Product Overview
The Bently Nevada 330191-00-33-90-05 is a 3300 XL 8 mm ETR proximity probe designed for reliable vibration and position measurement in rotating machinery. This probe features a 3/8-24 UNF thread without armor, a minimum unthreaded length of 0.0 inches, an overall case length of 3.3 inches, and a total probe length of 9.0 meters (29.5 feet). It comes with multiple agency approvals. The patented TipLoc molding method ensures a robust bond between the probe tip and body, while the CableLoc design provides 330 N (75 lbf) pull strength to secure the cable and tip. The optional FluidLoc cable prevents oil leakage through the cable interior. This model is ideal for critical machinery monitoring where durability and accuracy are essential.
Technical Specifications
The following key parameters define the performance of the Bently Nevada 330191-00-33-90-05 proximity probe:
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Power Supply: Requires -17.5 Vdc to -26 Vdc (nonincendive circuit), with consumption at 12 mA maximum. With barriers, range is -23 Vdc to -26 Vdc.
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Supply Sensitivity: Less than 2 mV change in output voltage per volt change in input voltage.
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Output Resistance: 50 Ω
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Probe Tip Material: Polyphenylene sulfide (PPS)
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Probe Case Material: AISI 303 or 304 stainless steel (SST)
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Cable Type: Standard 75Ω triaxial, FEP insulated; optional extended temperature range with PFA insulation. Available lengths: 0.5, 1, 1.5, 2, 3, 5, or 9 meters.
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Tensile Strength: 330 N (75 lbf) probe case to probe lead; 270 N (60 lbf) at probe lead to extension cable connectors.
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Connector Material: Gold-plated brass or gold-plated beryllium copper. Maximum connector torque: 0.565 N·m (5 in·lbf).
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Thread: 3/8-24 UNF, maximum engagement length 0.563 inches.
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Weight: 323 g/m (11.4 oz per meter).
Real-World Applications
Failures in rotating machinery often originate from undetected vibration or misalignment. The Bently Nevada 330191-00-33-90-05 proximity probe addresses this by providing accurate, non-contact displacement measurements. Its robust design with TipLoc and CableLoc prevents probe tip detachment and cable pull‑out, common failure modes in harsh environments. Typical applications include:
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Steam and gas turbines: Monitoring shaft vibration and thrust position to prevent catastrophic failure.
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Centrifugal compressors: Detecting rotor instability and imbalance early.
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Large motors and pumps: Ensuring reliable operation under variable loads.
Installation and Setup Guidance
Install the Bently Nevada 330191-00-33-90-05 probe by first selecting a mounting location that provides a clear line-of-sight to the target surface. The probe’s 3/8-24 UNF thread allows direct mounting into standard tapped holes. Ensure the target surface is clean and free of coatings to maintain accurate gap measurement. Use the supplied O-ring (Viton) to seal the probe case against pressure differentials. Tighten the connector to the specified maximum torque of 0.565 N·m. The probe cable is 75Ω triaxial; avoid sharp bends and secure the cable to prevent strain on the connectors. For one-meter systems, no extension cable is required. Verify that the system power supply meets the -17.5 Vdc to -26 Vdc requirement; operation above -23.5 Vdc can reduce linear range.
Maintenance and Reliability
To maximize the service life of the Bently Nevada 330191-00-33-90-05 probe, perform periodic visual inspections of the cable and connectors for wear or damage. The extension cable connectors have a maximum pull strength of 270 N; avoid exceeding this during installation or maintenance. The probe tip is encapsulated in PPS plastic and the case in stainless steel, resisting corrosion and physical abuse. The probe’s temperature classification ranges from -55°C to +232°C (T1) depending on the EPL (Ga/Gc or Dc). Regularly check that the O-ring seal remains intact to prevent fluid ingress, especially in oil‑lubricated machinery. The patented CableLoc and TipLoc features reduce the risk of cable detachment and tip loosening, thereby lowering the frequency of unexpected failures. A well-maintained probe will provide years of reliable service with minimal downtime.
Selection Guide and Purchasing Advice
When selecting the Bently Nevada 330191-00-33-90-05 probe, verify that your system’s power supply and cabling match the –17.5 Vdc to –26 Vdc requirement and that the probe length (9.0 meters) fits your installation distance. For longer distances, ensure compatible extension cables (available in 0.5, 1, 1.5, 2, 3, 5, or 9 meters) are used. Optional armor (AISI 302 or 304 SST with FEP jacket) is available for added mechanical protection. This probe is designed for pressure‑sealed applications; the Viton O-ring should be replaced if damaged. Purchase from a trusted supplier like PLC Source PRO to guarantee a new, factory‑sealed unit with a 12‑month warranty.