The Bently Nevada 330103-00-11-50-02-05 stands as a critical industrial sentinel, specifically designed for non-contact displacement and vibration monitoring in high-speed rotating machinery. As a key component of the 3300 XL 8mm Transducer System, this Reverse Mount probe captures high-fidelity data from steam turbines, centrifugal compressors, and heavy-duty pumps. It utilizes advanced eddy current technology to sense the microscopic gap between the probe tip and the target shaft without physical contact, ensuring zero mechanical wear over decades of operation.
This probe acts as the frontline of Turbine Supervisory Instrumentation (TSI), detecting early-stage imbalances, misalignments, and bearing degradations. By delivering precise radial vibration and axial position data, the 330103 probe empowers maintenance teams to shift from reactive repairs to sophisticated predictive maintenance strategies. Its robust construction guarantees signal integrity in the most punishing industrial environments, safeguarding high-value assets against catastrophic failure.
The model 330103-00-11-50-02-05 follows a precise modular logic. Each segment of the part number determines the mechanical fit and electrical calibration of the sensor:
The 00 indicates a 0.0-inch unthreaded length. For this reverse-mount model, the entire 3/8-24 UNF body is threaded, providing maximum flexibility and stability when installing the probe into internal brackets or housings.
This designates an 1.1-inch overall case length. The compact 330103 housing allows for installation in tight internal clearances where standard forward-mount probes cannot reach.
The 50 specifies a 5.0-meter (approx. 16.4 feet) total system length. The probe lead, extension cable, and Proximitor must all share this 5.0m calibration to maintain the precise 200 mV/mil scale factor required for accurate readings.
The 02 option provides 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 use in Class I, Division 1 and 2 hazardous areas globally.
| Feature | Specification Details |
| Probe Tip Diameter | 8.0 mm (0.315 in) |
| Mounting Style | Reverse Mount (3/8-24 UNF threads) |
| Linear Range | 2.0 mm (80 mils) |
| Sensitivity (ISF) | 7.87 V/mm (200 mV/mil) |
| Target Material | AISI 4140 Steel (Standard) |
| Operating Temperature | -51 °C to +177 °C (-60 °F to +351 °F) |
| Pressure Rating | Sealing up to 70 psi (4.8 bar) |
| Ingress Protection | IP68 / NEMA 4X (With protectors) |
Achieving laboratory-grade precision in the field requires strict adherence to Bently Nevada's mechanical and electrical standards:
Engineers must set the initial "Static Gap" using a Digital Multimeter (DMM). For a 3300 XL 8mm system, the center 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 securing the locknuts.
Unlike standard probes, the 330103 is a reverse-mount design. This requires installation through a bracket inside the machine housing. Ensure the mounting bracket is rigid; any bracket resonance will be interpreted by the sensor as "false vibration," leading to incorrect data.
Maintain a minimum bend radius of 25.4 mm (1.0 inch) for the coaxial lead. Avoid pulling the cable through tight conduits that could stretch the internal conductor. Use the provided connector protectors to prevent oil and moisture from entering the coaxial connection, which is the leading cause of "signal drift."
High-Performance PPS Tip: The probe tip uses Polyphenylene Sulfide (PPS), a high-performance thermoplastic that resists chemical corrosion and remains stable at temperatures up to 177°C.
TSI Seamless Integration: This probe communicates natively with Bently Nevada 3500 series monitors, ensuring immediate data visualization in System 1 software without additional calibration.
Gold-Plated ClickLoc Connectors: Gold-plated contacts ensure a low-resistance connection and prevent oxidation, a critical feature for coastal or high-humidity offshore environments.
EMI/RFI Immunity: Advanced shielding prevents electrical noise from Variable Frequency Drives (VFDs) and high-voltage motors from corrupting the delicate vibration signal.
Q1: How do I determine if a 330103 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, while a near-zero reading suggests a short.
Q2: What is the benefit of the "Reverse Mount" design?
A2: Reverse mount probes are used when there is no access to the probe from the outside of the machine. They are typically installed in internal bearing housings or specialized brackets, allowing for a more compact overall machine footprint.
Q3: Can this probe connect to an Ethernet router?
A3: No. This is a common error in logistics data. The 330103 is a passive analog sensor. It provides a raw signal to a Proximitor Sensor, which then interfaces with a 3500 Rack. Digital communication only occurs at the monitor/rack level.
Q4: Is the 330103-00-11-50-02-05 compatible with older 3300 systems?
A4: Yes. The 3300 XL series maintains backward compatibility with legacy 3300 series 8mm components. However, for maximum accuracy and EMI protection, we recommend using a complete 3300 XL transducer system.
