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Bently Nevada 3300 XL proximity probes | 330103 / 330102 / 330104 / 330701 models and selection guide
Covers 8 mm and 11 mm eddy current probes, with thread, armor and cable length compared in one place, for use with the 3300 XL Proximitor Sensor in rotating machinery condition monitoring.
What is a 3300 XL proximity probe?
The Bently Nevada 3300 XL series is an industry standard for rotating machinery condition monitoring. The probe uses the eddy current principle to measure, without contact, the radial vibration and axial position of the shaft relative to the bearing housing. It outputs a voltage of −1 to −17 Vdc proportional to the gap, which the 3300 XL Proximitor Sensor conditions and sends to a protection system or DCS.
Typical applications include steam turbines, gas turbines, centrifugal compressors, pumps, blowers and large motors. The probe is installed permanently in the bearing housing for 24-hour continuous monitoring and is an essential front-end sensor in predictive maintenance.
Models on this page
| Model | Series | Probe size | Thread | Armor | Case length | Cable length | Connector |
|---|---|---|---|---|---|---|---|
| 330103-00-18-10-02-00 | 330103 | 8 mm | M10 × 1 | No | 180 mm | 1.0 m | ClickLoc standard |
| 330103-00-21-10-02-00 | 330103 | 8 mm | M10 × 1 | No | 210 mm | 1.0 m | ClickLoc standard |
| 330103-00-04-10-01-00 | 330103 | 8 mm | M10 × 1 | No | 40 mm | 1.0 m | ClickLoc with protector |
| 330104-00-18-10-02 | 330104 | 8 mm | M10 × 1 | Yes | 180 mm | 1.0 m | ClickLoc standard |
| 330102-00-63-05-02 | 330102 | 8 mm | 3/8-24 UNF | Yes | 6.3 in (≈160 mm) | 0.5 m | ClickLoc standard |
| 330102-00-40-05-02-05 | 330102 | 8 mm | 3/8-24 UNF | Yes | 4.0 in (≈102 mm) | 0.5 m | ClickLoc standard |
| 330701-00-20-10-11-05 | 330701 | 11 mm | 1/2-20 UNF | No | 2.0 in (≈51 mm) | 1.0 m | ClickLoc |
Selection note: the 8 mm probe has a 2 mm linear range (0.25–2.3 mm) for most radial vibration measurements; the 11 mm probe has a 4 mm (160 mil) linear range for larger gaps or axial position measurement. The thread must match the existing mounting hole in the bearing housing — M10 × 1 is common on metric machines, 3/8-24 UNF and 1/2-20 UNF on imperial machines.
Key specifications
| Parameter | Value |
|---|---|
| Measuring principle | Eddy current, contactless |
| 8 mm probe linear range | 2 mm (80 mil); gap 0.25–2.3 mm |
| 11 mm probe linear range | 4 mm (160 mil) |
| Output voltage | −1 to −17 Vdc (about −9 Vdc at the recommended 1.27 mm gap) |
| Operating temperature | −52 to +177°C (cable rated to +260°C) |
| Materials | Tip: PPS (polyphenylene sulfide); case: AISI 303 / 304 stainless steel |
| Cable | 75 Ω coaxial, 3.68 mm OD |
| Connector | ClickLoc miniature coaxial connector (gold-plated brass) |
| Max. distance | Probe to Proximitor Sensor up to 305 m |
| Seal | Viton O-ring differential pressure seal |
| Mounting torque | Recommended 11.2 N·m (100 in·lbf); max. 33.9 N·m |
| Weight | Approx. 323 g/m (per cable length) |
Selection checklist
| Aspect | Recommendation |
|---|---|
| Probe size | 8 mm (330103 / 330102 / 330104) for most radial vibration; 11 mm (330701) for a larger range or axial position |
| Thread | Metric machines: M10 × 1 (330103 / 330104); imperial machines: 3/8-24 UNF (330102) or 1/2-20 UNF (330701) |
| Armor | Outdoors or with high shock and vibration, choose armored models (330102 / 330104); for standard indoor use, unarmored (330103 / 330701) costs less |
| Case length | Choose by mounting depth — short case (40 mm) for shallow holes; long case (180–210 mm) for deep holes or passing through extra structure |
| Cable length | 0.5 m when the Proximitor Sensor is mounted close by; 1.0 m as the general choice |
Complete measurement system: probe + 3300 XL extension cable + 3300 XL Proximitor Sensor = a complete eddy current measurement loop. All three are fully interchangeable with no individual calibration matching. For help with system matching, please email us.
Related: Bently Nevada 3300 XL parts (330103 / 330130 / 330180) · Bently Nevada 3300 XL proximity probe 330105 · Bently Nevada 3500/42-04 vibration monitor module
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