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Bently Nevada 330880-28-40-058-01-02 PROXPAC XL Proximity Transducer Assembly

The Bently Nevada 330880-28-40-058-01-02, also cataloged as the 330880 PROXPAC XL Proximity Transducer Assembly, operates as a dedicated hardware component for non-contact shaft displacement measurement and vibration monitoring within Bently Nevada TSI monitoring systems.

Hardware Specifications

Parameter	Specification
Model	330880-28-40-058-01-02
Brand	Bently Nevada
Product Type	PROXPAC XL Proximity Transducer Assembly
Probe Type	3300 XL 8 mm eddy-current proximity probe
Probe Diameter	8 mm
Measurement Function	Shaft vibration, axial position, and rotational speed measurement
Linear Range	2.0 mm (80 mils)
Typical Measurement Range	0.25 mm to 2.25 mm (10 mils to 90 mils)
Incremental Scale Factor	7.87 V/mm (200 mV/mil) +/-5%
Frequency Response	0 Hz to 10 kHz (+0, -3 dB)
Power Supply Voltage	-17.5 VDC to -26 VDC without barriers; -23 VDC to -26 VDC with barriers
Output Impedance	50 Ohm nominal
Housing Material	Glass and conductive fiber-reinforced Polyphenylene Sulfide (PPS)
Protection Rating	IP66 / Type 4X
Operating Temp	Probe and housing: -51 deg C to +177 deg C; integrated Proximitor: -51 deg C to +100 deg C
Humidity Range	0 to 95% non-condensing
Impact Resistance	Up to 7 Joules at ambient temperature
Standoff Length	4.0 inches (102 mm)
Probe Penetration	5.8 inches (147 mm)
Mounting Thread	3/4-14 NPT
Conduit Configuration	One 3/4-14 NPT fitting and two plugs
Weight	Approx. 1.0 kg to 1.5 kg depending on configuration
Dimensions	Configuration dependent; includes 4.0 inch standoff and 5.8 inch probe penetration
Power Consumption	Supplied through integrated Proximitor electrical circuit

Eddy-Current Probe Scaling and Rotor Dynamics Monitoring

The 330880-28-40-058-01-02 uses a 3300 XL 8 mm eddy-current probe structure to convert shaft displacement into proportional voltage output. Therefore, the system maintains a calibrated scale factor of 200 mV/mil for vibration and position analysis.

The integrated Proximitor performs signal conditioning inside the PPS housing. As a result, the assembly removes the external extension cable normally required between a conventional probe and signal conditioner. This configuration reduces installation complexity and improves mechanical protection.

For TSI applications, the system supports rotor dynamics analysis by providing stable shaft displacement signals. In addition, technicians can validate probe gap conditions through gap voltage measurement, with typical Bently Nevada installations targeting approximately -10 VDC for correct probe positioning.

Frequently Asked Questions

Q: Does the 330880-28-40-058-01-02 require an external extension cable?
A: No. The PROXPAC XL design integrates the Proximitor directly into the housing, eliminating the external probe-to-sensor extension cable.

Q: What measurement principle does this assembly use?
A: The assembly uses an eddy-current proximity measurement principle to detect shaft displacement without physical contact.

Q: What installation factors affect measurement accuracy?
A: Proper probe mounting, correct gap voltage adjustment, suitable grounding practices, and controlled cable routing conditions affect signal quality.

Field Installation Guidelines

• Install the 3/4-14 NPT mounting connection with sufficient mechanical engagement and verify thread sealing requirements according to site standards.
• Position the probe tip according to the required shaft clearance and confirm the operating gap voltage before commissioning.
• Route signal wiring away from high-current power cables to reduce electromagnetic interference.
• Connect shielding according to plant grounding practices and avoid multiple ground paths that may introduce signal noise.
• Verify the PPS housing condition before operation because mechanical damage can affect environmental protection performance.
• Confirm the integrated Proximitor temperature limit before selecting the installation location.

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