Configured for non-contacting displacement monitoring in mechanical platforms, the Bently Nevada 330881-28-08-090-00-02 (330881-28-08-090-00-02 Proximity Transducer) provides direct physical and electrical execution of RF-based position signal conditioning.

Suffix Model Decomposition

• 330881: Base Model (3300 XL PROXPAC Proximity Transducer)

• 28: Probe Diameter (8 mm)

• 08: Mounting Thread (Metric 3/8-24 style)

• 090: Total System Length (9.0 meters)

• 00: Connector Type (Standard connector)

• 02: Agency Approval (Multiple international standards)

Hardware Specifications

Mechanical Monitoring & TSI Characteristics

The PROXPAC XL system utilizes eddy-current probe scaling to convert shaft motion into a linear voltage signal. During installation, gap voltage validation against -10 VDC targets at the system interface is required to ensure the probe tip operates within the optimal linear range. The system supports rotor dynamics analysis by maintaining signal linearity. Cross-talk suppression is maintained through frequency-coded transducer electronics, preventing signal interference between adjacent sensors in high-density monitoring applications.

Ordering info

• 1 x 330881-28-08-090-00-02 PROXPAC XL Proximity Transducer

• 1 x Protective connector thread cap

• 1 x Installation technical documentation

Installation Guidelines

• Mechanical Mounting: Install the transducer housing to the mounting bracket; ensure the probe tip air gap is set to achieve the -10 VDC operational target.

• Cabling: Route coaxial cabling through grounded metallic conduit to prevent electromagnetic interference; observe minimum bend radius constraints.

• Grounding: Bond the transducer housing to the machine ground reference to establish a stable electrical signal return path.

• Connection Verification: Inspect all connectors for contaminants and ensure hand-tightened security prior to startup.

• Signal Validation: Confirm the static gap voltage using a high-impedance voltmeter at the transducer output before machine engagement.

Frequently Asked Questions

• Q: Is the PROXPAC XL compatible with standard external Proximitors?

  A: No, the PROXPAC XL integrates the oscillator within the transducer housing, functioning as a standalone unit without an external Proximitor.

• Q: Can the 9.0 meter cable be field-modified?

  A: No, the cable length is calibrated to the specific internal resonant frequency of the transducer; modification invalidates the scale factor.

• Q: How is the probe gap validated during installation?

  A: Measure the output voltage at the transducer signal terminals; the system target is -10 VDC at the specified nominal air gap.

• Q: What is the effect of target material on transducer output?

  A: Probe sensitivity is factory-calibrated for 4140 steel; other materials require a scaling correction factor to ensure measurement accuracy.

• Q: Is this device suitable for high-vibration environments?

  A: Yes, the unit is constructed to withstand industrial vibration profiles provided the housing is securely mounted to a rigid bracket.

• Q: Does the transducer require an external power supply?

  A: Yes, the unit requires a -24 VDC power source to excite the internal oscillator and generate the displacement signal.

• Q: What causes unstable or drifting signal readings?

  A: Instability is typically caused by loose electrical connections, ground loops, or physical damage to the probe tip/coaxial cable.

• Q: Should thread-locking compound be used during installation?

  A: No, thread-locking compounds may create an insulating barrier that disrupts the critical electrical ground path between the probe and machine housing.