The Bently Nevada 330104-00-05-50-02-05 represents the gold standard in non-contact displacement sensing for high-speed industrial machinery. This 3300 XL 8mm proximity probe tracks the microscopic movements of rotating shafts in steam turbines, centrifugal compressors, and large-scale motors with absolute precision. By utilizing advanced eddy current technology, the sensor captures both radial vibration and axial position data without physical contact, ensuring zero mechanical wear and long-term signal stability.
Operating as a critical link in Turbine Supervisory Instrumentation (TSI), this probe identifies early mechanical instabilities such as shaft imbalance, misalignment, or bearing degradation. Its ability to deliver high-fidelity voltage signals proportional to the gap between the probe tip and target surface allows maintenance teams to implement sophisticated predictive maintenance. This prevents catastrophic equipment failure and optimizes the operational lifespan of high-value industrial assets in the oil, gas, and power generation sectors.
The model 330104-00-05-50-02-05 features a modular design where each segment of the part number specifies a critical mechanical or electrical attribute:
The 00 indicates a 0.0-inch unthreaded length. This configuration provides a fully threaded body (3/8-24 UNF), allowing for maximum engagement and stability when mounting the probe through thick machine casings or specialized brackets.
This designates a 0.5-inch overall case length. The compact housing facilitates installation in tight internal clearances where space between the mounting port and the target shaft is severely restricted.
The 50 specifies a 5.0-meter (approx. 16.4 feet) total system length. The probe, extension cable, and Proximitor sensor must all share this 5.0m calibration to maintain the precise 200 mV/mil scale factor required for API 670 compliance.
The 02 option includes a miniature coaxial ClickLoc connector with a connector protector to prevent fluid contamination. The 05 confirms Multiple Agency Approvals (including ATEX, IECEx, and CSA), authorizing safe operation in Class I, Division 1 and 2 hazardous areas.
| Feature | Specification Details |
| Probe Tip Diameter | 8.0 mm (0.315 in) |
| Linear Range | 2.0 mm (80 mils) |
| Nominal Sensitivity (ISF) | 7.87 V/mm (200 mV/mil) |
| Target Material | AISI 4140 Steel (Standard Calibration) |
| Operating Temperature | -51 °C to +177 °C (-60 °F to +351 °F) |
| Pressure Rating | Sealing up to 70 psi (4.8 bar) |
| System Length | 5.0 Meters |
| Agency Approvals | ATEX, IECEx, CSA, TR CU |
Achieving laboratory-grade accuracy in a field environment requires strict adherence to Bently Nevada's engineering protocols:
Installers must set the initial "Static Gap" using a Digital Multimeter (DMM). For a 3300 XL 8mm system, the midpoint of the linear range corresponds to -10.0 VDC. Adjust the probe depth until the Proximitor output reaches this value, ensuring the shaft is at its rest position before locking the sensor in place.
Coaxial leads are sensitive to physical deformation. Maintain a minimum bend radius of 25.4 mm (1.0 inch). Use flexible conduit to protect the cable from mechanical damage and avoid running probe leads parallel to high-voltage AC lines to prevent electromagnetic interference.
Always use the provided connector protectors. Moisture or oil ingress into the coaxial connection is the primary cause of "signal drift" or intermittent faults. Ensure the ClickLoc connectors are properly seated before sliding the protector sleeve over the junction.
High-Performance PPS Tip: The probe tip utilizes Polyphenylene Sulfide (PPS), a high-performance thermoplastic that resists chemical corrosion and maintains structural integrity at extreme temperatures.
TSI Seamless Integration: This probe communicates natively with Bently Nevada 3500 series monitors, ensuring immediate data visualization in System 1 software without complex recalibration.
Gold-Plated ClickLoc Connectors: Gold-plated contacts ensure low-resistance signal transmission and prevent oxidation in humid coastal or offshore environments.
API 670 Compliance: The 3300 XL series meets or exceeds the American Petroleum Institute (API) 670 standards for machinery protection systems, ensuring global interoperability and safety.
Q1: How do I verify if the 330104 probe is damaged?
A1: Measure the DC resistance between the center pin and the outer shield of the ClickLoc connector. A healthy 5.0m probe lead typically reads between 7.0 Ω and 11.0 Ω. An infinite reading indicates an open circuit, requiring probe replacement.
Q2: Can I use this 5.0m probe with a 9.0m Proximitor sensor?
A2: No. The total electrical length must match the Proximitor's calibration. A 5.0m probe must be paired with a 5.0m system Proximitor. Mismatching lengths will cause significant linearity errors and inaccurate vibration data.
Q3: Does this probe require an Ethernet router for communication?
A3: No. This is a common error in logistics data. The 330104 is a passive analog sensor. It provides a raw signal to a Proximitor, which then interfaces with a 3500 Rack. Digital network communication only occurs at the monitor or rack level.
Q4: What is the benefit of the -05 Multiple Agency Approval?
A4: The -05 option provides universal certification (ATEX, IECEx, and CSA). This allows a single part number to be used across global facilities, simplifying inventory for multinational companies and ensuring compliance in explosive atmospheres.
