Bently Nevada 330101-00-84-20-02-CN 3300 XL 8 mm Probe, 3/8-24 UNF Thread

330101-00-84-20-02-CN Decoded: What Each Segment Means for Your Turbine Installation

The 3300 XL 8 mm probe family encodes its mechanical and electrical configuration directly in the part number. Reading 330101-00-84-20-02-CN segment by segment tells an engineer whether the unit will physically fit the existing probe holder, whether the tip material tolerates the process temperature, and how much cable length is available before a junction box. That matters because a probe that is electrically correct but mechanically wrong will not seat in the holder, and a probe that is mechanically correct but has the wrong cable length forces a field re-wiring job during an outage window.

Decoded: 330101 = 3300 XL 8 mm probe platform, 3/8-24 UNF thread, no armor. 00 = unthreaded length option 00 (no unthreaded section). 84 = 84 mm case length. 20 = 2.0 m total cable length. 02 = ClickLoc coaxial connector. CN = country of origin / approval designation carried on this variant.

The 2 mm (80 mil) linear range and 7.87 V/mm (200 mV/mil) incremental scale factor are identical across the330101 platform, so signal conditioning in the connected monitor does not need to change when this probe replaces another 330101 variant. That interchangeability is the main reason to buy within the 330101 family rather than across 330102/330103.

Where the 330101-00-84-20-02-CN Differs from Its Closest Siblings

Three configurations share the exact 330101-00-84 case and cable geometry. Choosing between them comes down to approval requirement and connector termination, not performance.

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Radial Vibration Monitoring on Steam Turbines and Compressors

This probe is used for radial shaft vibration on steam turbines, centrifugal compressors and generator sets. The PPS (polyphenylene sulfide) tip combined with an AISI 303/304 stainless steel case tolerates the temperature and pressure profiles typical of turbine casings. The 2 mm linear range covers the peak-to-peak shaft movement seen during start-up and coast-down, and the 7.87 V/mm scale factor lets the monitor alarm on displacement and velocity without additional scaling.

Weight is 323 g/m (11.4 oz) including cable, which matters when the probe is supported by an armored retention bracket on a long cable run.

Gap Setting and Probe Positioning

For radial vibration monitoring, set the recommended gap to -9 Vdc — approximately 1.27 mm (50 mils) from the target surface. Mount the probe in the forward direction in a compatible probe holder and confirm the gap voltage before energising the monitor channel.

The probe seals differential pressure between tip and case with a Viton O-ring. Do not disassemble the probe in the field; a replacement probe is the correct remedy if the seal is suspect.

TipLoc and CableLoc Mechanical Design

The patented TipLoc and CableLoc construction is what separates the 3300 XL platform from earlier 3300-series probes. CableLoc gives 330 N (75 lbf) of cable pull strength at the connector, which prevents the most common field failure: a cable tug during installation tearing the termination out of the probe body. TipLoc locates the tip relative to the case so gap calibration transfers predictably between probes of the same variant.

Connector and Cable Integration

The miniature coaxial ClickLoc connector is a push-to-connect interface that locks by rotation, so it does not require a torque wrench and cannot be wired incorrectly by polarity convention. The 2.0 m cable length on this variant is the full run from probe head to the junction box — if the existing cable route needs more length, an extension cable must be specified separately and is a different part number. The probe connects to a 3300 XL monitor channel through the standard Proximitor sensor wiring.

Ordering and Verification Notes

Before ordering a replacement, confirm three mechanical facts against the unit being removed: the 3/8-24 UNF thread, the 84 mm case length, and the gap setting your monitor expects. If the removed probe is a different variant in the 330101-00-84 family, the table above identifies the direct cross-reference.

Supply & terms: Stock status: In Stock · Condition: New · Warranty: One Year · Origin: US. Listed by AutoDCS Tech Parts Team · Last updated 2026-10-07.

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