Bently Nevada 330703-000-050-10-01-00: 3300 XL 11 mm Proximity Probe
Overview
The Bently Nevada 330703-000-050-10-01-00 is a high-precision proximity probe in the 3300 XL 11 mm series, designed to non-contact measure shaft vibration, radial position, and axial displacement in rotating machinery. As a direct replacement for legacy 7200-series 11 mm and 14 mm transducer systems, this probe delivers reliable eddy-current measurement with an extended linear range, making it suitable for critical turbomachinery applications in power generation, oil and gas, and heavy industry.
Key Features and Benefits
Extended Linear Range: The 11 mm probe tip provides a larger linear measurement range compared to standard 8 mm probes, accommodating greater shaft excursions caused by thermal growth and dynamic loads in large rotating equipment.
Non-Contact Eddy Current Technology: Measures shaft position and dynamic motion without physical contact, eliminating wear and enabling continuous monitoring of fluid-film bearing machines.
Robust Environmental Performance: Operates reliably across a wide temperature range of -52°C to +177°C, with a polyphenylene sulfide (PPS) probe tip and AISI 304 stainless steel housing for resistance to chemicals, lubricants, and harsh industrial conditions.
Secure ClickLoc Connection: Features gold-plated ClickLoc coaxial connectors that lock into position, preventing loosening in high-vibration environments and ensuring stable signal transmission.
System Compatibility: Fully interchangeable with 3300 XL extension cables and Proximitor sensors. Compatible with 3500 monitoring systems (requires appropriate configuration for 11 mm transducer type).
Technical Specifications
Parameter Value
Model 330703-000-050-10-01-00
Series 3300 XL 11 mm Proximity Probe
Probe Tip Diameter 11 mm
Thread Type M14 × 1.5
Overall Case Length 50 mm
Total Length 1.0 metre (3.3 ft)
Connector Type: Miniature coaxial ClickLoc
Linear Range 4.0 mm (160 mils), from approximately 0.5 mm to 4.5 mm
Nominal Sensitivity 3.94 V/mm (100 mV/mil)
Frequency Response: 0 to 8 kHz
Operating Temperature -52°C to +177°C (-62°F to +351°F)
Probe Tip Material: Polyphenylene sulfide (PPS)
Probe Case Material: AISI 304 stainless steel
Cable Type: 75 Ω triaxial, FEP insulated
Weight: Approximately 0.070 kg (2.5 oz)
Specifications sourced from.
Part Number Configuration
The complete part number 330703-000-050-10-01-00 decodes as follows:
330703: 3300 XL 11 mm Probe, M14 × 1.5 thread, without armor
000: Unthreaded length — 0 mm
050: Overall case length — 50 mm
10: Total length — 1.0 metre (3.3 ft)
01: Connector and cable type — Miniature coaxial ClickLoc connector, standard cable
00: Agency approval — Not required
Applications
The 330703-000-050-10-01-00 is designed for a wide range of machinery protection and condition monitoring applications:
Radial Vibration Measurement: Monitor shaft vibration relative to bearing housings in turbines, compressors, and motors.
Axial Displacement: Measure thrust position and axial movement of rotating shafts.
Steam Turbine Differential Expansion: Detect ramp differential expansion in steam turbines.
Reciprocating Compressor Rod Position: Monitor piston rod displacement and drop.
Keyphasor and Speed Reference: Provide phase reference signals for speed and rotor dynamics analysis.
Installation Guidelines
Proper installation is critical for accurate measurement and long-term reliability:
Thread Engagement: Maximum thread engagement is 21 mm. Verify M14 × 1.5 thread integrity before insertion.
Gap Setting: Set the probe gap to produce a nominal -10 VDC output at the Proximitor sensor for the center of the linear range (approximately 2.5 mm gap).
Torque Specifications: Recommended torque for the probe case is 21.1 N·m (187 in·lb); maximum rated torque is 63.3 N·m (560 in·lb).
Cable Routing: Route cables through grounded metal conduit, segregated from high-voltage power wiring to prevent electromagnetic interference.
Connector Handling: Ensure the ClickLoc connector engages fully with an audible click. Do not disconnect while the circuit is energized unless the area is confirmed non-hazardous.
Frequently Asked Questions
Can this probe replace older 7200-series probes?
Yes. The 330703-000-050-10-01-00 is designed as a direct replacement for 7200-series 11 mm and 14 mm probes. However, all system components (extension cables and Proximitor sensor) must also be upgraded to 3300 XL 11 mm components, and the monitoring system configuration must be updated.
What is the difference between the 11 mm probe and standard 8 mm probes?
The 11 mm probe offers a larger linear measurement range (4.0 mm vs. 2.0 mm for 8 mm probes), making it better suited for machinery with larger shaft excursions. The 8 mm probe remains appropriate for applications with smaller displacement ranges.
Does this probe require a specific Proximitor sensor?
Yes. The 330703 probe must be paired with a 3300 XL 11 mm Proximitor sensor. Using an 8 mm Proximitor will result in incorrect scaling and unreliable measurements. The total system length (probe cable plus extension cable) must match the Proximitor calibration.
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