The Bently Nevada 330881-28-00-265-00-02, also cataloged as the 330881 Proximity Transducer, operates as a dedicated hardware component for integrated non-contacting vibration and displacement measurement within PROXPAC XL monitoring systems.

Suffix & Model Matrix

The 330881-28-00-265-00-02 part number denotes a high-density integrated transducer assembly. The parameters specify an 8 mm probe tip diameter, 1/2-20 UNF probe thread, and a 26.5 meter integral coaxial cable. This configuration is engineered for applications where external Proximitor housing space is limited, providing direct signal conditioning within the transducer assembly itself.

Hardware Specifications

Mechanical Monitoring & Eddy-Current Transduction

High-fidelity rotor dynamics data requires rigorous impedance matching between the sensing tip and the integral 26.5 meter cable. To ensure operational accuracy, the transducer must be mounted to achieve a target gap voltage of -10 VDC. Deviation from this voltage indicates an out-of-range installation or target misalignment. Cross-talk suppression is achieved through strict adherence to installation spatial requirements, preventing interference from adjacent proximity transducers in high-density monitoring arrays.

## Ordering info

• 1x 330881-28-00-265-00-02 PROXPAC XL Transducer

• 1x Installation documentation package

• 1x Protective connector cap

• 1x Factory calibration report

Field Installation Guidelines

• Mechanical Mounting: Mount the transducer in a boss machined square to the shaft to prevent angular error.

• Torque Specs: Secure the lock nut to 5.1 N-m (45 in-lb). Avoid excessive torque, which risks housing thread deformation.

• Cable Management: Secure the 26.5 meter cable to prevent vibration-induced fatigue. Maintain a minimum bend radius of 25 mm.

• Grounding: The transducer case must be electrically bonded to the machine ground if required for EMI suppression. Ensure signal shield isolation at the instrumentation end.

Frequently Asked Questions

• Can the integral cable be cut to size? No, the system is calibrated for the specific 26.5 meter length; field modifications alter electrical impedance and signal accuracy.

• Is this device hot-swappable? No, remove system power prior to disconnection to prevent electrical transients that may damage internal signal conditioning circuits.

• How is the probe tip protected? A PPS plastic tip is utilized, which is chemically inert but susceptible to mechanical impact; use the provided cap during installation.

• What target material is required for calibration? Calibration is performed on AISI 4140 steel; using different target materials will induce measurement non-linearity.

• Can it be used in explosive environments? Yes, provided it is part of an approved intrinsically safe installation using recognized safety barriers.

• What happens if the gap voltage exceeds -18 VDC? The transducer output will clip, leading to signal saturation and loss of vibration data.

• Does this device require external conditioning? No, the PROXPAC XL incorporates the Proximitor function within the assembly.

• Why is the 8 mm tip diameter selected? It provides the standard balance of measurement range and sensitivity required for typical rotating equipment vibration monitoring.