330141-08-20-12-05 Bently Nevada 3300 XL 8 mm Probe

Product Overview: 330141-08-20-12-05

The Bently Nevada 330141-08-20-12-05 is a 3300 XL 8 mm probe with armor, engineered for precise eddy-current displacement measurement in rotating machinery. Its 2.0-meter total length and miniature coaxial ClickLoc connector with FluidLoc cable make it a direct-fit solution for standard 5 or 1 meter systems. The probe's nominal DC resistance of 7.88 ± 0.50 Ω ensures stable signal integrity across the measurement chain.

Because the 8 mm probe body provides a thicker encapsulation of the probe coil in molded PPS plastic, it resists physical abuse better than smaller-diameter alternatives. The AISI 303 or 304 stainless steel case further protects the sensing element in harsh industrial environments. Consequently, this probe is suitable for continuous monitoring on steam turbines, compressors, and pumps where mechanical robustness is critical.

Key Specifications and Performance Data

• Incremental Scale Factor (ISF): 7.87 V/mm (200 mV/mil) ±5% for standard 5 or 1 meter systems.
• Deviation from best fit straight line (DSL): Less than ±0.025 mm (±1 mil) at 0°C to +45°C.
• Probe tip material: Polyphenylene sulfide (PPS) for chemical and thermal stability.
• Probe case material: AISI 303 or 304 stainless steel.
• Probe weight: 323 g/m (11.4 oz).
• Operating temperature: -52°C to +177°C (-62°F to +350°F) for standard probe.

Notably, the patented TipLoc molding method creates a robust bond between probe tip and body. Meanwhile, the CableLoc design provides 330 N (75 lbf) pull strength, which prevents cable detachment during installation or machine vibration. The FluidLoc cable option additionally stops oil and other liquids from leaking through the cable interior.

Installation and System Integration

Install the 330141-08-20-12-05 with the miniature coaxial ClickLoc connector, ensuring the FluidLoc cable is routed away from sharp edges. Because the probe seals differential pressure via a Viton O-ring, verify the mounting surface is clean and free of debris before tightening. The probe is not pressure tested prior to shipment, so leak checks should follow site procedures.

For standard 5 or 1 meter systems, the ISF remains 7.87 V/mm ±5% over the 80 mil linear range from 0°C to +45°C. In contrast, standard 9 meter systems exhibit ±6.5% interchangeability error. Therefore, match the probe length to the extension cable and monitor configuration to maintain accuracy.

Reliability and Environmental Considerations

The 330141-08-20-12-05 operates reliably in high-humidity environments. Specifically, it shows less than a 3% change in Average Scale Factor when tested at 93% humidity per IEC standard 68-2-3 for up to 56 days. However, exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the pressure seal. Consequently, avoid cold-start procedures that subject the probe to such conditions.

Regular inspection of the probe tip and cable armor is recommended. Because the 8 mm probe provides optimal robustness against physical abuse, it is preferred for applications where contact or debris is likely. For extended temperature range needs, a separate ETR probe variant exists, but this model uses the standard temperature range.