 mm proximity probe for standard industrial machinery |
| 330780-51-00 | 3300 XL Proximitor Sensor compatible with 11 mm probes |
| 330103-00-12-10-02-00 | 8 mm proximity probe with broad frequency response |
