Bently Nevada 330104-02-21-10-01-00 3300 XL 8 mm Proximity Probe

Solving Vibration Monitoring Challenges in Rotating Machinery

When unplanned downtime strikes due to undetected shaft vibration, the Bently Nevada 330104-02-21-10-01-00 3300 XL 8 mm Proximity Probe delivers the precision measurement needed to protect critical assets. This metric probe, part of the trusted 3300 XL series, provides reliable displacement data for turbines, compressors, and pumps operating in harsh environments.

Technical Specifications Breakdown

The 330104-02-21-10-01-00 features a 1.0 meter (3.3 feet) total length with a 20 mm unthreaded length and 210 mm overall case length. Its M10x1 thread ensures secure installation, with a maximum thread engagement of 15 mm. The probe tip material is polyphenylene sulfide (PPS), and the case is made of AISI 303 or 304 stainless steel (SST). Nominal probe DC resistance from center conductor to outer conductor is 7.59 ± 0.50 ohms at 1.0 m length. The linear range is 2 mm (80 mils), starting at approximately 0.25 mm (10 mils) from the target, with a recommended gap setting for radial vibration of -9 Vdc (approximately 1.27 mm or 50 mils).

Industry Applications

In oil and gas refineries, the 330104-02-21-10-01-00 monitors shaft vibration in high-speed centrifugal compressors, helping operators detect early signs of imbalance or misalignment. Power generation facilities use this probe for turbine supervisory instrumentation, where its -52°C to +177°C operating temperature range withstands extreme conditions. The probe also excels in pulp and paper mills, providing reliable data for large motor and pump monitoring.

Installation & Setup Guidance

Field wiring requires 0.2 to 1.5 mm² (16 to 24 AWG) conductor, preferably using a 3-conductor shielded triad cable with tinned wiring. Maximum cable length between the 3300 XL Proximitor Sensor and the monitor is 305 meters (1,000 feet). For optimal performance, set the gap to -9 Vdc (approximately 1.27 mm or 50 mils) for radial vibration measurements. The probe uses a miniature coaxial ClickLoc connector with connector protector for reliable signal transmission.

Maintenance & Reliability

The probe case material—AISI 303 or 304 stainless steel—provides excellent corrosion resistance in industrial environments. The probe tip, made of polyphenylene sulfide (PPS), withstands high temperatures and chemical exposure. Exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the pressure seal, so avoid such conditions. The probe sealing material is a Viton® O-ring, designed to seal differential pressure between the tip and case. Although probes are not pressure tested before shipment, contact the custom design department if testing is required.

Compatibility & Integration

This 3300 XL probe integrates with Bently Nevada monitoring systems via the 3300 XL Proximitor Sensor. When installed with intrinsically safe zener barriers per drawing 141092 or with galvanic isolators, it meets Class I, Zone 0: AEx/Ex ia IIC T5...T1 Ga; Class 1, Groups A, B, C, and D; Class II, Groups E, F, and G; Class III requirements. For non-incendive installations per drawing 140979, it meets Class I, Zone 2: AEx/Ex nA IIC T5...T1 Gc; Class 1, Division 2, Groups A, B, C, D; Class 1, Zone 2: AEx/Ex ec II C T5...T1 Gc; Class I, Division 2, Groups A, B, C, and D.

Selection Guide & Purchasing Advice

Before ordering the 330104-02-21-10-01-00, verify the required probe length, thread type (M10x1), and connector option (miniature coaxial ClickLoc with standard cable). Ensure compatibility with your existing Bently Nevada monitoring system and Proximitor Sensor. For current availability and lifecycle status, contact plcmatrix.com—a trusted supplier of industrial automation components—to confirm stock and lead times.