The Bently Nevada 330101-00-11-15-12-CN is an 8 mm proximity probe assembly designed for non-contacting radial and axial position measurement on rotating machinery. This component serves as the primary sensor within the 3300 XL transducer system, converting physical shaft displacement into a proportional voltage signal.

Hardware Specifications

Physical and Electrical Configuration

This unit features a standard 8 mm diameter PPS tip mounted in an AISI 303 stainless steel housing. The probe assembly includes an integral coaxial cable terminated with a connector compatible with 3300 XL Proximitor sensors. The total system calibration—consisting of the probe, extension cable, and Proximitor—is optimized for precision monitoring across the specified linear range.

Operational Requirements

• Gap Voltage Validation: During initial commissioning, the gap voltage must be adjusted to the -10 VDC target. This ensures the shaft target is centered within the linear operating range of the sensor.

• Signal Integrity: Cross-talk suppression depends on the maintenance of shield continuity. The coaxial shield must be grounded at the monitor end only to prevent ground loops that introduce electromagnetic noise into the rotor dynamics data.

• Environmental Constraints: The probe assembly is rated for operation between -35 deg C and +177 deg C. Exposure to temperatures exceeding this limit will compromise the dielectric properties of the PPS tip and internal cabling.

• Installation Torque: Threaded probe bodies should be secured into mounting brackets using the provided jam nuts, torqued to 15 Nm to prevent vibration-induced loosening.

• Surface Considerations: Measurement accuracy requires a conductive, non-magnetic target surface. Scratches, burrs, or surface coating variations will modulate the eddy-current field and degrade signal quality.

Handling and Transit

Units are protected by anti-static industrial packaging to prevent electrostatic discharge damage to the internal coil and coaxial dielectric. Shipping includes the probe, mounting hardware, and protective connector dust covers. Lead times are typically 2-7 days, with delivery coordinated through DHL, FEDEX, or UPS.

Technical Queries

• Compatibility: This probe is impedance-matched specifically to the 3300 XL Proximitor and cannot be used with legacy 3300 standard components.

• Cable Integrity: The coaxial cable is factory-calibrated for specific capacitance; cutting or splicing the cable is not permitted, as it alters the signal frequency response.

• Housing Grounding: The probe housing is at the same electrical potential as the machine casing; ensure the mounting bracket is properly bonded to the machine frame to prevent floating potentials.

• Failure Indicators: A sudden shift in gap voltage or a high-frequency noise floor (50/60 Hz) typically indicates a cable shield break or a connector-to-terminal short.

• Cleaning: Remove residual oil or debris from the connector interface before mating to prevent resistive leakage paths that could skew the probe signal.

• Tip Damage: Minor tip abrasion is generally acceptable, but structural cracking of the PPS tip necessitates immediate sensor replacement to ensure electrical field uniformity.

• Redundancy: In critical machinery monitoring, probes are typically installed in 2oo2 (two-out-of-two) or redundant configurations to ensure data availability during a single sensor failure.

• Testing: Verification of the probe is performed using a static calibration stand; field testing is limited to gap voltage and output continuity checks.