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Bently Nevada 330801-28-04-050-00-02 PROXPAC XL Proximity Transducer Assembly

The Bently Nevada 330801-28-04-050-00-02, also cataloged as the 330801 PROXPAC XL Proximity Transducer Assembly, operates as a dedicated hardware component for non-contact shaft displacement and vibration measurement within Bently Nevada machinery protection systems.

Hardware Specifications

Parameter	Specification
Model	330801-28-04-050-00-02
Brand	Bently Nevada
Product Type	PROXPAC XL Proximity Transducer Assembly
Origin	USA
Weight	Approximately 1.0 kg
Dimensions	Integrated enclosure with 40 mm standoff adapter and 50 mm probe penetration
Operating Temp	Probe tip: -51 deg C to +177 deg C; Housing and Proximitor: -34 deg C to +85 deg C
Power Consumption	Powered by -17.5 VDC to -26 VDC, typically -24 VDC
Probe Type	3300 XL 8 mm Eddy Current Proximity Probe
Measurement Range	2.0 mm linear range (80 mils)
Target Material	AISI 4140 Steel calibration target
Sensitivity	7.87 V/mm (200 mV/mil) nominal
Frequency Response	0 to 10 kHz
Output Signal	Analog negative voltage, -1 VDC to -17 VDC proportional to gap distance
Housing Material	Glass-reinforced Polyphenylene Sulfide (PPS) thermoplastic
Ingress Protection	IP66 / IP67 / Type 4X
Mounting Thread	3/4-14 NPT
Standoff Adapter	40 mm
Probe Penetration	50 mm
Fittings Configuration	No fittings, supplied with two plugs and two washers

Eddy-Current Probe Scaling and Rotor Dynamics Measurement

The 330801-28-04-050-00-02 integrates a 3300 XL 8 mm eddy-current probe system with an internal Proximitor sensor. Therefore, the assembly directly converts shaft movement into a proportional analog voltage signal for machinery monitoring inputs.

The eddy-current probe scaling provides a nominal 7.87 V/mm conversion factor, allowing monitoring systems to evaluate shaft displacement, radial vibration, and axial position. In addition, the system supports rotor dynamics analysis by maintaining consistent gap measurement performance across rotating equipment operating conditions.

The probe system requires gap voltage validation during installation. Engineers typically verify the operating gap near the -10 VDC target point to confirm correct probe positioning and measurement range before machinery operation.

Frequently Asked Questions

Q: Does the 330801-28-04-050-00-02 require an external Proximitor sensor?
A: No. The PROXPAC XL assembly integrates the Proximitor sensor inside the field enclosure, eliminating the need for a separate external Proximitor installation.

Q: What type of signal does this assembly provide to a monitoring system?
A: The assembly provides an analog negative voltage output ranging from -1 VDC to -17 VDC, proportional to the measured probe gap distance.

Q: Can the assembly monitor both vibration and shaft position?
A: Yes. The 3300 XL 8 mm probe technology supports radial vibration, axial position, and shaft displacement measurements when connected to compatible Bently Nevada monitoring platforms.

Field Installation Guidelines

Install the 330801-28-04-050-00-02 using the specified 3/4-14 NPT mounting interface and maintain correct mechanical alignment between the probe tip and rotating target surface.

Verify the probe gap voltage before commissioning. The installation position should allow the system to achieve the required measurement range, with typical verification performed around the -10 VDC gap reference.

Route signal wiring away from high-current power cables and variable frequency drive conductors to reduce electrical interference. Connect cable shields according to site grounding practices and avoid creating additional ground loops.

Inspect the PPS enclosure, threaded connections, and sealing components before operation to maintain IP66 / IP67 / Type 4X environmental protection.

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