Introduction
The Bently Nevada 330703-000-050-10-12-CN 3300 XL 11 mm Proximity Probe is a metric, standard-mount eddy-current proximity probe designed for accurate non-contact measurement of shaft vibration and position on critical rotating machinery.
This configuration uses an M14 × 1.5 thread, a 50 mm overall case length, and a 1.0 m integral cable. The 12 cable option specifies a miniature coaxial ClickLoc connector with FluidLoc cable, while the CN approval option is configured for ATEX/IECEx and Chinese NEPSI hazardous-area requirements.
As part of the 3300 XL 11 mm system, the probe's larger sensing tip provides a longer linear measurement range than the standard 3300 XL 8 mm system. This makes the 11 mm platform particularly useful for axial position, thrust position, differential expansion, rod position, Keyphasor, and other demanding machinery measurements.
Technical Specifications
The 330703-000-050-10-12-CN should be evaluated as one component of a complete 3300 XL 11 mm Proximity Transducer System. Proper system performance depends on matching the probe with the appropriate extension cable and Proximitor Sensor.
| Specification | 330703-000-050-10-12-CN |
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| Manufacturer | Bently Nevada |
| Product Family | 3300 XL 11 mm |
| Product Type | 11 mm Proximity Probe |
| Model | 330703 |
| Mounting Style | Standard Mount |
| Thread | M14 × 1.5 |
| Armor | Without armor |
| Unthreaded Length | 0 mm |
| Overall Case Length | 50 mm |
| Integral Cable Length | 1.0 m (3.3 ft) |
| Connector/Cable Option | 12 |
| Connector | Miniature coaxial ClickLoc |
| Cable Type | FluidLoc |
| Agency Approval | CN |
| Approval Configuration | ATEX/IECEx and Chinese NEPSI |
| Measurement Principle | Eddy-current proximity sensing |
| Typical Sensitivity | 100 mV/mil (3.94 V/mm) |
| System Frequency Response | 0 to 8 kHz, +0/-3 dB typical |
| Recommended Gap | 2.5 mm (100 mil) |
| Minimum Target Diameter | 30.5 mm (1.2 in), flat target |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Probe Case Material | AISI 304 stainless steel |
| Probe Cable | 75 Ω triaxial, FEP insulated |
| Approx. Probe Weight | 70 g minimum-length, non-armored reference |
| Listed Shipping Weight | Approx. 2 kg |
Applications
The 330703-000-050-10-12-CN is designed for critical machinery where accurate non-contact displacement measurement is required.
Typical applications include:
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Steam turbine axial position monitoring
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Thrust position measurement
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Radial shaft vibration monitoring
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Differential expansion measurement
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Reciprocating compressor rod position
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Rod-drop measurement
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Keyphasor and phase-reference applications
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Tachometer measurements
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Zero-speed detection
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Bearing vibration monitoring
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Critical rotating-equipment protection
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Machinery condition monitoring
The 3300 XL 11 mm system is especially valuable when the longer linear range of the 11 mm sensing platform is preferred over the standard 8 mm system. The system is specified for position and vibration measurements across a frequency range of 0 to 8 kHz.
For large rotating machinery, correct probe placement and target geometry are essential. The system documentation recommends a minimum flat target diameter of approximately 30.5 mm (1.2 in) and identifies 152 mm (6 in) as the recommended minimum shaft diameter for typical shaft measurements.
Advantages
Larger 11 mm Sensing Platform
The 3300 XL 11 mm system uses a larger probe tip than the 8 mm platform, providing a longer linear range that is particularly useful for axial-position and other displacement measurements.
Precise Metric Mounting
The M14 × 1.5 thread provides a practical metric mounting interface for machinery installations designed around metric mechanical hardware.
Compact 50 mm Case
The 50 mm overall case length offers a relatively compact standard-mount configuration while maintaining the mechanical robustness expected from an industrial proximity probe.
FluidLoc Cable
The 12 configuration incorporates FluidLoc cable, providing an additional layer of protection for installations where exposure to turbine oil or similar fluids is a concern.
ClickLoc Connector
The miniature coaxial ClickLoc connector is designed to lock into position, helping prevent the connection from loosening during machinery operation. The 3300 XL design also uses a robust probe-to-cable attachment arrangement.
Stainless-Steel Probe Case
The AISI 304 stainless-steel case provides a durable mechanical enclosure suitable for permanent industrial installation.
High-Temperature Capability
The 3300 XL 11 mm probe family has a specified probe temperature range of approximately -52°C to +177°C (-62°F to +351°F), giving the probe considerable environmental flexibility for industrial machinery applications.
Strong Cable-to-Probe Construction
The 3300 XL probe design incorporates CableLoc technology with a rated probe case-to-lead pull strength of approximately 330 N (75 lb), helping improve mechanical reliability during installation and maintenance.
Hazardous-Area Configuration
The CN suffix identifies the agency-approval configuration associated with ATEX/IECEx and Chinese NEPSI hazardous-area marking for this specific model. This makes the configuration particularly relevant to machinery installed in appropriately classified hazardous areas.
Technical FAQs
1. What is the Bently Nevada 330703-000-050-10-12-CN?
It is a 3300 XL 11 mm standard-mount proximity probe with an M14 × 1.5 thread, 50 mm case length, 1 m integral cable, FluidLoc cable, and CN approval configuration.
2. What does 330703 identify?
330703 identifies the metric 3300 XL 11 mm probe with an M14 × 1.5 thread and no armor.
3. What does the “000” portion of the part number mean?
The 000 option specifies a 0 mm unthreaded length for this configuration.
4. What does “050” mean?
The 050 option specifies a 50 mm overall case length.
5. How long is the integral cable?
The 10 option specifies a 1.0 m (3.3 ft) total probe cable length.
6. What does “12” mean in the model number?
The 12 cable/connector option specifies a miniature coaxial ClickLoc connector with FluidLoc cable.
7. What does the “CN” suffix indicate?
The CN configuration is associated with ATEX/IECEx and Chinese NEPSI hazardous-area marking.
8. What is the recommended probe gap?
The standard 3300 XL 11 mm system is typically specified with a 2.5 mm (100 mil) recommended gap under the stated calibration conditions.
9. What is the frequency response?
The 3300 XL 11 mm transducer system has a typical frequency response of 0 to 8 kHz, +0/-3 dB.
10. Can this probe replace a 3300 XL 8 mm probe directly?
Not automatically. The 11 mm and 8 mm systems have different probe sizes and system characteristics. The probe, extension cable, and Proximitor Sensor must be correctly matched as a complete transducer system. When upgrading from another transducer family, the monitoring-system compatibility must also be checked.
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