The Bently Nevada 330881-28-06-105-00-02, also cataloged as the 330881 Proximity Transducer, operates as a dedicated hardware component for non-contacting vibration and position monitoring within PROXPAC XL integrated systems.

Configuration Matrix

The 330881-28-06-105-00-02 represents a specific assembly where the transducer probe and signal conditioning circuitry are integrated into a single unit. The part number parameters specify a 1/2-20 UNF probe thread, an 8 mm tip diameter, and a 10.5 meter integral coaxial cable, designed for applications requiring high-density integration without external Proximitor housings.

Hardware Specifications

Transducer Signal Integrity and Rotor Dynamics

This transducer utilizes the eddy-current principle to provide precise rotor dynamics data. Accurate probe scaling is maintained by factory-calibrated impedance matching between the sensor tip and the 10.5 meter integral cable. Users must ensure that the transducer is installed to achieve a -10 VDC gap voltage target to remain within the linear operating range. Furthermore, cross-talk suppression is achieved by following strict spatial separation guidelines, which prevents electromagnetic field interference between adjacent proximity transducers in multi-channel installations.

## Ordering info

• 1x 330881-28-06-105-00-02 PROXPAC XL Transducer

• 1x Installation documentation package

• 1x Protective connector cap

• 1x Factory calibration verification record

Field Installation Guidelines

• Mechanical Mounting: Ensure the mounting boss is drilled and tapped square to the target surface to prevent angular alignment deviations.

• Torque Specifications: Secure the lock nut to 5.1 N-m (45 in-lb). Avoid excessive torque, which can damage the probe housing threads.

• Grounding: The transducer case must be electrically bonded to the machine ground if required for EMI/RFI mitigation. Ensure the shield is isolated at the instrumentation end.

• Wiring: Protect the integral cable from physical strain. Maintain a minimum bend radius of 25 mm to prevent center conductor damage.

Frequently Asked Questions

• Can I cut the integral cable to length? No, the system is impedance-matched for the specific 10.5 meter length; modifying the cable invalidates the sensitivity and calibration.

• Is the PROXPAC XL housing field-repairable? No, the assembly is hermetically sealed to prevent environmental contamination of internal electronics.

• What target material is required? Calibration is performed on AISI 4140 steel. Deviations in target material will result in non-linear measurement output.

• What is the consequence of signal clipping? If the gap voltage exceeds the -18 VDC limit, the output signal will clip, resulting in loss of vibration data.

• Does this device support hot-swapping? No, remove system power before disconnecting to prevent transients that could damage the internal conditioning circuits.

• How is the probe tip protected? The PPS plastic tip is chemical-resistant but fragile. Use the provided protective cap during transit and installation.

• Can this be used in explosive environments? Yes, when installed as part of an intrinsically safe system using appropriate safety barriers.

• What is the purpose of the 8 mm tip diameter? It is the standard size for 3300 XL series transducer systems, providing an optimal balance of measurement range and sensitivity.