Description

Bently Nevada 330904-00-07-10-02-05 3300 XL NSv Proximity Probe

The Bently Nevada 330904-00-07-10-02-05 is a high-precision NSv (Narrow System vent) proximity probe belonging to the 3300 XL transducer family. This specialized sensor is engineered for applications where target surface areas are extremely small or where standard probes face side-view constraints. By utilizing a tighter magnetic field pattern, the NSv probe accurately measures static and dynamic distances between the probe tip and the observed metallic target. It is a critical component in machinery protection systems, providing essential data for radial vibration, axial position, and speed measurements. Its design specifically addresses the needs of high-speed centrifugal compressors and pumps where installation clearances are restricted.

Functional Performance and Design

This proximity probe operates as part of a non-contacting eddy current sensor system, delivering a voltage output proportional to the gap between the probe tip and the shaft. The 330904 series is built to withstand the rigors of heavy industrial environments, featuring a chemical-resistant Ryton probe tip and a stainless steel body. Because it maintains exceptional linearity and temperature stability, it ensures accurate readings even during thermal transients in turbomachinery. The assembly includes a miniature coaxial connector and a rugged cable designed for long-term immersion in oil and corrosive fluids. Consequently, it facilitates early detection of shaft instability, helping operators prevent catastrophic equipment failure through real-time vibration monitoring.

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)
• Model Number: 330904-00-07-10-02-05
• Transducer Type: 3300 XL NSv Proximity Probe
• Linear Range: 1.5 mm (60 mils) typical
• Probe Tip Diameter: 5 mm / 8 mm (System dependent)
• Operating Temperature: -51 °C to +177 °C (-60 °F to +351 °F)
• Probe Material: Polyphenylene sulfide (PPS) tip with 303 Stainless Steel body
• Connector Type: Miniature coaxial with gold-plated brass construction
• Certifications: CSA, ATEX, and IECEx (Intrinsically safe and non-incendive)
• Hazardous Area Rating: Class I, Div 1 / Zone 0 compatible
• Weight: 0.14 kg (0.31 lbs)

Frequently Asked Questions

What does the “NSv” designation signify for this probe?

NSv stands for Narrow System vent, which indicates that this probe is designed for use when target areas are smaller than the standard 8mm probe requirement or when side-wall interference is a concern.

Is this probe compatible with standard 3300 XL Proximitor sensors?

This probe must be paired specifically with an NSv Proximitor to ensure the correct calibration and linear scale factor, as standard 3300 XL Proximitors use different tuning.

Can this probe operate in high-pressure environments?

Yes, the 330904 series is designed to maintain a high-pressure seal between the tip and the probe body, making it suitable for mounting through machine casings where lubricant or process gas pressure is present.

How does the cable length affect the system calibration?

The system is calibrated for a specific total electrical length; the 330904 series must be used with the correct extension cable to maintain the 0.8% linearity accuracy across the full measurement range.