The Bently Nevada 330801-28-05-101-03-02, also cataloged as the 330801 3300 XL PROXPAC XL Proximity Transducer Assembly, operates as a dedicated hardware component for non-contact shaft displacement measurement within Bently Nevada 3300 XL mechanical monitoring systems.
Hardware Specifications
Parameter
Specification
Model
330801-28-05-101-03-02
Brand
Bently Nevada
Origin
USA
Operating Temp
Probe: -51 deg C to +177 deg C; Proximitor Sensor / Housing: -51 deg C to +85 deg C
Power Consumption
Supplied through compatible 3300 XL Proximitor Sensor system; value not specified
Product Series
3300 XL PROXPAC XL Proximity Transducer Assembly
Probe Type
3300 XL 8 mm Eddy Current Proximity Probe
Measurement Method
Non-contact eddy current displacement measurement
Measurement Range
2.0 mm (approximately 80 mils)
Scale Factor
7.87 V/mm (200 mV/mil) nominal
Target Material
AISI 4140 Steel calibration target
Mounting Thread
3/4-14 NPT
Probe Penetration
101 mm
Standoff Adapter Length
50 mm
Frequency Response
0 Hz to 10 kHz (0 to 600,000 cpm)
Environmental Protection
Weatherproof sealed housing, IP66 / Type 4X rated
Eddy Current Measurement and Rotor Dynamics Characteristics
The 3300 XL PROXPAC assembly uses an eddy-current sensing principle to convert shaft displacement into proportional electrical output signals. The integrated 3300 XL 8 mm probe provides a nominal scale factor of 200 mV/mil, allowing the connected monitoring system to evaluate shaft vibration and axial position changes.
The system supports rotor dynamics analysis by measuring dynamic shaft movement without mechanical contact. Therefore, the probe assembly avoids wear between the sensor and rotating target surface. The measurement chain requires correct gap voltage validation, with Bently Nevada proximity systems typically using a -10 VDC target gap voltage reference for proper probe operating range verification.
The probe assembly also maintains signal stability through controlled electromagnetic characteristics, which reduces measurement interference during rotating equipment operation. Proper probe installation and cable routing help maintain eddy-current signal integrity.
Frequently Asked Questions
Q: What measurement signals can the 330801-28-05-101-03-02 assembly provide?
A: The assembly provides non-contact shaft displacement measurements for radial vibration, axial position, and speed-related monitoring when connected with compatible 3300 XL Proximitor Sensor electronics.
Q: Does the assembly require mechanical contact with the rotating shaft?
A: No. The 3300 XL PROXPAC XL assembly uses an eddy-current proximity sensing method and measures the target surface without physical contact.
Q: How is the probe operating condition verified during installation?
A: Technicians verify probe gap voltage and signal output through the connected proximity system. Bently Nevada systems commonly use a -10 VDC gap voltage reference for probe positioning validation.
Field Installation Guidelines
Install the 330801-28-05-101-03-02 assembly using the specified 3/4-14 NPT mounting interface and ensure correct mechanical alignment with the monitored shaft surface.
Maintain proper probe clearance according to the connected 3300 XL Proximitor Sensor calibration requirements. Verify the target surface condition before commissioning because surface damage or incorrect material characteristics can affect eddy-current measurement accuracy.
Route the extension cable away from high-current power conductors and electromagnetic interference sources. Ground cable shields according to site instrumentation standards to reduce electrical noise coupling.
After installation, confirm gap voltage, output signal stability, and mechanical mounting integrity before placing the monitoring channel into service.
