Bently Nevada 330881-16-00-385-06-02 PROXPAC XL Proximity Transducer

Item Overview

This module 330881-16-00-385-06-02 is a PROXPAC XL Proximity Transducer designed for non-contact vibration and position monitoring of rotating machinery. It integrates a 3300 XL 8 mm probe into a protective housing, featuring an ultra-long 385 mm probe penetration for deep machinery inspection. The housing is made of Polyphenylene Sulfide (PPS) with glass and conductive fibers, which replaces traditional steel and aluminum to improve strength and dissipate electrostatic charges. This model is rated Type 4X and IP66 for severe environments, includes 3/4-14 NPT mounting threads, and comes with one 3/4-14 NPT fitting, one SST reducer, and two plugs.

Performance Specifications

Probe and Approvals:

1 6

3300 XL 8 mm probe without approvals

Standoff Adapter:

0 0

No standoff adapter

Probe Penetration:

3 8 5

385 mm

Fittings:

0 6

One 3/4-14 NPT fitting, one 3/4- 14 NPT to 1/2-14 NPT SST reducer and two plugs

Mounting Thread:

0 2

3/4-14 NPT (required if ordering Standoff Adapter Option)

Output Resistance:

       50 Ω

Current Consumption:

       12 mA maximum

Frequency Response:

       0 to 10 kHz (+0, -3 dB) 

Application

 Radial vibration monitoring – Measures shaft vibration on fluid-film bearing machines such as steam turbines, gas turbines, compressors, and large pumps.

 Axial (thrust) position measurement – Monitors rotor displacement to prevent thrust bearing failure and rotor-to-stator rub.

 Shaft eccentricity measurement – Detects rotor bow during startup or shutdown of large turbines.

 Differential expansion monitoring – Measures relative thermal growth between rotor and stator in steam turbines and compressors.

 385 mm probe penetration – Designed for deep mounting applications where the probe must reach through thick machine casings or bearing housings.

 Self-contained system – Integrates the 3300 XL 8 mm probe and Proximitor sensor in one housing; no separate extension cable required.

 3/4-14 NPT mounting thread – Standard industrial thread for easy installation in existing mounting ports.

FAQ

Question

Answer

Q1：What is the probe penetration length?

A1: 385 mm minimum.

Q2：What is the typical gap voltage setting?

A2: -10 Vdc (operates within -2 to -18 Vdc linear range) .

Q3：What is the operating temperature range?

A3: -51°C to +177°C (-60°F to +350°F).

Q4：Does this model have hazardous area approvals?

A4: No, Option 16 = 3300 XL 8 mm probe without approvals.

Q5：What is the supply sensitivity specification?

A5: Less than 2 mV change per volt change in input voltage .

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