Product Overview

The Bently Nevada 330103-06-20-10-02-00 is a high-precision 3300 XL 8 mm proximity probe designed for critical machinery condition monitoring. Operating on the eddy current principle, this sensor delivers continuous, non-contact measurement of static and dynamic gaps between the probe tip and the target shaft. It provides crucial data for measuring radial vibration, axial position, and keyphasor reference in high-speed rotating assets like steam turbines, compressors, and large induction motors. By feeding accurate analog signals directly into the Bently Nevada 3500 Monitoring System or a plant DCS, it ensures reliable protection, minimizes unscheduled downtime, and supports automated emergency shutdown (ESD) protocols in severe industrial environments.

Suffix Configuration Logic

The specific alphanumeric sequence of the 330103-06-20-10-02-00 model number determines its physical build and engineering compatibility according to Bently Nevada's configuration standard.

Unthreaded Length Option (-06)

This option specifies an unthreaded length of 0.6 inches, allowing precise mechanical positioning within the mounting bracket or housing before locking the probe into place.

Overall Case Length Option (-20)

This represents a 2.0-inch overall case length, providing the necessary rigid barrel depth to penetrate machinery casings or bearing housings safely.

Total Length Option (-10)

This indicates a 1.0-meter (3.3 feet) total cable length. The internal capacitance and inductance of this cable match the 3300 XL Proximitor Sensor circuitry perfectly to prevent measurement drift.

Connector and Cable Option (-02)

This designates a miniature coaxial connector with a cable that includes standard protective features, optimizing the signal-to-noise ratio across the run.

Agency Approval Option (-00)

This signifies the standard configuration without specific hazardous area approvals, ideal for general industrial applications where explosive atmospheres are not present.

Hardware Specifications

Field Deployment Guidelines

Achieving accurate vibration readings depends entirely on correct physical installation and electrical isolation during commissioning.

Gap Voltage Calibration

Mount the probe and adjust its physical distance from the shaft target using a digital multimeter connected to the Proximitor Sensor output. Set the initial mechanical gap to read -10.0 VDC across the signal and common terminals, which positions the probe precisely in the center of its linear voltage range.

Cable Bending Radius Restrictions

Avoid sharp crimps or tight routing paths that deform the internal coaxial geometry. Maintain a minimum bend radius of 25.4 mm (1.0 inch) for the extension cable to prevent structural impedance changes that disrupt the high-frequency RF signal field.

Electrical Isolation and Grounding

Isolate the probe case from the machine housing if stray currents or ground loops are present in the plant grid. Connect the extension cable shield only at the Proximitor end, routing it directly to the dedicated instrument ground bar rather than the structural machinery steel.

System Integration Advantages

This proximity probe operates seamlessly within a broader Turbine Supervisory Instrumentation (TSI) architecture. The internal eddy current circuitry drives a clean, low-impedance signal over long distances without attenuation, allowing direct interface with modern control platforms like Honeywell Experion PKS or Emerson DeltaV through standard input modules.

The rugged Polyphenylene Sulfide (PPS) tip shrugs off continuous exposure to synthetic lubrication oils, high moisture, and harsh chemical vapors inside bearing housings. Its thermal stability guarantees minimal scale factor drift, ensuring that sudden phase changes or amplitude spikes reflect actual rotor dynamics rather than thermal stress on the sensor components.

Supply and Procurement Scope

Each hardware shipment contains specific components ready for field installation.

(1) One Bently Nevada 330103-06-20-10-02-00 Proximity Probe with integrated 1.0-meter coaxial cable.

(2) Factory-installed miniature coaxial connector with silicone connector protector boot.

(3) Removable locknuts for rigid mounting configuration.

(4) Material traceability certification and final factory calibration report.

Dispatch and Logistics

Our logistics network guarantees rapid deployment to prevent extended downtime at your facility.

All orders ship within 3-5 days after payment verification concludes. We route packages exclusively through premium global carriers, including DHL, FedEx, and UPS, ensuring fully tracked and expedited transit. Every probe undergoes careful wrapping in anti-static industrial packaging and high-density foam padding to shield delicate internal electronics from electrostatic discharge and physical impact during global transit.

Field Technical Insights

Q1: Can I connect this 1.0-meter probe directly to a 9.0-meter extension cable if my Proximitor requires a 5.0-meter system?

A1: No, you cannot mix system lengths. The Bently Nevada 3300 XL system requires the total length of the probe and extension cable to match the tuning of the Proximitor exactly, which is either 5.0 meters or 9.0 meters. Connecting a 1.0-meter probe to a 9.0-meter cable creates a 10.0-meter system, which invalidates the calibration, changes the scale factor, and causes massive measurement errors.

Q2: What is the correct way to identify a fault if the DCS reports a "Sensor Limit" or "Not OK" status?

A2: Check the DC voltage across the Proximitor "OUT" and "COM" terminals using a multimeter. A healthy system resting within the linear range outputs between -2.0 VDC and -18.0 VDC. If the meter displays a voltage closer to 0 VDC, a short circuit exists in the cable or connector. If the reading jumps to approximately -23 VDC, the circuit is open, indicating a broken center conductor or a disconnected plug.

Q3: Why does the shaft material matter when installing this proximity probe?

A3: Eddy current probes are calibrated at the factory for AISI 4140 steel targets. If you mount this probe facing a shaft made of a different material, such as stainless steel or aluminum, the different electrical conductivity and magnetic permeability will alter the sensor's output slope. This discrepancy requires custom cross-calibration to ensure accurate vibration amplitude data.