Product Overview: Bently Nevada 330708-00-24-90-11-05 3300 XL 11 mm Proximity Probe
When excessive vibration threatens rotating machinery, the Bently Nevada 330708-00-24-90-11-05 3300 XL 11 mm proximity probe delivers precise, reliable measurement. This probe is designed for critical applications like turbines, compressors, and pumps, where accurate shaft displacement data is essential for condition monitoring and predictive maintenance. The 330708-00-24-90-11-05 features a PPS tip and 304 stainless steel case, with a 9-meter FluidLoc cable and ClickLoc connector for secure installation.
Technical Specifications Breakdown
| Parameter |
Value |
| Probe DC Resistance (9.0 m length) |
8.5 ± 1.1 ohms |
| Operating & Storage Temperature |
-52°C to +177°C (-62°F to +351°F) |
| Probe Case Thread |
5/8-18 UNF, max engagement 0.938 in |
| Maximum Case Torque |
45.2 N·m (400 in·lb) |
| Recommended Case Torque |
15.2 N·m (133 in·lb) |
| Connector Torque |
Finger tight, max 0.565 N·m (5 in·lb) |
| Minimum Bend Radius |
25.4 mm (1.0 in) |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 304 Stainless Steel |
| Cable Type |
75 Ω triaxial, FEP insulated |
| Total Length |
9.0 meters (29.5 feet) |
| Connector |
Miniature coaxial ClickLoc with protector |
The 330708-00-24-90-11-05 ensures accurate proximity measurements under harsh industrial conditions.
Failure Mode Prevention: Engineered for Reliability
Common failure modes in proximity probes include cable fatigue, seal leaks, and thread stripping. The 330708-00-24-90-11-05 addresses each:
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Cable fatigue: FluidLoc cable design and minimum bend radius of 25.4 mm reduce stress. The triaxial FEP insulation resists chemical and thermal degradation.
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Seal leaks: Viton O-ring seals differential pressure between tip and case. Note: probes are not pressure tested before shipment; contact custom design for pressure test needs.
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Thread stripping: Case thread 5/8-18 with max engagement 0.938 in and controlled torque values (max 45.2 N·m) prevent overtightening.
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Temperature extremes: Operating range -52°C to +177°C covers most industrial applications. Avoid exposure below -34°C to protect the pressure seal.
Application & Use Cases
The 330708-00-24-90-11-05 is ideal for vibration monitoring on steam turbines, centrifugal compressors, and large motors. In a steam turbine application, the probe mounts in a 5/8-18 threaded hole, measuring shaft radial vibration. Its 9-meter cable allows remote connection to a Bently Nevada 3300 XL system compatible with the 330708-00-24-90-11-05. The PPS tip withstands oil and moisture, while the stainless steel case resists corrosion.
Installation & Setup Guidance
Follow these steps for reliable installation:
- Select a clean, threaded hole (5/8-18 UNF) with depth at least 0.938 in.
- Apply recommended torque of 15.2 N·m (133 in·lb) — do not exceed 45.2 N·m.
- Hand-tighten the ClickLoc connector; do not exceed 0.565 N·m.
- Route cable with bend radius >25.4 mm. Secure cable to avoid vibration fatigue.
- Verify probe gap and linear range per Bently Nevada guidelines.
For temperatures below -34°C, consult factory for pressure seal precautions.
Maintenance & Reliability
Regularly inspect the cable for cuts or abrasion. Check connector for tightness. The 330708-00-24-90-11-05 requires no scheduled calibration if used within specifications. Monitor environmental temperature to avoid prolonged exposure below -34°C, which may degrade the pressure seal. The Viton O-ring provides long life in oil-rich environments.
Selection Guide & Purchasing Advice
When ordering, confirm the total length 9.0 meters (29.5 feet) with ClickLoc connector and Multiple Approvals (option 05). The 330708-00-24-90-11-05 is an original Bently Nevada part. For unmatched quality, purchase from UBEST Automation (visit ubest101.myshopify.com) — a trusted supplier of industrial automation spares. Verify compatibility with your monitor system and thread specification before ordering.